Astro-Ph publications list for (Roberts_T OR Roberts_Tim)

This list is automatically generated:

137 papers found:

http://arxiv.org/abs/2401.02177v1, January 2024
NGC 2403 XMM4: evidence for a super-Eddington neutron star with a possible transient pulsation
W. Luangtip, T. P. Roberts;
http://arxiv.org/abs/2311.16243v1, November 2023
On the nature of the ultraluminous X-ray source Holmberg II X-1
F. Barra, C. Pinto, M. Middleton, T. Di Salvo, D. J. Walton, A. Gúrpide, T. P. Roberts;
http://arxiv.org/abs/2311.04733v2, November 2023
The High Energy X-ray Probe (HEX-P): Studying Extreme Accretion with Ultraluminous X-ray Sources
Matteo Bachetti, Matthew J. Middleton, Ciro Pinto, Andrés Gúrpide, Dominic J. Walton, Murray Brightman, Bret Lehmer, Timothy P. Roberts, Georgios Vasilopoulos, Jason Alford, Roberta Amato, Elena Ambrosi, Lixin Dai, Hannah P. Earnshaw, Hamza El Byad, Javier A. García, Gian Luca Israel, Amruta Jaodand, Kristin Madsen, Chandreyee Maitra, Shifra Mandel, Kaya Mori, Fabio Pintore, Ken Ohsuga, Maura Pilia, Daniel Stern, George Younes, Anna Wolter;
http://arxiv.org/abs/2308.01034v1, August 2023
Digging a little deeper: characterising three new extreme ULX candidates
T. P. Roberts, D. J. Walton, A. D. A. Mackenzie, M. Heida, S. Scaringi;
http://arxiv.org/abs/2305.19491v1, May 2023
The Large Deficit of HMXB Emission from Luminous Infrared Galaxies: the Case of the Circumnuclear Starburst Ring in NGC 7552
Lacey West, Kristen Garofali, Bret D. Lehmer, Andrea Prestwich, Rafael Eufrasio, Wasutep Luangtip, Timothy P. Roberts, Andreas Zezas;
http://arxiv.org/abs/2302.03425v1, February 2023
Probing the nature of the low state in the extreme ultraluminous X-ray pulsar NGC 5907 ULX1
F. Fuerst, D. J. Walton, G. L. Israel, M. Bachetti, D. Barret, M. Brightman, H. P. Earnshaw, A. Fabian, M. Heida, M. Imbrogno, M. J. Middleton, C. Pinto, R. Salvaterra, T. P. Roberts, G. A. Rodríguez Castillo, N. Webb;
http://arxiv.org/abs/2207.12870v2, July 2022
Unveiling the disc structure in ultraluminous X-ray source NGC 55 ULX-1
F. Barra, C. Pinto, D. J. Walton, P. Kosec, A. D'Aì, T. Di Salvo, M. Del Santo, H. Earnshaw, A. C. Fabian, F. Fuerst, A. Marino, F. Pintore, A. Robba, T. P. Roberts;
http://arxiv.org/abs/2207.09447v1, July 2022
A transient ultraluminous X-ray source in NGC 55
A. Robba, C. Pinto, F. Pintore, G. Rodriguez, E. Ambrosi, F. Barra, G. Cusumano, A. D'Aì, M. Del Santo, P. Kosec, A. Marino, M. Middleton, T. Roberts, C. Salvaggio, R. Soria, A. Wolter, D. Walton;
http://arxiv.org/abs/2206.08397v1, June 2022
The variability behavior of NGC 925 ULX-3
Hannah P. Earnshaw, Murray Brightman, Fiona A. Harrison, Marianne Heida, Amruta Jaodand, Matthew J. Middleton, Timothy P. Roberts, Dominic J. Walton;
http://arxiv.org/abs/2202.06986v1, February 2022
A multi-wavelength view of distinct accretion regimes in the pulsating ultraluminous X-ray source NGC 1313 X-2
Rajath Sathyaprakash, Timothy P. Roberts, Fabien Grisè, Philip Kaaret, Elena Ambrosi, Christine Done, Jeanette C. Gladstone, Jari Kajava, Roberto Soria, Luca Zampieri;
http://arxiv.org/abs/2110.11318v1, October 2021
The impact of precession on the observed population of ULXs
Norman Khan, Matthew. J. Middleton, Grzegorz Wiktorowicz, Thomas Dauser, Timothy P. Roberts, Joern Wilms;
http://arxiv.org/abs/2110.07625v1, October 2021
A Multi-Mission Catalogue of Ultraluminous X-ray Source Candidates
D. J. Walton, A. D. A. Mackenzie, H. Gully, N. R. Patel, T. P. Roberts, H. P. Earnshaw, S. Mateos;
http://arxiv.org/abs/2108.09221v1, August 2021
The chameleon on the branches: spectral state transition and dips in NGC 247 ULX-1
A. D'Aì, C. Pinto, M. Del Santo, F. Pintore, R. Soria, A. Robba, E. Ambrosi, W. Alston, D. Barret, A. C. Fabian, F. Fürst, E. Kara, P. Kosec, M. Middleton, T. Roberts, G. Rodriguez-Castillo, D. J. Walton;
http://arxiv.org/abs/2106.04501v2, June 2021
Broadband X-ray spectral variability of the pulsing ULX NGC 1313 X-2
A. Robba, C. Pinto, D. J. Walton, R. Soria, P. Kosec, F. Pintore, T. P. Roberts, W. N. Alston, M. Middleton, G. Cusumano, H. P. Earnshaw, F. Fuerst, R. Sathyaprakash, E. Kyritsis, A. C. Fabian;
http://arxiv.org/abs/2105.04229v1, May 2021
Long-term pulse period evolution of the ultra-luminous X-ray pulsar NGC 7793 P13
F. Fuerst, D. J. Walton, M. Heida, M. Bachetti, C. Pinto, M. J. Middleton, M. Brightman, H. P. Earnshaw, D. Barret, A. C. Fabian, P. Kretschmar, K. Pottschmidt, A. Ptak, T. Roberts, D. Stern, N. Webb, J. Wilms;
http://arxiv.org/abs/2104.11164v2, April 2021
XMM-Newton campaign on the ultraluminous X-ray source NGC 247 ULX-1: outflows
C. Pinto, R. Soria, D. Walton, A. D'Ai, F. Pintore, P. Kosec, W. N. Alston, F. Fuerst, M. J. Middleton, T. P. Roberts, M. Del Santo, D. Barret, E. Ambrosi, A. Robba, H. Earnshaw, A. Fabian;
http://arxiv.org/abs/2104.11163v2, April 2021
Quasi-periodic dipping in the ultraluminous X-ray source, NGC 247 ULX-1
W. N. Alston, C. Pinto, D. Barret, A. D'Ai, M. Del Santo, H. Earnshaw, A. C. Fabian, F. Fuerst, E. Kara, P. Kosec, M. J. Middleton, M. L. Parker, F. Pintore, A. Robba, T. P. Roberts, R. Sathyaprakash, D. Walton, E. Ambrosi;
http://arxiv.org/abs/2011.08870v2, November 2020
A New Transient Ultraluminous X-ray Source in NGC 7090
D. J. Walton, M. Heida, M. Bachetti, F. Furst, M. Brightman, H. Earnshaw, P. A. Evans, A. C. Fabian, B. W. Grefenstette, F. A. Harrison, G. L. Israel, G. B. Lansbury, M. J. Middleton, S. Pike, V. Rana, T. P. Roberts, G. A. Rodriguez Castillo, R. Salvaterra, X. Song, D. Stern;
http://arxiv.org/abs/2006.02795v1, June 2020
NIR Counterparts to ULXs (III): Completing the photometric survey and selected spectroscopic results
K. M. López, M. Heida, P. G. Jonker, M. A. P. Torres, T. P. Roberts, D. J. Walton, D. -S. Moon, F. A. Harrison;
http://arxiv.org/abs/2001.08752v2, January 2020
The Ultraluminous X-ray sources population of the galaxy NGC 7456
F. Pintore, M. Marelli, R. Salvaterra, G. L. Israel, G. A. Rodríguez Castillo, P. Esposito, A. Belfiore, A. De Luca, A. Wolter, S. Mereghetti, L. Stella, M. Rigoselli, H. P. Earnshaw, C. Pinto, T. P. Roberts, D. J. Walton, F. Bernardini, F. Haberl, C. Salvaggio, A. Tiengo, L. Zampieri, M. Bachetti, M. Brightman, P. Casella, D. D'Agostino, S. Dall'Osso, F. Fuerst, F. A. Harrison, M. Mapelli, A. Papitto, M. Middleton;
http://arxiv.org/abs/2001.00642v2, January 2020
The (re)appearance of NGC 925 ULX-3, a new transient ULX
Hannah P. Earnshaw, Marianne Heida, Murray Brightman, Felix Fürst, Fiona A. Harrison, Amruta Jaodand, Matthew J. Middleton, Timothy P. Roberts, Rajath Sathyaprakash, Daniel Stern, Dominic J. Walton;
http://arxiv.org/abs/1911.09622v2, November 2019
The Unusual Broadband X-ray Spectral Variability of NGC 1313 X-1 seen with XMM$-$Newton, Chandra and NuSTAR
D. J. Walton, C. Pinto, M. Nowak, M. Bachetti, R. Sathyaprakash, E. Kara, T. P. Roberts, R. Soria, M. Brightman, C. R. Canizares, H. P. Earnshaw, F. Furst, M. Heida, M. J. Middleton, D. Stern, L. Tao, N. Webb, W. N. Alston, D. Barret, A. C. Fabian, F. A. Harrison, P. Kosec;
http://arxiv.org/abs/1911.09582v1, November 2019
Discovery of a soft X-ray lag in the Ultraluminous X-ray Source NGC 1313 X-1
E. Kara, C. Pinto, D. J. Walton, W. N. Alston, M. Bachetti, D. Barret, M. Brightman, C. R. Canizares, H. P. Earnshaw, A. C. Fabian, F. Furst, P. Kosec, M. J. Middleton, T. P. Roberts, R. Soria, L. Tao, N. A. Webb;
http://arxiv.org/abs/1911.09568v2, November 2019
XMM-Newton Campaign On Ultraluminous X-ray Source NGC 1313 X-1: Wind vs. State Variability
C. Pinto, D. J. Walton, E. Kara, M. L. Parker, R. Soria, P. Kosec, M. J. Middleton, W. N. Alston, A. C. Fabian, M. Guainazzi, T. P. Roberts, F. Fuerst, H. P. Earnshaw, R. Sathyaprakash, D. Barret;
http://arxiv.org/abs/1910.11857v1, October 2019
The Hunt for Pulsating Ultraluminous X-ray Sources
X. Song, D. J. Walton, G. B. Lansbury, P. A. Evans, A. C. Fabian, H. Earnshaw, T. P. Roberts;
http://arxiv.org/abs/1907.12814v1, July 2019
Discovery and analysis of a ULX nebula in NGC 3521
K. M. López, P. G. Jonker, M. Heida, M. A. P. Torres, T. P. Roberts, D. J. Walton, D. -S. Moon, F. A. Harrison;
http://arxiv.org/abs/1907.06439v1, July 2019
Observational limits on the X-ray emission from the bubble nebula surrounding Ho IX X-1
Rajath Sathyaprakash, Timothy P. Roberts, Magdalena M. Siwek;
http://arxiv.org/abs/1906.04791v5, June 2019
Discovery of a 2.8 s pulsar in a 2 d orbit High-Mass X-ray Binary powering the Ultraluminous X-ray source ULX-7 in M51
G. A. Rodríguez Castillo, G. L. Israel, A. Belfiore, F. Bernardini, P. Esposito, F. Pintore, A. De Luca, A. Papitto, L. Stella, A. Tiengo, L. Zampieri, M. Bachetti, M. Brightman, P. Casella, D. D'Agostino, S. Dall'Osso, H. P. Earnshaw, F. Fürst, F. Haberl, F. A. Harrison, M. Mapelli, M. Marelli, M. Middleton, C. Pinto, T. P. Roberts, R. Salvaterra, R. Turolla, D. J. Walton, A. Wolter;
http://arxiv.org/abs/1906.00640v1, June 2019
The discovery of weak coherent pulsations in the ultraluminous X-ray source NGC 1313 X-2
R. Sathyaprakash, T. P. Roberts, D. J. Walton, F. Fuerst, M. Bachetti, C. Pinto, W. N. Alston, H. P. Earnshaw, A. C. Fabian, M. J. Middleton, R. Soria;
http://arxiv.org/abs/1905.03449v2, May 2019
Discovery of a radio transient in M81
G. E. Anderson, J. C. A. Miller-Jones, M. J. Middleton, R. Soria, D. A. Swartz, R. Urquhart, N. Hurley-Walker, P. J. Hancock, R. P. Fender, P. Gandhi, S. Marko, T. P. Roberts;
http://arxiv.org/abs/1905.02731v3, May 2019
The Lense-Thirring timing-accretion plane for ULXs
M. Middleton, P. C. Fragile, A. Ingram, T. P. Roberts;
http://arxiv.org/abs/1903.06174v2, March 2019
Thermal stability of winds driven by radiation pressure in super-Eddington accretion disks
Ciro Pinto, Missagh Mehdipour, Dom J. Walton, Matthew J. Middleton, Tim P. Roberts, Andrew C. Fabian, Matteo Guainazzi, Roberto Soria, Peter Kosec, Jan-Uwe Ness;
http://arxiv.org/abs/1812.05958v1, December 2018
Searching for intermediate-mass black holes in NGC3310
Megan Argo, Joseph Coppola, Mar Mezcua, Hannah Earnshaw, Tim Roberts;
http://arxiv.org/abs/1812.04684v1, December 2018
A new, clean catalogue of extragalactic non-nuclear X-ray sources in nearby galaxies
H. P. Earnshaw, T. P. Roberts, M. J. Middleton, D. J. Walton, S. Mateos;
http://arxiv.org/abs/1805.12140v2, May 2018
A long hard-X-ray look at the dual active galactic nuclei of M51 with NuSTAR
M. Brightman, M. Baloković, M. Koss, D. M. Alexander, A. Annuar, H. Earnshaw, P. Gandhi, F. A. Harrison, A. E. Hornschemeier, B. Lehmer, M. C. Powell, A. Ptak, B. Rangelov, T. P. Roberts, D. Stern, D. J. Walton, A. Zezas;
http://arxiv.org/abs/1802.07753v1, February 2018
Searching for propeller-phase ULXs in the XMM-Newton Serendipitous Source Catalogue
H. P. Earnshaw, T. P. Roberts, R. Sathyaprakash;
http://arxiv.org/abs/1712.03526v4, December 2017
Improved performance of semiconductor laser tracking frequency gauge
D. M. Kaplan, T. J. Roberts, J. D. Phillips, R. D. Reasenberg;
http://arxiv.org/abs/1711.07497v1, November 2017
Lense-Thirring precession in ULXs as a possible means to constrain the neutron star equation-of-state
M. J. Middleton, P. C. Fragile, M. Bachetti, M. Brightman, Y-F. Jiang, W. C. G. Ho, T. P. Roberts, A. R. Ingram, T. Dauser, C. Pinto, D. J. Walton, F. Fuerst, A. C. Fabian, N. Gehrels;
http://arxiv.org/abs/1705.04235v1, May 2017
Optical and X-ray luminosity of expanding nebulae around ultraluminous X-ray sources
Magdalena Siwek, Aleksander Sadowski, Ramesh Narayan, Timothy P. Roberts, Roberto Soria;
http://arxiv.org/abs/1704.01068v1, April 2017
A Systematic Search for Near-Infrared Counterparts of Nearby Ultraluminous X-ray sources (II)
K. M. López, M. Heida, P. G. Jonker, M. A. P. Torres, T. P. Roberts, D. J. Walton, D. -S. Moon, F. A. Harrison;
http://arxiv.org/abs/1703.10728v1, March 2017
Ultraluminous X-Ray Sources
Philip Kaaret, Hua Feng, Timothy P. Roberts;
http://arxiv.org/abs/1702.00313v1, February 2017
Soft Extragalactic X-Ray Binaries at the Eddington Threshold
Hannah M. Earnshaw, Timothy P. Roberts;
http://arxiv.org/abs/1612.05569v2, December 2016
From ultraluminous X-ray sources to ultraluminous supersoft sources: NGC 55 ULX, the missing link
C. Pinto, W. Alston, R. Soria, M. J. Middleton, D. J. Walton, A. D. Sutton, A. C. Fabian, H. Earnshaw, R. Urquhart, E. Kara, T. P. Roberts;
http://arxiv.org/abs/1611.09416v1, November 2016
Crossing the Eddington limit: examining disk spectra at high accretion rates
Andrew D. Sutton, Douglas A. Swartz, Timothy P. Roberts, Matthew J. Middleton, Roberto Soria, Chris Done;
http://arxiv.org/abs/1608.05348v1, August 2016
Spitzer IRAC observations of IR excess in Holmberg IX X-1: A circumbinary disk or a variable jet?
R. P. Dudik, C. T. Berghea, T. P. Roberts, F. Grise, A. Singh, R. Pagano, L. M. Winter;
http://arxiv.org/abs/1607.07448v1, July 2016
A 78 Day X-ray Period Detected from NGC 5907 ULX1 by Swift
D. J. Walton, F. Fuerst, M. Bachetti, D. Barret, M. Brightman, A. C. Fabian, N. Gehrels, F. A. Harrison, M. Heida, M. J. Middleton, V. Rana, T. P. Roberts, D. Stern, L. Tao, N. Webb;
http://arxiv.org/abs/1605.08246v1, May 2016
The X-ray spectral evolution of the ultraluminous X-ray source Holmberg IX X-1
W. Luangtip, T. P. Roberts, C. Done;
http://arxiv.org/abs/1603.07024v1, March 2016
Keck/MOSFIRE spectroscopy of five ULX counterparts
M. Heida, P. G. Jonker, M. A. P. Torres, T. P. Roberts, D. J. Walton, D. -S. Moon, D. Stern, F. A. Harrison;
http://arxiv.org/abs/1603.05542v1, March 2016
The ultraluminous X-ray source NGC 5643 ULX1: a large stellar mass black hole accreting at super-Eddington rates?
F. Pintore, L. Zampieri, A. D. Sutton, T. P. Roberts, M. J. Middleton, J. C. Gladstone;
http://arxiv.org/abs/1512.04825v2, December 2015
A variable ULX and possible IMBH candidate in M51a
Hannah M. Earnshaw, Timothy P. Roberts, Lucy M. Heil, Mar Mezcua, Dominic J. Walton, Chris Done, Fiona A. Harrison, George B. Lansbury, Matthew J. Middleton, Andrew D. Sutton;
http://arxiv.org/abs/1510.06200v1, October 2015
ULX behaviour: the ultraluminous state, winds & interesting anomalies
T. P. Roberts, M. J. Middleton, A. D. Sutton, M. Mezcua, D. J. Walton, L. M. Heil;
http://arxiv.org/abs/1510.03853v1, October 2015
X-ray spectral residuals in NGC 5408 X-1: diffuse emission from star formation, or the signature of a super-Eddington wind?
Andrew D. Sutton, Timothy P. Roberts, Matthew J. Middleton;
http://arxiv.org/abs/1509.06760v1, September 2015
Diagnosing the accretion flow in ultraluminous X-ray sources using soft X-ray atomic features
Matthew J. Middleton, Dominic J. Walton, Andrew Fabian, Timothy P. Roberts, Lucy Heil, Ciro Pinto, Gemma Anderson, Andrew Sutton;
http://arxiv.org/abs/1509.00315v1, September 2015
Discovery of a red supergiant counterpart to RX~J004722.4-252051, a ULX in NGC 253
M. Heida, M. A. P. Torres, P. G. Jonker, M. Servillat, S. Repetto, T. P. Roberts, D. J. Walton, D. -S. Moon, F. A. Harrison;
http://arxiv.org/abs/1508.01328v1, August 2015
X-ray time lags and nonlinear variability in the ultraluminous X-ray sources NGC 5408 X-1 and NGC 6946 X-1
L. Hernández-García, S. Vaughan, T. P. Roberts, M. Middleton;
http://arxiv.org/abs/1507.07900v1, July 2015
Ultra-Luminous X-ray Sources in Haro 11 and the Role of X-ray Binaries in Feedback in Lyman-alpha Emitting Galaxies
A. H. Prestwich, F. Jackson, P. Kaaret, M. Brorby, T. P. Roberts, S. H. Saar, M. Yukita;
http://arxiv.org/abs/1503.01711v1, March 2015
The hyperluminous X-ray source candidate in IC 4320: another HLX bites the dust
Andrew D Sutton, Timothy P. Roberts, Jeanette C. Gladstone, Dominic J. Walton;
http://arxiv.org/abs/1501.04897v2, January 2015
The powerful jet of an off-nuclear intermediate-mass black hole in the spiral galaxy NGC 2276
M. Mezcua, T. P. Roberts, A. P. Lobanov, A. D. Sutton;
http://arxiv.org/abs/1412.4532v1, December 2014
A spectral-timing model for ULXs in the super-critical regime
Matthew Middleton, Lucy Heil, Fabio Pintore, Dominic Walton, Timothy Roberts;
http://arxiv.org/abs/1411.5974v1, November 2014
NuSTAR and XMM-Newton observations of the extreme ultraluminous X-ray source NGC 5907 ULX1: A Vanishing Act
D. J. Walton, F. A. Harrison, M. Bachetti, D. Barret, S. E. Boggs, F. E. Christensen, W. W. Craig, F. Fuerst, B. W. Grefenstette, C. J. Hailey, K. K. Madsen, M. J. Middleton, V. Rana, T. P. Roberts, D. Stern, A. D. Sutton, N. Webb, W. Zhang;
http://arxiv.org/abs/1410.1569v1, October 2014
A deficit of ultraluminous X-ray sources in luminous infrared galaxies
W. Luangtip, T. P. Roberts, S. Mineo, B. D. Lehmer, D. M. Alexander, F. E. Jackson, A. D. Goulding, J. L. Fischer;
http://arxiv.org/abs/1408.2375v1, August 2014
Irradiated, colour-temperature-corrected accretion discs in ultraluminous X-ray sources
Andrew D. Sutton, Chris Done, Timothy P. Roberts;
http://arxiv.org/abs/1405.1733v1, May 2014
Near-infrared counterparts of ultraluminous X-ray sources
M. Heida, P. G. Jonker, M. A. P. Torres, E. Kool, M. Servillat, T. P. Roberts, P. J. Groot, D. J. Walton, D. Moon, F. A. Harrison;
http://arxiv.org/abs/1309.5721v2, September 2013
Radio observations of extreme ULXs: revealing the most powerful ULX radio nebula ever or the jet of an intermediate-mass black hole?
M. Mezcua, T. P. Roberts, A. D. Sutton, A. P. Lobanov;
http://arxiv.org/abs/1309.3134v2, September 2013
Broad absorption features in wind-dominated ULXs?
Matthew J. Middleton, Dominic J. Walton, Timothy P. Roberts, Lucy Heil;
http://arxiv.org/abs/1308.0878v3, August 2013
Measuring Antimatter Gravity with Muonium
Daniel M. Kaplan, Derrick Mancini, Thomas J. Phillips, Thomas J. Roberts, Jeffrey Terry, Richard Gustafson, Klaus Kirch;
http://arxiv.org/abs/1307.8044v1, July 2013
The ultraluminous state revisited: fractional variability and spectral shape as diagnostics of super-Eddington accretion
Andrew D. Sutton, Timothy P. Roberts, Matthew J. Middleton;
http://arxiv.org/abs/1306.4825v1, June 2013
A bright ultraluminous X-ray source in NGC 5907
Andrew D. Sutton, Timothy P. Roberts, Jeanette C. Gladstone, Sean A. Farrell, Emma Reilly, Michael R. Goad, Neil Gehrels;
http://arxiv.org/abs/1306.2317v1, June 2013
X-ray Outflows and Super-Eddington Accretion in the Ultraluminous X-ray Source Holmberg IX X-1
D. J. Walton, J. M. Miller, F. A. Harrison, A. C. Fabian, T. P. Roberts, M. J. Middleton, R. C. Reis;
http://arxiv.org/abs/1305.0821v1, May 2013
VLT/FORS2 observations of four high-luminosity ULX candidates
M. Heida, P. G. Jonker, M. A. P. Torres, T. P. Roberts, G. Miniutti, A. C. Fabian, E. M. Ratti;
http://arxiv.org/abs/1303.1213v1, March 2013
Optical counterparts of the nearest ultraluminous X-ray sources
Jeanette C. Gladstone, Chris Copperwheat, Craig O. Heinke, Timothy P. Roberts, Taylor F. Cartwright, Andrew J. Levan, Mike R. Goad, .;
http://arxiv.org/abs/1302.6479v1, February 2013
The XMM-Newton SSC survey of the Galactic Plane
A. Nebot Gomez-Moran, C. Motch, X. Barcons, F. J. Carrera, M. T. Ceballos, M. Cropper, N. Grosso, P. Guillout, O. Herent, S. Mateos, L. Michel, J. P. Osborne, M. Pakull, F. -X. Pineau, J. P. Pye, T. P. Roberts, S. R. Rosen, A. D. Schwope, M. G. Watson, N. Webb;
http://arxiv.org/abs/1302.6203v1, February 2013
Ultra-Luminous X-Ray Sources in the Most Metal Poor Galaxies
A. H. Prestwich, M. Tsantaki, A. Zezas, F. E. Jackson, T. P. Roberts, R. Foltz, T. Linden, V. Kalogera;
http://arxiv.org/abs/1212.4698v1, December 2012
Bright radio emission from an ultraluminous stellar-mass microquasar in M31
Matthew J. Middleton, James C. A. Miller-Jones, Sera Markoff, Rob Fender, Martin Henze, Natasha Hurley-Walker, Anna M. M. Scaife, Timothy P. Roberts, Dominic Walton, John Carpenter, Jean-Pierre Macquart, Geoffrey C. Bower, Mark Gurwell, Wolfgang Pietsch, Frank Haberl, Jonathan Harris, Michael Daniel, Junayd Miah, Chris Done, John Morgan, Hugh Dickinson, Phil Charles, Vadim Burwitz, Massimo Della Valle, Michael Freyberg, Jochen Greiner, Margarita Hernanz, Dieter H. Hartmann, Despina Hatzidimitriou, Arno Riffeser, Gloria Sala, Stella Seitz, Pablo Reig, Arne Rau, Marina Orio, David Titterington, Keith Grainge;
http://arxiv.org/abs/1212.1124v1, December 2012
Chandra Observations of the Collisional Ring Galaxy NGC 922
A. H. Prestwich, J. L. Galache. T. Linden, V. Kalogara, A. Zezas, T. P. Roberts, R. Kilgard, A. Wolter, G. Trinchieri;
http://arxiv.org/abs/1210.5163v1, October 2012
A variable ultraluminous X-ray source in a globular cluster in NGC 4649
T. P. Roberts, G. Fabbiano, B. Luo, D. -W. Kim, J. Strader, M. J. Middleton, J. P. Brodie, T. Fragos, J. S. Gallagher, V. Kalogera, A. R. King, A. Zezas;
http://arxiv.org/abs/1208.4502v1, August 2012
The nature of the bright ULX X-2 in NGC3921: a Chandra position and HST candidate counterpart
P. G. Jonker, M. Heida, M. A. P. Torres, J. C. A. Miller-Jones, A. C. Fabian, E. M. Ratti, G. Miniutti, D. J. Walton, T. P. Roberts;
http://arxiv.org/abs/1206.2559v1, June 2012
A VLT VIMOS IFU study of the ionisation nebula surrounding the Supersoft X-ray Source CAL 83
Pieter Gruyters, Katrina Exter, Timothy P. Roberts, Saul Rappaport;
http://arxiv.org/abs/1203.4100v1, March 2012
The most extreme ultraluminous X-ray sources: evidence for intermediate-mass black holes?
Andrew D. Sutton, Timothy P. Roberts, Dominic J. Walton, Jeanette C. Gladstone, Amy E. Scott;
http://arxiv.org/abs/1201.3236v1, January 2012
On the nature of high X-ray luminosities in SDSS galaxies
F. E. Jackson, T. P. Roberts, D. M. Alexander, J. M. Gelbord, A. D. Goulding, M. J. Ward, J. L. Wardlow, M. G. Watson;
http://arxiv.org/abs/1201.1291v1, January 2012
Hot and Cold Galactic Gas in the NGC 2563 Galaxy Group
Jesper Rasmussen, Xue-Ning Bai, John S. Mulchaey, J. H. van Gorkom, Tesla E. Jeltema, Ann I. Zabludoff, Eric Wilcots, Paul Martini, Duane Lee, Timothy P. Roberts;
http://arxiv.org/abs/1111.1188v1, November 2011
The missing link: a low mass X-ray binary in M31 seen as an ultraluminous X-ray source
Matthew J. Middleton, Andrew D. Sutton, Timothy P. Roberts, Floyd E. Jackson, Chris Done;
http://arxiv.org/abs/1108.1105v1, August 2011
Identifying a new intermediate-polar using XMM-Newton and INTEGRAL
Matthew J. Middleton, Edward M. Cackett, Craig Shaw, Gavin Ramsay, Timothy P. Roberts, Peter J. Wheatley;
http://arxiv.org/abs/1106.3900v1, June 2011
X-ray spectral evolution in M33 X-8
Matthew J. Middleton, Andrew D. Sutton, Timothy P. Roberts;
http://arxiv.org/abs/1106.0197v1, June 2011
2XMM Ultraluminous X-Ray Source Candidates in Nearby Galaxies
D. J. Walton, T. P. Roberts, S. Mateos, V. Heard;
http://arxiv.org/abs/1104.1649v1, April 2011
Investigating the nuclear activity of barred spiral galaxies: the case of NGC 1672
L. P. Jenkins, W. N. Brandt, E. J. M. Colbert, B. Koribalski, K. D. Kuntz, A. J. Levan, R. Ojha, T. P. Roberts, M. J. Ward, A. Zezas;
http://arxiv.org/abs/1101.4859v1, January 2011
Unlocking the nature of ultraluminous X-ray sources using their X-ray spectra
Jeanette C. Gladstone, Timothy P. Roberts, Chris Done;
http://arxiv.org/abs/1101.4541v1, January 2011
Comparing Spectral Models for ULXs with NGC 4517 ULX1
D. J. Walton, J. C. Gladstone, T. P. Roberts, A. C. Fabian, M. D. Caballero-Garcia, C. Done, M. J. Middleton;
http://arxiv.org/abs/1011.4460v1, November 2010
Key results from an XMM-Newton and Chandra study of a new sample of extreme ULXs from the 2XMM catalogue
Andrew D. Sutton, Timothy P. Roberts, Dominic J. Walton;
http://arxiv.org/abs/1011.2155v1, November 2010
(No) dynamical constraints on the mass of the black hole in two ULXs
T. P. Roberts, J. C. Gladstone, A. D. Goulding, A. M. Swinbank, M. J. Ward, M. R. Goad, A. J. Levan;
http://arxiv.org/abs/1011.0598v1, November 2010
New observations of ULX supershells, and their implications
David M. Russell, Yi-Jung Yang, Jeanette C. Gladstone, Klaas Wiersema, Timothy P. Roberts;
http://arxiv.org/abs/1011.0398v1, November 2010
A Large Catalogue of Ultraluminous X-ray Source Candidates in Nearby Galaxies
D. J. Walton, J. C. Gladstone, T. P. Roberts, A. C. Fabian;
http://arxiv.org/abs/1009.4396v1, September 2010
The Hot Interstellar Medium of the Interacting Galaxy NGC 4490
A. J. Richings, G. Fabbiano, Junfeng Wang, T. P. Roberts;
http://arxiv.org/abs/1009.3943v1, September 2010
A Chandra Perspective On Galaxy-Wide X-ray Binary Emission And Its Correlation With Star Formation Rate And Stellar Mass: New Results From Luminous Infrared Galaxies
B. D. Lehmer, D. M. Alexander, F. E. Bauer, W. N. Brandt, A. D. Goulding, L. P. Jenkins, A. Ptak, T. P. Roberts;
http://arxiv.org/abs/1009.2686v1, September 2010
Challenging times: a re-analysis of NGC 5408 X-1
M. J. Middleton, T. P. Roberts, C. Done, F. E. Jackson;
http://arxiv.org/abs/1003.3643v1, March 2010
Ultraluminous X-ray Sources forming in low metallicity natal environments
L. Zampieri, M. Colpi, M. Mapelli, A. Patruno, T. P. Roberts;
http://arxiv.org/abs/0912.2906v1, December 2009
X-ray spectral variability in the ultraluminous X-ray source Holmberg IX X-1
K. Vierdayanti, C. Done, T. R. Roberts, S. Mineshige;
http://arxiv.org/abs/0909.1017v1, September 2009
Low metallicity natal environments and black hole masses in Ultraluminous X-ray Sources
L. Zampieri, T. P. Roberts;
http://arxiv.org/abs/0908.1115v2, August 2009
Evidence for a Stellar Disruption by an IMBH in an Extragalactic Globular Cluster
Jimmy A. Irwin, Thomas G. Brink, Joel N. Bregman, Timothy P. Roberts;
http://arxiv.org/abs/0905.4076v1, May 2009
The Ultraluminous State
J. C. Gladstone, T. P. Roberts, Chris Done;
http://arxiv.org/abs/0905.1265v1, May 2009
A Systematic Study of Variability in a Sample of Ultraluminous X-ray Sources
L. M. Heil, S. Vaughan, T. P. Roberts;
http://arxiv.org/abs/0904.3852v1, April 2009
The ultraluminous X-ray source population of NGC 4485/4490
J. C. Gladstone, T. P. Roberts;
http://arxiv.org/abs/0807.1547v2, July 2008
Testing the Paradigm that Ultraluminous X-ray Sources as a Class Represent Accreting Intermediate-Mass Black Holes
C. T. Berghea, K. A. Weaver, E. J. M. Colbert, T. P. Roberts;
http://arxiv.org/abs/0803.4470v1, March 2008
New Hubble Space Telescope imaging of the counterparts to six ultraluminous X-ray sources
T. P. Roberts, A. J. Levan, M. R. Goad;
http://arxiv.org/abs/0801.2356v1, January 2008
New insights into the X-ray properties of the nearby barred spiral galaxy NGC 1672
L. P. Jenkins, W. N. Brandt, E. J. M. Colbert, A. J. Levan, T. P. Roberts, M. J. Ward, A. Zezas;
http://arxiv.org/abs/0710.0402v1, October 2007
The XMM-Newton Serendipitous Survey V. Optical identification of the XMM-Newton Medium sensitivity Survey (XMS)
X. Barcons, F. J. Carrera, M. T. Ceballos, M. J. Page, J. Bussons-Gordo, A. Corral, J. Ebrero, S. Mateos, J. A. Tedds, M. G. Watson, M. Birkinshaw, T. Boller, N. Borisov, M. Bremer, G. E. Bromage, H. Brunner, A. Caccianiga, C. S. Crawford, M. S. Cropper, R. Della Ceca, P. Derry, A. C. Fabian, P. Guillout, Y. Hashimoto, G. Hasinger, B. J. M. Hassall, G. Lamer, N. S. Loaring, T. Maccacaro, K. O. Mason, R. G. McMahon, L. Mirioni, J. P. D. Mittaz, C. Motch, I. Negueruela, J. P. Osborne, F. Panessa, I. Perez-Fournon, J. P. Pye, T. P. Roberts, S. Rosen, N. Schartel, N. Schurch, A. Schwope, P. Severgnini, R. Sharp, G. C. Stewart, G. Szokoly, A. Ullan, M. J. Ward, R. S. Warwick, P. J. Wheatley, N. A. Webb, D. Worrall, W. Yuan, H. Ziaeepour;
http://arxiv.org/abs/0709.2892v1, September 2007
The Orbital Period of the Wolf-Rayet Binary IC 10 X-1; Dynamic Evidence that the Compact Object is a Black Hole
A. H. Prestwich, R. Kilgard, P. A. Crowther, S. Carpano, A. M. T. Pollock, A. Zezas, S. H. Saar, T. P. Roberts, M. J. Ward;
http://arxiv.org/abs/0706.2562v1, June 2007
X-ray observations of ultraluminous X-ray sources
T. P. Roberts;
http://arxiv.org/abs/astro-ph/0702408v1, February 2007
An XMM-Newton view of M101 - III. Diffuse X-ray emission
R. S. Warwick, L. P. Jenkins, A. M. Read, T. P. Roberts, R. A. Owen;
http://arxiv.org/abs/astro-ph/0702274v1, February 2007
Constraints on accretion in Ultraluminous X-ray Sources from Spitzer IRS observations of NGC 4485/90: Infrared diagnostic diagrams
Gerardo A. Vazquez, Ann E. Hornschemeier, Edward Colbert, Tymothy P. Roberts, Martin J. Ward, Sangeeta Malhotra;
http://arxiv.org/abs/astro-ph/0607377v1, July 2006
Chandra monitoring observations of the ultraluminous X-ray source NGC 5204 X-1
T. P. Roberts, R. E. Kilgard, R. S. Warwick, M. R. Goad, M. J. Ward;
http://arxiv.org/abs/astro-ph/0604589v1, April 2006
The X-ray properties of the dwarf Magellanic-type galaxy NGC 55
A-M. Stobbart, T. P. Roberts, R. S. Warwick;
http://arxiv.org/abs/astro-ph/0601651v1, January 2006
XMM-Newton observations of the brightest Ultraluminous X-ray sources
A-M. Stobbart, T. P. Roberts, J. Wilms;
http://arxiv.org/abs/astro-ph/0511077v1, November 2005
New insights into ultraluminous X-ray sources from deep XMM-Newton observations
T. P. Roberts, A. -M. Stobbart, M. R. Goad, R. S. Warwick, J. Wilms, P. Uttley, J. N. Reeves;
http://arxiv.org/abs/astro-ph/0510185v1, October 2005
A deep XMM-Newton observation of the ultraluminous X-ray source HoII X-1 : the case against a 1000 solar mass black hole
M. R. Goad, T. P. Roberts, J. N. Reeves, P. Uttley;
http://arxiv.org/abs/astro-ph/0505260v1, May 2005
M74 X-1 (CXOU J013651.1+154547): An Extremely Variable Ultraluminous X-Ray Source
M. I. Krauss, R. E. Kilgard, M. R. Garcia, T. P. Roberts, A. H. Prestwich;
http://arxiv.org/abs/astro-ph/0504355v1, April 2005
Discovery of multiple ultraluminous X-ray sources in the galaxy KUG 0214-057
M. G. Watson, T. P. Roberts, M. Akiyama, Y. Ueda;
http://arxiv.org/abs/astro-ph/0412521v1, December 2004
XMM-Newton EPIC observations of the ultraluminous X-ray source NGC 5204 X-1
T. P. Roberts, R. S. Warwick, M. J. Ward, M. R. Goad, L. P. Jenkins;
http://arxiv.org/abs/astro-ph/0411535v1, November 2004
An XMM-Newton view of M101 - II. Global X-ray source properties
L. P. Jenkins, T. P. Roberts, R. S. Warwick, R. E. Kilgard, M. J. Ward;
http://arxiv.org/abs/astro-ph/0411274v1, November 2004
XMM-Newton observations of the interacting galaxy pairs NGC7771/0 and NGC2342/1
L. P. Jenkins, T. P. Roberts, M. J. Ward, A. Zezas;
http://arxiv.org/abs/astro-ph/0405285v1, May 2004
XMM-Newton observations of the starburst merger galaxies NGC 3256 & NGC 3310
L. P. Jenkins, T. P. Roberts, M. J. Ward, A. Zezas;
http://arxiv.org/abs/astro-ph/0403443v1, March 2004
A dipping black-hole X-ray binary candidate in NGC 55
A-M. Stobbart, T. P. Roberts, R. S. Warwick;
http://arxiv.org/abs/astro-ph/0401306v1, January 2004
Chandra observations of five ultraluminous X-ray sources in nearby galaxies
T. P. Roberts, R. S. Warwick, M. J. Ward, M. R. Goad;
http://arxiv.org/abs/astro-ph/0312457v1, December 2003
An XMM-Newton view of M101: I. The luminous X-ray source population
L. P. Jenkins, T. P. Roberts, R. S. Warwick, R. E. Kilgard, M. J. Ward;
http://arxiv.org/abs/astro-ph/0304024v1, April 2003
Chandra reveals a black-hole X-ray binary within the ultraluminous supernova remnant MF 16
T. P. Roberts, E. J. M. Colbert;
http://arxiv.org/abs/astro-ph/0303110v1, March 2003
The unusual supernova remnant surrounding the ultraluminous X-ray source IC 342 X-1
T. P. Roberts, M. R. Goad, M. J. Ward, R. S. Warwick;
http://arxiv.org/abs/astro-ph/0208196v1, August 2002
A Chandra observation of the interacting pair of galaxies NGC 4485/NGC 4490
T. P. Roberts, R. S. Warwick, M. J. Ward, S. S. Murray;
http://arxiv.org/abs/astro-ph/0207428v1, July 2002
The optical counterpart of the ultra-luminous x-ray source NGC 5204 X-1
M. R. Goad, T. P. Roberts, C. Knigge, P. Lira;
http://arxiv.org/abs/astro-ph/0204361v1, April 2002
High-resolution X-ray imaging and spectroscopy of the core of NGC 4945 with XMM-Newton and Chandra
N. J. Schurch, T. P. Roberts, R. S. Warwick;
http://arxiv.org/abs/astro-ph/0202017v1, February 2002
The nature of ultraluminous X-ray sources in nearby galaxies
T. P. Roberts, M. R. Goad, M. J. Ward, R. S. Warwick, P. Lira;
http://arxiv.org/abs/astro-ph/0110269v2, October 2001
The XMM-Newton Serendipitous Survey. II. First results from the AXIS high galactic latitude medium sensitivity survey
X. Barcons, F. J. Carrera, M. G. Watson, R. G. McMahon, B. Aschenbach, M. J. Freyberg, K. Page, M. J. Page, T. P. Roberts, M. J. L. Turner, D. Barret, H. Brunner, M. T. Ceballos, R. Della Ceca, P. Guillout, G. Hasinger, T. Maccacaro, S. Mateos, C. Motch, I. Negueruela, J. P. Osborne, I. Perez-Fournon, A. Schwope, P. Severgnini, G. P. Szokoly, N. A. Webb, P. J. Wheatley, D. M. Worrall;
http://arxiv.org/abs/astro-ph/0105307v1, May 2001
The identification of an optical counterpart to the super-Eddington X-ray source, NGC 5204 X-1
T. P. Roberts, M. R. Goad, M. J. Ward, R. S. Warwick, P. T. O'Brien, P. Lira, A. D. P. Hands;
http://arxiv.org/abs/astro-ph/0101475v1, January 2001
Do LINER 2 galaxies harbour low-luminosity Active Galactic Nuclei?
T. P. Roberts, N. J. Schurch, R. S. Warwick;
http://arxiv.org/abs/astro-ph/0010608v1, October 2000
XMM-Newton observations of NGC 253: Resolving the emission components in the disk and nuclear area
W. Pietsch, T. P. Roberts, M. J. Freyberg, A. M. Read, K. N. Borozdin, G. Branduardi-Raymont, M. Cappi, M. Ehle, P. Ferrando, S. M. Kahn, T. J. Ponman, A. Ptak, R. E. Shirey, M. Ward;
http://arxiv.org/abs/astro-ph/0001209v1, January 2000
A ROSAT HRI survey of bright nearby galaxies
T. P. Roberts, R. S. Warwick;
http://arxiv.org/abs/astro-ph/9811377v1, November 1998
The X-ray properties of the nearby LINER galaxy, NGC 4736
T. P. Roberts, R. S. Warwick, T. Ohashi;
http://arxiv.org/abs/astro-ph/9708275v1, August 1997
Mesosphere Sodium Column Density and the Sodium Laser Guide Star Brightness
Jian Ge, J. R. P. Angel, B. D. Jacobsen, T. Roberts, T. Martinez, W. Livingston, B. McLeod, M. Lloyd-Hart, P. McGuire, R. Noyes;