• Chandra galaxy: CXOUJ215334.0+174240.

    Below: The top two rows show the Chandra source CXOUJ215334.0+174240 as seen in hard X-rays (using two different false color maps and at two different pixel scales). The upper panels have 0.5-arcsec pixels, while the lower panels are resampled to 0.25-arcsec pixels. Both sets of panels are smoothed with a 0.8-arcsec FWHM gaussian for display purposes.

    The lower three panels show the optical counterpart identified in an archival HST WFPC2 image of the field. The HST imaging is in F555W (V) and F814W (I) visual and near-infrared bands. The lower left-hand panel is a `true' color representation of the field, while the two right-hand panels show a false color view of the composite image using two different false color maps.

    In all cases the panels are 10-arcsec square with North top and East to the left. Note these images are JPEGs and the color tables will look much better if viewed with a tool other than a browser.




  • A2218 ERO WFPC2.

    Below: A real color B/V/I image of the core region of A2218 (z=0.171) taken with WFPC2/HST as an Early Release Observation after SM3a. The various blue high-z arcs are easily visible, as is the z=0.702 lensed elliptical galaxy behind the cluster. This image comprises 15 orbits of exposure in F450W, F606W and F814W and thus represents about $3M worth of data. However, overall this image does not add significantly to our understanding of the arcs in this cluster


  • A2219 WFPC2.

    Below: A F702W image of the central 2.5× 2.5 arcmin region of A2219 (z=0.225) taken with WFPC2/HST. This image has been processed with ground-based B and I exposures to provide color information on the galaxies in the field.


  • A851 WFPC2 mosaic.

    Below: A 7.5× 7.5 arcmin mosaic of A851 (z=0.41) taken with WFPC2/HST for the MORPHS program. This figure shows the raw shear field measured from the faint galaxies in the field overlayed as a vector field along with a contour plot of the X-ray emission from the cluster. The weak lensing signal suggests that the cluster is very massive.


  • A851 UFTI ``true'' color.

    Below: A true color I/K image of A851 (z=0.41) constructed from a wide-field 5x5 mosaic taken with UFTI on UKIRT in Feb/Mar 1999. The full mosaic is 7.5× 7.5 arcmin in size with an effective exposure time of 2.4ks per pointing (25 pointings) and a median seeing of 0.5 arcsec FWHM for the whole mosaic (some frames are sub-0.4 arcsec). This subsection is 5.3× 6.8 arcmin to match the size of the Keck I image (taken in collaboration with Len Cowie and Amy Barger). The core of the cluster is dominated by half-a-dozen large ellipticals (seen in the centre of the field).


    Below: A false color K image of a single pointing from the A851 UFTI mosaic. This frame is 92× 92 arcsec in size, has an exposure time of 2.4ks and seeing of ~0.45 arcsec (around 3 kpc at the cluster redshift for Ho=50/qo=0.5). Weak spiral arms are visible in the bright galaxy in the center of the frame and several of the other brighter galaxies can be easily morphologically classified as S0 or E.


    Below: A true color image of a 60 × 60 arcsec region (roughly 400 kpc across at the cluster redshift) from the A851 UFTI mosaic. The frame shows a compact clump of galaxies on the edge of the cluster which are probably being accreted onto the cluster core. The effects of dust are evident in the colours of several of the spiral galaxies in the centre of the field as well as being seen in their HST morphologies. The reddest of the three galaxies in the field centre is also detected in a deep 1.4GHz VLA radio map of the cluster suggesting that it hosts an obscured starburst. A faint, extended K source is visible to the south-west of the field centre, this is undetected in the deep R/I images giving it a very red galaxy indicating that it has I-K>6 and is thus an Extremely Red Object. This image is created from R, I and K images, taken with WFPC2/HST, LRIS/Keck and UFTI/UKIRT respectively.


  • AC114 WFPC2 ``true'' color.

    Below: False B/R images of A370 (z=0.37) constructed from the F702W exposure taken with WFPC2. The full field is 30× 30 arcsec in size and shows the original `giant' arc - A0 - an image of a lensed z=0.72 Sbc galaxy. The majority of the arc is made up of an image of a strongly-sheared region of the galaxy's disk. A fainter radial arc is also visible above the D galaxy.


  • AC114 WFPC2 ``true'' color.

    Below: False B/R images of AC114 (z=0.31) constructed from the F702W exposure taken with WFPC2. The full field is 70× 50 arcsec in size and shows at least five multiply imaged background sources at redshifts between 1 and 3. The zoomed version is more like 30× 40 arcsec. The top two images are for viewing in a browser, while the bottom two would be better illustrations.



  • Finders for MS0440+02 and A851.

    Below: F702W (R) image of MS0440+02 taken with WFPC2. The scale is in arcseconds and North is at 153 degrees (counterclockwise from positive Y). The source N1 is the spiral galaxy to the left and slightly above the central galaxy (that is almost due WEST of the central galaxy).

    Below: R-band image of A851 taken with P200. The scale is in arcseconds and North is top with East. The source H1 is the bright spiral galaxy in the centre of the field at [115,120] with a bright star directly South-West of it.

  • New NICMOS images of AC114.

    These are a 6 orbit WFPC2 F702W exposure (left) and a single orbit NICMOS/NIC-1 F160W (right) exposure of CN#88 (two merging S0/a's, center of field) and CN#87 an interacting Sb galaxy (right) with an early-type disk companion, which has a starburst spectrum. The image in the center shows a `true' color version of the field after slight smoothing. Each panel is 11×11 arcsec.

  • New WFPC2 images of AC114.

  • Links to a number of `real' color VRI images of the PSR1640+22 Keck field (see these references: galaxy counts, star counts and clustering). These are provided at two different stretches and in JPEG (0.7Mb) and TIFF (2.0Mb) formats: Hi-contrast JPG, Hi-contrast TIFF, Lo-contrast JPG, Lo-contrast TIFF. The field is 340×420 arcsec square.

    Right: R-band image of possible S2 counterpart (z=1.06?). Left: U/R `real' color image.
    Each frame is 10×10 arcsec in size.

    Left: V/I `real' color image of central galaxy in A2390 (z=0.23) constructed from deep WFPC2 images. Note the blue `jets' and several blue knots as well as the wide-spread dust. The field is 20×20 arcsec in size. Right: The V image after subtracting a scaled version of the I frame to remove the halo of the central galaxy. The blue jets and knots stand out, as does a reddened region to the North-east of the central galaxy which appears to extend across the jets (shown as white in this frame).


    Last Modified: November 6th, 1999. [Netscape 2.0]