WHDF MOSCA Data

Note: for all these data, no attempt has been made to flat field the spectra, and wavelength calibration is based on the night sky emission lines. These give an rms of about 2-3Å, and stretch from 4300-8800Å. The images of the emission lines were created by subtracting each CCD frame from copies of itself shifted by +/-8 pixels in the spatial direction, then adding the result. This removes the underlying sky very effectively. The two narrow sets of sky lines on top and bottom are where the edges of the shifted spectra fall outside the original slit length. Cosmic rays have not been removed from these images, but the original spectra were cleaned (by hand) before passing to IRAF. The direct 'true' colour images are formed from B,R,I+H exposures.

Above is a typical sky spectrum.

All spectra taken with the green-250 grism. Scale about 6Å/pixel, and a FWHM on the arcs/sky lines of ~25Å

Mosca: Night 2 Mask 1 - two co-added 1hr frames

Notes: only arc taken had half the chip missing on readout. Second frame appears in sharper focus (seeing?) and certainly has a significantly lower sky.

ELGs, in order of I-band magnitude:
		#16657 ELG I=19.94 U-B = -0.50 B-R = 1.43 R-I = 1.04 I-Z = 0.34 I-H = 2.03 z~0.95 (OII)
		#14202 ELG I=20.31 U-B = -0.16 B-R = 1.40 R-I = 0.99 I-Z = 0.22 I-H = 2.00 z~0.61?? (x-corr early type) z~0.74?? (x-corr late type) (Badly contaminated above ~8000Å)
		#12403 ELG I=20.64 U-B = -0.58 B-R = 0.79 R-I = 0.70 I-Z = 0.37 I-H = 2.05 z~?? (H&K at 0.33?) (no x-corr) (known to be 0.95)
		#14688 ELG I=20.57 U-B = -0.28 B-R = 1.45 R-I = 0.92 I-Z = 0.25 I-H = 1.90 z~0.77 (OII) z=0.766 (x-corr)
		#10189 ELG I=20.69 U-B = -0.15 B-R = 1.88 R-I = 1.21 I-Z = 0.24 I-H = 2.28 z~?? (known to be 0.74)
		#14990 ELG I=20.94 U-B = -0.46 B-R = 1.15 R-I = 1.07 I-Z = 0.57 I-H = 2.27 z~0.95 (OII)
		#14205 ELG I=20.96 U-B = -0.43 B-R = 1.50 R-I = 0.83 I-Z = 0.11 I-H = 1.80 z~?? (v. weak x-corr at 0.83)
		#10685 ELG I=21.11 U-B = -0.56 B-R = 1.31 R-I = 0.91 I-Z = 0.31 I-H = 1.94 z~??
		#12412 ELG I=21.16 U-B = -0.36 B-R = 1.02 R-I = 0.77 I-Z = 0.18 I-H = 1.36 z~0.74 (OII)
		#16366 ELG I=21.36 U-B = -0.39 B-R = 0.97 R-I = 0.60 I-Z = 0.21 I-H = 1.38 z~1.15? ~1.86? (OII?, MgII?)
		#14458 ELG I=21.36 U-B = n/a B-R = 1.44 R-I = 0.71 I-Z = 0.84 I-H = n/a z~?? (peak is on 6830 sky line)
		#14996 ELG I=21.51 U-B n/a B-R = 1.28 R-I = 0.86 I-Z = 0.24 I-H = 1.86 z~0.78? (OII?)
		#4773 ELG I=21.53 U-B = -0.44 B-R = 0.64 R-I = 0.56 I-Z = 0.230 I-H = 1.15 z~0.74 (OII)
		#16946 ELG I=21.59 U-B = -0.33 B-R = 1.08 R-I = 0.61 I-Z = -0.30 I-H = 1.49 z~0.63 (OII, Hbeta, OIIIx2)
		#5992 ELG I=21.60 U-B = -0.55 B-R = 1.10 R-I = 0.73 I-Z = 0.10 I-H = 1.71 z~0.74? (OII?)
		#16097 ELG I=21.66 U-B = -0.65 B-R = 1.13 R-I = 0.78 I-Z = 0.38 I-H = 1.98 z~0.88? (OII?)
		#10698 ELG I=21.76 U-B = -0.56 B-R = 0.88 R-I = 0.91 I-Z = 0.13 I-H = 1.82 z~1.01? (OII?)
		#7952 ELG I=21.83 U-B = -0.50 B-R = 0.96 R-I = 0.96 I-Z = -0.05 I-H = 2.06 z~0.89 (OII) (known to be 0.8871)
LRGs, ordered by I-band magnitude:
		#8488 LRG I=19.87 U-B = n/a B-R = 3.23 R-I = 1.20 I-Z = 0.49 I-H = 2.14 z~0.61 (H&K) z=0.623 (x-corr early type)
		#17247 LRG I=20.12 U-B = -0.32 B-R = 2.89 R-I = 1.18 I-Z = 0.49 I-H = 2.48 z~?? (dip at ~7100Å is artifact H&K maybe around 6400Å) z~0.630 (x-corr early type)
		#15255 LRG I=20.57 U-B = n/a B-R = 2.51 R-I = 1.35 I-Z = 0.50 I-H = 2.30 z~?? z~0.74 (x-corr early type) (contamination at ~7000Å probaby obliterates H&K)
		#17253 LRG I=20.75 U-B = -0.23 B-R = 2.28 R-I = 1.27 I-Z = 0.41 I-H = 2.48 z~?? (H&K maybe around 7100Å) z~0.61/0.77 (x-corr early type)
		#9679 LRG I=20.80 U-B = -0.42 B-R = 1.76 R-I = 1.33 I-Z = 0.41 I-H = 2.44 z~??
		#8227 LRG I=20.84 U-B = n/a B-R = n/a R-I = 1.39 I-Z = 0.36 I-H = 2.35 z~0.73 (H&K) z~0.73 (x-corr early type)
		#16095 LRG I=20.94 U-B = 0.25 B-R = 2.11 R-I = 1.37 I-Z = 0.77 I-H = 2.71 z~0.45? 0.95? 0.11? (OIII? OII? Ha?)
		#16672 LRG I=20.98 U-B = -0.21 B-R = 2.11 R-I = 1.46 I-Z = 0.55 I-H = 2.26 z~??
BGALs, in order of I-band magnitude:
		#10664 BGAL I=18.63 U-B = -0.07 B-R = 1.48 R-I = 0.57 I-Z = 0.32 I-H = 1.60 z~0.21 (Halpha)
		#5324 BGAL I=18.80 U-B = 0.10 B-R = 1.20 R-I = 0.46 I-Z = 0.33 I-H = 1.41 z~0.13 (Halpha) (known to be 0.13)
		#17502 BGAL I=19.56 U-B = 0.40 B-R = 2.32 R-I = 0.75 I-Z = 0.33 I-H = 1.93 z~?? (maybe H&K at ~0.30?) (no x-corr)
		#5328 BGAL I=19.58 U-B = 0.39 B-R = 2.31 R-I = 0.73 I-Z = 0.36 I-H = 1.88 z~0.38 (H&K) (no xcorr) (known to be 0.38)
		#8480 BGAL I=19.60 U-B = -0.07 B-R = 1.62 R-I = 0.59 I-Z = 0.36 I-H = 1.59 z~0.27 (Halpha) z=0.274 (x-corr late type) (known to be 0.278)
		#8484 BGAL I=19.84 U-B = -0.12 B-R = 1.68 R-I = 0.58 I-Z = 0.32 I-H = 1.81 z~0.23? (Halpha?) (no x-corr)
		#9672 BGAL I=20.14 U-B = 0.02 B-R = 0.99 R-I = 0.40 I-Z = 0.21 I-H = 1.30 z~?? (no x-corr) (known to be 0.07)
Other objects:
		#16664 rihLRG I=21.05 U-B n/a B-R = 2.55 R-I = 1.08 I-Z = 0.48 I-H = 2.27 z~1.23? 0.66? (OII?, OIII?) (no x-corr) (known to be 0.627)

Mosca: Night 1 Mask 1 - one single 1hr frame

Notes: second frame of two - first has virtually no signal (cloud?). Images/throughput not great. There is a useable arc for this one (although we haven't used it).

		#3081 CHANDRA I=21.37 U-B = -0.99 B-R = 0.58 R-I = 0.36 I-Z = 0.31 I-H = 1.85 z~1.31 (MgII) z=1.306 (x-corr QSO)
		#9399 ELG I=19.56 U-B = 0.12 B-R = 1.83 R-I = 0.86 I-Z = 0.39 I-H = 2.32 z~1.06?, 0.53? (OII?, OIII?) (no x-corr) (contamination around 7000Å)
		#10185 ELG I=20.78 U-B = -0.03 B-R = 1.40 R-I = 0.63 I-Z = 0.10 I-H = 1.41 z~?? (no x-corr) (redshift known to be 0.193)
		#12965 ELG I=21.53 U-B = -0.81 B-R = 1.31 R-I = 1.07 I-Z = 0.33 I-H = 1.77 z~0.91 (OII)
		#12414 ELG I=21.13 U-B = 0.41 B-R = 1.96 R-I = 0.98 I-Z = 0.26 I-H = 2.19 z~0.74 (OII) (known to be 0.7408)
		#3644 ELG I=20.63 U-B = -0.06 B-R = 1.52 R-I = 0.94 I-Z = 0.26 I-H = 2.12 z~0.50? (OII at 5577Å?)
		#2777 LRG I=19.60 U-B = n/a B-R = 3.28 R-I = 1.18 I-Z = 0.47 I-H = 2.27 z~0.56? (H&K?) z=0.598 (X-corr early type)
		#780 LRG I=19.72 U-B = 0.49 B-R = 3.15 R-I = 1.21 I-Z = 0.40 I-H = 2.23 z~0.56? (H&K? OIII??) z=0.591 (x-corr early type)
		#3077 LRG I=19.96 U-B n/a B-R = 3.04 R-I = 1.19 I-Z = 0.41 I-H = 2.18 z~?? (very similar to #780?) z~0.597 (x-corr early type)
		#8499 LRG I=20.33 U-B n/a B-R n/a R-I = 1.29 I-Z = 0.51 I-H = 2.46 z~?? (no x-corr) (contaminated from 7000-7500Å)
		#7669 LRG I=20.45 U-B n/a B-R n/a R-I = 1.23 I-Z = 0.28 I-H = 2.30 z~?? (no x-corr)
		#12950 LRG I=20.38 U-B = 0.00 B-R = 2.50 R-I = 1.30 I-Z = 0.50 I-H = 2.51 z~?? (Blue end contaminated)
		#771 BGAL I=18.48 U-B = 0.48 B-R = 2.43 R-I = 0.81 I-Z = 0.32 I-H = 2.00 z=0.307 (x-corr early type)
		#9393 BGAL I=18.53 U-B = -0.08 B-R = 1.37 R-I = 0.58 I-Z = 0.32 I-H = 1.54 z~?? (no x-corr)
		#1659 BGAL I=18.89 U-B = -0.33 B-R = 1.32 R-I = 0.48 I-Z = 0.34 I-H = 1.50 z~0.29 (OII, Hbeta, OIIIx2, Halpha) z=0.288 (x-corr late-type)
		#3631 BGAL I=19.42 U-B = 0.11 B-R = 2.00 R-I = 0.81 I-Z = 0.33 I-H = 2.04 z~?? (no x-corr)

Mosca: Night 2 Mask 2 - one single 1hr frame

Notes: First frame of two - tracking lost on the second. Due to a mistake at the telescope, half the frame is missing. Images look sharp and signal good. The arc frame is not an arc!

		#14448 ELG I=21.47 U-B = -0.21 B-R = 1.38 R-I = 1.03 I-Z = 0.68 I-H = 2.38 z~0.82 (OII)
		#14438 ELG I=21.67 U-B = -0.47 B-R = 1.11 R-I = 0.61 I-Z = -0.08 I-H = 1.25 z~0.63 (OII)
		#14689 ELG I=20.82 U-B = -0.45 B-R = 1.00 R-I = 0.66 I-Z = 0.16 I-H = 1.55 z~0.77 (OII)
		#14972 ELG I=19.23 U-B = 0.25 B-R = 1.25 R-I = 0.53 I-Z = 0.23 I-H = 1.52 z~0.07 (Halpha)
		#14440 ELG I=21.84 U-B = -0.48 B-R = 1.24 R-I = 0.57 I-Z = 0.04 I-H = 1.49 z~0.51??1.03?? (OIII?? OII??)
		#8520 ELG I=21.72 U-B = -0.62 B-R = 1.10 R-I = 0.89 I-Z = 0.29 I-H = 1.52 z~0.90? 0.41? (OII? OII??+OIII?)
		#12408 LRG I=20.35 U-B n/a B-R = 3.15 R-I = 1.40 I-Z = 0.45 I-H = 2.28 z~0.74? (H&K) z=0.742 (x-corr early type) (known to be 0.742)
		#14692 LRG I=20.52 U-B = -0.22 B-R = 3.24 R-I = 1.42 I-Z = 0.42 I-H = 2.46 z~0.76? (H&K) z=0.762 (x-corr early type)
		#15254 LRG I=20.73 U-B n/a B-R = 1.48 R-I = 1.18 I-Z = 0.56 I-H = 2.17 z~?? (no x-corr)
		#10189 (see also Night 2 Mask 1) LRG I=20.69 U-B = -0.15 B-R = 1.88 R-I = 1.21 I-Z = 0.24 I-H = 2.28 z~?? (no x-corr) (known to be 0.7408)
		#7429 BGAL I=20.96 U-B = -0.51 B-R = 1.22 R-I = 0.31 I-Z = 0.16 I-H = 1.28 z~0.33 (OII, OIIIx2)
		#17242 BGAL I=20.36 U-B = -0.13 B-R = 0.99 R-I = 0.28 I-Z = 0.27 I-H = 1.35 z~0.16 (OII, OIIIx2) z=0.159 (x-corr late type)

Mosca: Night 1 Mask 2 - one single 1hr frame

Notes: only one frame taken, not analysed. Not much signal. There is a useable arc for this one (although we haven't used it).

Combined spectra from different nights/masks:

#10189 (combined Night 2 Mask 1+2) LRG I=20.69 U-B = -0.15 B-R = 1.88 R-I = 1.21 I-Z = 0.24 I-H = 2.28 z~?? z~0.68 (x-corr A0 star!) (early types give ~0.74) (known to be 0.7408)