6478( 3) - 02/12/96 10:32 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6478 Version: 3 Check-in Date: 12-Feb-1996 10:06:39 1.Proposal Title: The evolution of elliptical galaxies in distant clusters ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle COSMOLOGY GO 6 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Dr. Roberto P. Saglia Institut fuer Astronomie und Astrophysik, Muenchen CoI: Prof. Dr. Ralf Bender Institut fuer Astronomie und Astrophysik, N Muenchen CoI: Prof. Dr. Gustavo Bruzual Centro de Investigaciones de Astronomia, N Merida CoI: Bodo Ziegler Institut fuer Astronomie und Astrophysik, N Muenchen ------------------------------------------------------------------------------------ 6. Abstract Aim of this proposal is to obtain HST images in the V, R, and I band of elliptical galaxies in the cluster CL0952+44 at redshift 0.377. The photometric parameters (Re and SBe) and the color gradients of these E's will be derived. Together with spectroscopic data we collected from the ground (velocity dispersions and line strengths of Mg, Fe, HBeta) and the HST images collected during Cycle 5 of two other clusters, this will allow us to investigate the evolution of cluster E's with redshift. ------------------------------------------------------------------------------------ 6478( 3) - 02/12/96 10:32 - [ 2] Observations Description ------------------------ We will image the cluster CL0952+44 in the V, R, and I bands. All the ellipticals of the clusters we have spectroscopic measurements of will fit on one single WFPC2 frame. We estimate that 1.5 hours exposure time per filter will allow us to reach a signal to noise ratio large enough to determine reliable color gradients out to Re, if the CCD flattening is good to 2-3%. We will split the 1.5 hours per filter in 9 exposures of 10 minutes each, fitting into 3 orbits. The multiple exposures will allow us a reliable identification of cosmic rays even at the faint end tail of the distribution (Keel and Windhorst 1993, AJ 106, 455). We expect to measure Re to 7% precision (Saglia et al. 1996, in preparation). The calibration of the images will be obtained using already secured ground based images in the V, R, I bands and the color transformations provided by the WFPC2 Instrument Handbook. The zero-points should be determined to better than 0.05 mag. In this way, given the typical 8- 10% accuracy of Sigma's, the measurement errors on the FP zero-points should be less than the expected scatter (in Coma less than 0.06 per object, or 12% of the distance, see Saglia et al. 1993a). Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 6478( 3) - 02/12/96 10:32 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 GAL-CLUS- CLUSTER OF GALAXIES, RA=9H 49M 49.50S +/- 0.1S, 1950 Z=0.377 V = 19.8 0952+44 RICH CLUSTER DEC=+44D 08' 57" +/- 2" R = 19.2 Comments: Maximum fluxes 6478( 3) - 02/12/96 10:32 - [ 4] Visit: 01 Visit Requirements: ORIENT 250D TO 290D On Hold Comments: Additional Comments: 6 Orbits on GAL-CLUS-0952+44, 6 positions with 3 filters Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GAL-CLUS- WFPC2 IMAGE WFALL- F814W CR-SPLIT=NO 1 700S POS TARG +0., 0. 0952+44 FIX ------------------------------------------------------------------------------------------------------------------------------------ 2 GAL-CLUS- WFPC2 IMAGE WFALL- F675W CR-SPLIT=NO 1 800S POS TARG +0., 0. 0952+44 FIX ------------------------------------------------------------------------------------------------------------------------------------ 3 GAL-CLUS- WFPC2 IMAGE WFALL- F555W CR-SPLIT=NO 1 800S POS TARG +0., 0. 0952+44 FIX ------------------------------------------------------------------------------------------------------------------------------------ 4 GAL-CLUS- WFPC2 IMAGE WFALL- F814W CR-SPLIT=NO 1 800S POS TARG +0.5, 0. 0952+44 FIX ------------------------------------------------------------------------------------------------------------------------------------ 5 GAL-CLUS- WFPC2 IMAGE WFALL- F675W CR-SPLIT=NO 1 800S POS TARG +0.5, 0. 0952+44 FIX ------------------------------------------------------------------------------------------------------------------------------------ 6 GAL-CLUS- WFPC2 IMAGE WFALL- F555W CR-SPLIT=NO 1 800S POS TARG +0.5, 0. 0952+44 FIX ------------------------------------------------------------------------------------------------------------------------------------ 7 GAL-CLUS- WFPC2 IMAGE WFALL- F814W CR-SPLIT=NO 1 800S POS TARG -0.5, 0. 0952+44 FIX ------------------------------------------------------------------------------------------------------------------------------------ 8 GAL-CLUS- WFPC2 IMAGE WFALL- F675W CR-SPLIT=NO 1 800S POS TARG -0.5, 0. 0952+44 FIX ------------------------------------------------------------------------------------------------------------------------------------ 9 GAL-CLUS- WFPC2 IMAGE WFALL- F555W CR-SPLIT=NO 1 800S POS TARG -0.5, 0. 0952+44 FIX ------------------------------------------------------------------------------------------------------------------------------------ 10 GAL-CLUS- WFPC2 IMAGE WFALL- F814W CR-SPLIT=NO 1 800S POS TARG +0.05, -0.45 0952+44 FIX ------------------------------------------------------------------------------------------------------------------------------------ 11 GAL-CLUS- WFPC2 IMAGE WFALL- F675W CR-SPLIT=NO 1 800S POS TARG +0.05, -0.45 0952+44 FIX ------------------------------------------------------------------------------------------------------------------------------------ 12 GAL-CLUS- WFPC2 IMAGE WFALL- F555W CR-SPLIT=NO 1 800S POS TARG +0.05, -0.45 0952+44 FIX ------------------------------------------------------------------------------------------------------------------------------------ 13 GAL-CLUS- WFPC2 IMAGE WFALL- F814W CR-SPLIT=NO 1 800S POS TARG +0.55,-0.45 0952+44 FIX ------------------------------------------------------------------------------------------------------------------------------------ 14 GAL-CLUS- WFPC2 IMAGE WFALL- F675W CR-SPLIT=NO 1 800S POS TARG +0.55,-0.45 0952+44 FIX ------------------------------------------------------------------------------------------------------------------------------------ 15 GAL-CLUS- WFPC2 IMAGE WFALL- F555W CR-SPLIT=NO 1 800S POS TARG +0.55,-0.45 0952+44 FIX ------------------------------------------------------------------------------------------------------------------------------------ 6478( 3) - 02/12/96 10:32 - [ 5] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 16 GAL-CLUS- WFPC2 IMAGE WFALL- F814W CR-SPLIT=NO 1 800S POS TARG -0.45, -0.45 0952+44 FIX ------------------------------------------------------------------------------------------------------------------------------------ 17 GAL-CLUS- WFPC2 IMAGE WFALL- F675W CR-SPLIT=NO 1 800S POS TARG -0.45, -0.45 0952+44 FIX ------------------------------------------------------------------------------------------------------------------------------------ 18 GAL-CLUS- WFPC2 IMAGE WFALL- F555W CR-SPLIT=NO 1 800S POS TARG -0.45, -0.45 0952+44 FIX ------------------------------------------------------------------------------------------------------------------------------------ 6478( 3) - 02/12/96 10:32 - [ 6] Visit: 02 Visit Requirements: ORIENT 250D TO 290D On Hold Comments: Additional Comments: 3 Orbits on GAL-CLUS-0952+44, last 3 positions Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 19 GAL-CLUS- WFPC2 IMAGE WFALL- F814W CR-SPLIT=NO 1 700S POS TARG -0.025, 0.475 0952+44 FIX ------------------------------------------------------------------------------------------------------------------------------------ 20 GAL-CLUS- WFPC2 IMAGE WFALL- F675W CR-SPLIT=NO 1 800S POS TARG -0.025, 0.475 0952+44 FIX ------------------------------------------------------------------------------------------------------------------------------------ 21 GAL-CLUS- WFPC2 IMAGE WFALL- F555W CR-SPLIT=NO 1 800S POS TARG -0.025, 0.475 0952+44 FIX ------------------------------------------------------------------------------------------------------------------------------------ 22 GAL-CLUS- WFPC2 IMAGE WFALL- F814W CR-SPLIT=NO 1 800S POS TARG 0.475, 0.475 0952+44 FIX ------------------------------------------------------------------------------------------------------------------------------------ 23 GAL-CLUS- WFPC2 IMAGE WFALL- F675W CR-SPLIT=NO 1 800S POS TARG 0.475, 0.475 0952+44 FIX ------------------------------------------------------------------------------------------------------------------------------------ 24 GAL-CLUS- WFPC2 IMAGE WFALL- F555W CR-SPLIT=NO 1 800S POS TARG 0.475, 0.475 0952+44 FIX ------------------------------------------------------------------------------------------------------------------------------------ 25 GAL-CLUS- WFPC2 IMAGE WFALL- F814W CR-SPLIT=NO 1 800S POS TARG -0.525, 0.475 0952+44 FIX ------------------------------------------------------------------------------------------------------------------------------------ 26 GAL-CLUS- WFPC2 IMAGE WFALL- F675W CR-SPLIT=NO 1 800S POS TARG -0.525, 0.475 0952+44 FIX ------------------------------------------------------------------------------------------------------------------------------------ 27 GAL-CLUS- WFPC2 IMAGE WFALL- F555W CR-SPLIT=NO 1 800S POS TARG -0.525, 0.475 0952+44 FIX ------------------------------------------------------------------------------------------------------------------------------------ 6478( 3) - 02/12/96 10:32 - [ 7] Summary Form for Proposal 6478 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category COSMOLOGY ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 250D TO 290D POS TARG +0., 0. POS TARG +0.5, 0. POS TARG -0.5, 0. POS TARG +0.05, -0.45 POS TARG +0.55,-0.45 POS TARG -0.45, -0.45 POS TARG -0.025, 0.475 POS TARG 0.475, 0.475 POS TARG -0.525, 0.475 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F814W F675W F555W ------------------------------------------------------------------------------------------------------------------------------------ Target Names GAL-CLUS-0952+44 ------------------------------------------------------------------------------------------------------------------------------------