6003( 4) - 09/22/95 14:27 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6003 Version: 4 Check-in Date: ********** 1.Proposal Title: The evolution of elliptical galaxies in distant clusters ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle Galaxies & Clusters GO 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Dr. Roberto P. Saglia Institut fuer Astronomie und Astrophysik, Muenchen CoI: Prof. Ralf Bender Institut fuer Astronomie und Astrophysik, N Muenchen CoI: Prof. Gustavo Bruzual Centro de Investigaciones di Astronomia, N Merida, Venezuela CoI: Bodo Ziegler Institut fuer Astronomie und Astrophysik, N Muenchen ------------------------------------------------------------------------------------ 6. Abstract Aim of this project is to obtain HST images in the V and R bands of elliptical galaxies in two clusters at redshifts 0.3-0.4. The photometric parameters (Re and SBe) and the color gradients of these Es will be derived. Together with spectroscopic data we collected from the ground (velocity dispersions and line strengths of Mg, Fe, H-Beta for 20 objects), this will allow us to investigate the evolution in the structure parameters of cluster Es with redshift. ------------------------------------------------------------------------------------ 6003( 4) - 09/22/95 14:27 - [ 2] Observations Description ------------------------ We will image the cluster MS1512 in the V and R bands, and Abell 370 in the R band. All of 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 percent. We will split the 1.5 hours per filter in 9 exposures of approximately 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 & Windhorst 1993, AJ 106, 455). We expect to measure R_e to 7 percent (Saglia et al. 1995, in preparation). The calibration of the images will be obtained using already secured ground based images in the V and R 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 percent accuracy of the central velocity dispersion, measurement errors on the FP zero- points should be less than the expected scatter (in Coma less than 0.06 per object, or 12 percent of the distance (see Saglia et al. 1993 MNRAS 264, 961). Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 6003( 4) - 09/22/95 14:27 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 ABELL370 CLUSTER OF GALAXIES, RA=2H 37M 19.81S +/- 0.1S, DEC=- 1950 Z=0.375 B=20.40 RICH CLUSTER 01D 47' 6.8" +/- 2" V=19.21 R=18.01 Comments: Maximum fluxes 2 GAL-CLUS- CLUSTER OF GALAXIES, RA=15H 12M 23.7S +/- 0.1S, 1950 Z=0.372 V=18.5 151422+36362 RICH CLUSTER DEC=+36D 47' 10.7" +/- 2" R=17.8 1 Comments: Maximum fluxes 6003( 4) - 09/22/95 14:27 - [ 4] Visit: 01 Visit Requirements: ORIENT 1D TO 41D On Hold Comments: Additional Comments: 3 Orbits on ABELL370, one filter Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 ABELL370 WFPC2 IMAGE WFALL- F675W CR-SPLIT=NO 1 600S POS TARG 0.0, 0.0 FIX ------------------------------------------------------------------------------------------------------------------------------------ 2 ABELL370 WFPC2 IMAGE WFALL- F675W CR-SPLIT=NO 1 600S POS TARG 0.5, 0. FIX ------------------------------------------------------------------------------------------------------------------------------------ 3 ABELL370 WFPC2 IMAGE WFALL- F675W CR-SPLIT=NO 1 400S POS TARG -0.5, 0. FIX ------------------------------------------------------------------------------------------------------------------------------------ 4 ABELL370 WFPC2 IMAGE WFALL- F675W CR-SPLIT=NO 1 700S POS TARG 0.05, -0.45 FIX ------------------------------------------------------------------------------------------------------------------------------------ 5 ABELL370 WFPC2 IMAGE WFALL- F675W CR-SPLIT=NO 1 600S POS TARG +0.55,-0.45 FIX ------------------------------------------------------------------------------------------------------------------------------------ 6 ABELL370 WFPC2 IMAGE WFALL- F675W CR-SPLIT=NO 1 700S POS TARG -0.45,-0.45 FIX ------------------------------------------------------------------------------------------------------------------------------------ 7 ABELL370 WFPC2 IMAGE WFALL- F675W CR-SPLIT=NO 1 700S POS TARG -0.025,0.475 FIX ------------------------------------------------------------------------------------------------------------------------------------ 8 ABELL370 WFPC2 IMAGE WFALL- F675W CR-SPLIT=NO 1 600S POS TARG 0.475,0.475 FIX ------------------------------------------------------------------------------------------------------------------------------------ 9 ABELL370 WFPC2 IMAGE WFALL- F675W CR-SPLIT=NO 1 700S POS TARG -0.525,+0.475 FIX ------------------------------------------------------------------------------------------------------------------------------------ 6003( 4) - 09/22/95 14:27 - [ 5] Visit: 02 Visit Requirements: ORIENT 244D TO 284D On Hold Comments: Additional Comments: 6 Orbits on MS1512, two filters Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 11 GAL-CLUS- WFPC2 IMAGE WFALL- F675W CR-SPLIT=NO 1 600S POS TARG 0,0 151422+3636 FIX 21 ------------------------------------------------------------------------------------------------------------------------------------ 12 GAL-CLUS- WFPC2 IMAGE WFALL- F675W CR-SPLIT=NO 1 600S POS TARG +0.5, 0. 151422+3636 FIX 21 ------------------------------------------------------------------------------------------------------------------------------------ 13 GAL-CLUS- WFPC2 IMAGE WFALL- F675W CR-SPLIT=NO 1 400S POS TARG -0.5, 0. 151422+3636 FIX 21 ------------------------------------------------------------------------------------------------------------------------------------ 14 GAL-CLUS- WFPC2 IMAGE WFALL- F675W CR-SPLIT=NO 1 700S POS TARG +0.05,-0.45 151422+3636 FIX 21 ------------------------------------------------------------------------------------------------------------------------------------ 15 GAL-CLUS- WFPC2 IMAGE WFALL- F675W CR-SPLIT=NO 1 700S POS TARG +0.55,-0.45 151422+3636 FIX 21 ------------------------------------------------------------------------------------------------------------------------------------ 16 GAL-CLUS- WFPC2 IMAGE WFALL- F675W CR-SPLIT=NO 1 700S POS TARG -0.45,-0.45 151422+3636 FIX 21 ------------------------------------------------------------------------------------------------------------------------------------ 17 GAL-CLUS- WFPC2 IMAGE WFALL- F675W CR-SPLIT=NO 1 700S POS TARG -0.025,0.475 151422+3636 FIX 21 ------------------------------------------------------------------------------------------------------------------------------------ 18 GAL-CLUS- WFPC2 IMAGE WFALL- F675W CR-SPLIT=NO 1 700S POS TARG 0.475,0.475 151422+3636 FIX 21 ------------------------------------------------------------------------------------------------------------------------------------ 19 GAL-CLUS- WFPC2 IMAGE WFALL- F675W CR-SPLIT=NO 1 700S POS TARG -0.525,+0.475 151422+3636 FIX 21 ------------------------------------------------------------------------------------------------------------------------------------ 21 GAL-CLUS- WFPC2 IMAGE WFALL- F555W CR-SPLIT=NO 1 700S POS TARG 0,0 151422+3636 FIX 21 ------------------------------------------------------------------------------------------------------------------------------------ 22 GAL-CLUS- WFPC2 IMAGE WFALL- F555W CR-SPLIT=NO 1 700S POS TARG 0.5,0. 151422+3636 FIX 21 ------------------------------------------------------------------------------------------------------------------------------------ 6003( 4) - 09/22/95 14:27 - [ 6] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 23 GAL-CLUS- WFPC2 IMAGE WFALL- F555W CR-SPLIT=NO 1 700S POS TARG -0.5,0. 151422+3636 FIX 21 ------------------------------------------------------------------------------------------------------------------------------------ 24 GAL-CLUS- WFPC2 IMAGE WFALL- F555W CR-SPLIT=NO 1 700S POS TARG 0.05,-0.45 151422+3636 FIX 21 ------------------------------------------------------------------------------------------------------------------------------------ 25 GAL-CLUS- WFPC2 IMAGE WFALL- F555W CR-SPLIT=NO 1 700S POS TARG +0.55,-0.45 151422+3636 FIX 21 ------------------------------------------------------------------------------------------------------------------------------------ 26 GAL-CLUS- WFPC2 IMAGE WFALL- F555W CR-SPLIT=NO 1 700S POS TARG -0.45,-0.45 151422+3636 FIX 21 ------------------------------------------------------------------------------------------------------------------------------------ 27 GAL-CLUS- WFPC2 IMAGE WFALL- F555W CR-SPLIT=NO 1 700S POS TARG -0.025,0.475 151422+3636 FIX 21 ------------------------------------------------------------------------------------------------------------------------------------ 28 GAL-CLUS- WFPC2 IMAGE WFALL- F555W CR-SPLIT=NO 1 700S POS TARG 0.475,.475 151422+3636 FIX 21 ------------------------------------------------------------------------------------------------------------------------------------ 29 GAL-CLUS- WFPC2 IMAGE WFALL- F555W CR-SPLIT=NO 1 700S POS TARG -0.525,0.475 151422+3636 FIX 21 ------------------------------------------------------------------------------------------------------------------------------------ 6003( 4) - 09/22/95 14:27 - [ 7] Summary Form for Proposal 6003 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category Galaxies & Clusters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 1D TO 41D POS TARG 0.0, 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 ORIENT 244D TO 284D POS TARG 0,0 POS TARG +0.5, 0. POS TARG +0.05,-0.45 POS TARG 0.5,0. POS TARG -0.5,0. POS TARG 0.05,-0.45 POS TARG 0.475,.475 POS TARG -0.525,0.475 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F675W F555W ------------------------------------------------------------------------------------------------------------------------------------ Target Names ABELL370 GAL-CLUS-151422+363621 ------------------------------------------------------------------------------------------------------------------------------------