! Proposal 6478, submission 1 ! PI: Dr. Roberto P. Saglia ! Received Thu Feb 8 09:20:35 EST 1996 ! From: rsaglia@eso.org ! Hubble Space Telescope Cycle 6 (1996) Phase II Proposal Template ! $Id: 6478,v 3.1 1996/02/12 15:06:37 pepsa Exp $ ! Hubble Space Telescope Cycle 6 (1996) Phase II Proposal Template ! $Id: 6478,v 3.1 1996/02/12 15:06:37 pepsa Exp $ ! ! Refer to the HST Phase II Proposal Instructions to fill this out ! ! Anything after a "!" is ignored, and may be deleted ! ! All keywords with multiple entries are comma delimited except the ! Visit_Requirements and Special_Requirements keywords which can be ! delimited with carriage returns or semi-colons, but not commas ! ! For help call your Program Coordinator: Sleiman ! Phone: 410-338-4753 , E-mail: sleiman@stsci.edu ! ! This partially completed template was generated from a Phase I proposal. ! Name of Phase I Proposal: archive-0248.saglia.prop ! Date generated: Fri Dec 22 18:12:16 EST 1995 ! Proposal_Information ! Section 4 Title: The evolution of elliptical galaxies in distant clusters Proposal_Category: GO Scientific_Category: COSMOLOGY Cycle: 6 Investigators PI_name: Dr. Roberto P. Saglia PI_Institution: Institut fuer Astronomie und Astrophysik, Muenchen CoI_Name: Prof. Dr. Ralf Bender CoI_Institution: Institut fuer Astronomie und Astrophysik, Muenchen Contact: ! Y or N (designate at most one contact) CoI_Name: Prof. Dr. Gustavo Bruzual CoI_Institution: Centro de Investigaciones de Astronomia, Merida Contact: ! Y or N (designate at most one contact) CoI_Name: Bodo Ziegler CoI_Institution: Institut fuer Astronomie und Astrophysik, Muenchen Contact: ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) 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. Questions ! Free format text (please update) Observing_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: ! Move appropriate text from Real_Time_Justification Additional_Comments: Fixed_Targets ! Section 5.1 Target_Number: 1 Target_Name: GAL-CLUS-0952+44 Alternate_Names: Description: CLUSTER OF GALAXIES, RICH CLUSTER Position: RA=9H 49M 49.50S +/- 0.1S,! Most common specification format is DEC=+44D 08' 57" +/- 2" ! RA=0H 0M 0.00S +/- 0S, ! DEC=0D 0' 0.0" +/- 0", ! PLATE-ID=0000 Equinox: 1950 RV_or_Z: Z=0.377 Flux: V=19.8, R=19.2 ! Include at least V and B-V Comments: Maximum fluxes ! This is a template for a single visit containing a single exposure ! Repeat exposure and visit blocks as needed Visits ! Section 6 Visit_Number: 1 Visit_Requirements: ! Section 7.1 ! Uncomment or copy visit level special requirements needed ! Most of these requirements (including ORIENT) will limit scheduling ! PCS MODE [Fine | Gyro] ! GUIDing TOLerance ! DROP TO GYRO IF NECESSARY [NO REACQuisition] ORIENT 250D TO 290D ! ORIENTation TO ! ORIENTation TO FROM ! ORIENTation TO FROM NOMINAL ! SAME ORIENTation AS ! CVZ ! PARallel ! SCHEDulability ! AFTER [BY [TO ]] ! AFTER ! BEFORE ! BETWEEN AND ! GROUP WITHIN