Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 4842c Report Date: 09-May-96:20:01 Version: ********** Check-in Date: ********** 1.Proposal Title: STAR FORMATION RATES IN DISTANT CLUSTER GALAXIES - CYCLE3-HIGH ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID GALAXIES & CLUSTERS AUG/FOC 2 Long Term yrs 3487 Sub Category EVOLUTION/COSMOLOGY ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Dr. Jean-michel R Deharveng LABORATOIRE ASTRONOMIE SPATI FRANCE (33) 91055917 ------------------------------------------------------------------------------------ 7. Abstract Multicolor photometry and spectroscopic redshifts are available for a complete sample of faint galaxies in the southern cluster Abell 370 at a redshift of z=0.37. Strong evidence has been found for residual star formation in the red cluster galaxies. This may reflect general evolution in the cluster ellipticals, or it could represent the final transition from infalling gas-rich systems to present-day lenticular galaxies. FOC will be used to extend the spectral energy distributions for cluster members into the far-UV providing direct measures of the proportions of young and evolved stars in a carefully selected sample of red members complete to K=17.0. ------------------------------------------------------------------------------------ 8. Scientific Key Words: EARLY-TYPE GALAXY, EVOLUTION GALAXY CLUSTER ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 1.60 par: 0 10. Num targs pri: 2 par: 0 ------------------------------------------------------------------------------------ 11. Instruments requested: FOC ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 4842c PI: Dr. Jean-michel R Deharveng Proposal Title: STAR FORMATION RATES IN DISTANT CLUSTER GALAXIES - CYCLE3-HIGH ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ Richard Ellis PHYSICS DEPARTMENT, UNIVERSITY UK X OF DURHAM Craig Mackay INSTITUTE OF ASTRONOMY, UK X CAMBRIDGE Jean-Michel Deharveng LAB FOR SPACE ASTRONOMY, FRANCE X MARSEILLE ------------------------------------------------------------------------------------ 2. Scientific Justification. Multicolor photometry and spectroscopic redshifts are available for a complete sample of faint galaxies in the southern cluster Abell 370 at a redshift of z=0.37. Strong evidence has been found for residual star formation in the red cluster galaxies. This may reflect general evolution in the cluster ellipticals, or it could represent the final transition from infalling gas-rich systems to present-day lenticular galaxies. FOC will be used to extend the spectral energy distributions for cluster members into the far-UV providing direct measures of the proportions of young and evolved stars in a carefully selected sample of red members complete to K=17.0. ------------------------------------------------------------------------------------ 3. Description of proposed observations. we aim to obtain a single exposure of each of selected early-type cluster member through the four filters F220W,F275W,F342W,F430W ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. UV astronomy cannot be performed from ground-based observatories. no UV facilities other than HST are adequate for faint galaxies. ------------------------------------------------------------------------------------ 7. Data reduction and analysis plans. will use IRAF/STSDAS on workstations ------------------------------------------------------------------------------------ 9. Description of previous HST work. GTO program 1246 ------------------------------------------------------------------------------------ 11. Address Information Name: Jean-Michel Deharveng Category: PI Institution: Laboratoire Astronomie Spatiale Address: Traverse du Siphon, Les Trois Lucs BP8-13376 MARSEILLE Cedex 12 City: Marseille State: Zip Code: Country: France Telephone: (33) 91055917 Telex (or e-mail): 420584F ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 4842c [ 3] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial |Acqui|FLX| Flux data No | Name | Description | Position |Eqnx | Vel. |Prblm|REF| | | | | | | | | ------------------------------------------------------------------------------------------------------------------------------------ 1 ABELL370- F,404,E,303 RA = 2H 37M 21.7S +/- 0.2S, 1950 Z = 0.37 1 R = 19.30 G094 DEC = -1D 48' 0.6" +/- 3" ------------------------------------------------------------------------------------------------------------------------------------ 2 ABELL370- F,404,E,303 RA = 2H 37M 22.1S +/- 0.2S, 1950 Z = 0.37 1 R = 19.73 G027 DEC = -1D 47' 32.3" +/- 3" ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 4842c [ 4] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 ABELL370- FOC/96 IMAGE 512X512 F220W 1 16M 5 1 1 CYCLE 3 / 1-8 G094 ------------------------------------------------------------------------------------------------------------------------------------ 2 ABELL370- FOC/96 IMAGE 512X512 F275W 1 16M 5 1 1 G094 ------------------------------------------------------------------------------------------------------------------------------------ 3 ABELL370- FOC/96 IMAGE 512X512 F342W 1 8M 5 1 1 G094 ------------------------------------------------------------------------------------------------------------------------------------ 4 ABELL370- FOC/96 IMAGE 512X512 F430W 1 8M 5 1 1 G094 ------------------------------------------------------------------------------------------------------------------------------------ 5 ABELL370- FOC/96 IMAGE 512X512 F220W 1 16M 5 1 1 G027 ------------------------------------------------------------------------------------------------------------------------------------ 6 ABELL370- FOC/96 IMAGE 512X512 F275W 1 16M 5 1 1 G027 ------------------------------------------------------------------------------------------------------------------------------------ 7 ABELL370- FOC/96 IMAGE 512X512 F342W 1 8M 5 1 1 G027 ------------------------------------------------------------------------------------------------------------------------------------ 8 ABELL370- FOC/96 IMAGE 512X512 F430W 1 8M 5 1 1 G027 ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 4842c [ 5] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FOC/96 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Proposal for AUG/FOC ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 1.60 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category GALAXIES & CLUSTERS ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category EVOLUTION/COSMOLOGY ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements CYCLE 3 / 1-8 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F220W F275W F342W F430W ------------------------------------------------------------------------------------------------------------------------------------ Target Names ABELL370-G094 ABELL370-G027 ------------------------------------------------------------------------------------------------------------------------------------