! File: 2269C.PROP ! Database: PEPDB ! Date: 17-FEB-1994:04:38:23 coverpage: title_1: GALAXY POPULATIONS IN INTERMEDIATE REDSHIFT CLUSTERS sci_cat: GALAXIES & CLUSTERS proposal_for: GO pi_title: DR. pi_fname: WARRICK pi_mi: J pi_lname: COUCH pi_inst: UNIVERSITY OF NEW SOUTH WALES pi_country: AUSTRALIA pi_phone: 61-2-697-4578 keywords_1: DISTANT GALAXY CLUSTERS, GALAXY EVOLUTION, GALAXY keywords_2: MORPHOLOGY hours_pri: 10.00 num_pri: 3 wf_pc: Y pi_position: PROF off_fname: J off_mi: W off_lname: STOREY off_title: HEAD OF SCHOOL off_inst: SCHOOL OF PHYSICS, UNIVERSITY OF NEW SOUTH WALES off_addr_1: P.O. BOX 1 off_city: KENSINGTON, SYDNEY off_state: NSW off_zip: 2033 off_country: AUSTRALIA off_phone: 61-2-697-4566 off_telex: AA26054 ! end of coverpage abstract: line_1: We request WF/PC time to image at high resolution the members of the line_2: rich southern cluster AC 114 at z=0.31 which we have studied extensively line_3: at the AAT using both fiber-optic spectroscopy and multi-colour photometry. line_4: Our comprehensive ground-based data has allowed us to measure precise line line_5: indices and colours for individual galaxies in this cluster and, along with line_6: data on other distant clusters, to construct a unifying picture for the various line_7: phenomena associated with the Butcher-Oemler effect whereby different galaxies line_8: are seen at different stages of star-formation activity within a simple cycle. line_9: The WF/PC data will allow us to morphologically classify galaxies at various line_10: stages in this cycle and resolve many of the questions left unanswered by the line_11: ground based data. The AAT catalogue is the largest, most complete spectroscopic line_12: and photometric data set where, by virtue of the moderate redshift, detailed line_13: information is available for all galaxies to a fixed magnitude limit. line_14: As such, our sample forms the ideal first target for HST studies of the line_15: evolution of galaxies in dense environments. ! ! end of abstract general_form_proposers: lname: ELLIS fname: RICHARD title: PROF. mi: S inst: DURHAM UNIVERSITY country: UK esa: Y ! lname: SHARPLES fname: RAY title: DR. mi: M inst: DURHAM UNIVERSITY country: UK esa: Y ! lname: COUCH fname: WARRICK title: P.I. mi: J inst: UNIVERSITY OF NEW SOUTH WALES country: AUSTRALIA esa: Y ! ! end of general_form_proposers block general_form_text: question: 3 section: 1 line_1: We propose broad-band two-colour imaging of AC 114 with line_2: WF/PC using the F555W and F814W bands. The images will be exposed line_3: to depths required to provide morphological classifications of line_4: the bursting and post-starburst galaxies identified in our line_5: R < 20 spectroscopic and photometric ground-based samples. line_6: Morphological classification will proceed via quantitative line_7: surface photometry of the images obtained in each colour line_8: (coadding where necessary to improve S/N) with the derivation line_9: of surface brightness profiles and disk/bulge ratios. The images line_10: in each band will also be combined to map each galaxy in colour line_11: and thus determine the location and extent of the blue star line_12: star-forming regions. Non-linear MEM techniques will be employed line_13: to further enhance these processes. line_15: The F555W and F814W filters represent the best compromise line_16: between a number of factors: line_18: (1) maximising throughput line_19: (2) providing an adequate colour wavelength baseline line_20: (3) ensuring adequate calibration during the first period line_21: of HST science. ! question: 4 section: 1 line_1: The largest 4-5m ground-based telescopes have been pushed line_2: to their observational limits in terms of detection, line_3: photometry and spectroscopy in investigations of the line_4: Butcher-Oemler effect. While there is now a much clearer line_5: understanding of the effect, the inability to spatially line_6: resolve the distant cluster galaxies from the ground remains line_7: the major barrier to resolving the key issues. None of the line_8: scientific objectives can be met from the ground because of line_9: atmospheric seeing limitations. Despite some progress with line_10: image enhancement techniques, such systems are not suitable for line_11: faint objects and do not reach the 0.1-0.2 arcsec resolution line_12: required for precise morphological work. ! question: 5 section: 1 line_1: Our main requirement is to obtain complete morphological line_2: information for the R<20 members in AC 114 identified and line_3: studied spectroscopically at the AAT. The R<20 limit corresponds line_4: to V < 21.0 and I < 19.3. Using z=0.3 model galaxies with r**1/4 line_5: and exponential disk profiles sampled with the present degraded line_6: PSF, we determine that a minimum of 8. 10**5 electrons above background line_7: are required for morphological studies. From the most recent WF/PC line_8: performance data we estimate that total on-source exposures of line_9: 6.0 hours in F555W and 5.8 hours in F814W on our AC 114 field are line_10: required for us to pursue our morphological study of the galaxies line_11: in this cluster. line_13: In order to correct for cosmic ray events, frame pairs are line_14: required, but to avoid charge defect problems associated line_15: with low background levels, ideally no individual sub-exposure line_16: should be less than 1 orbit. ! question: 7 section: 1 line_1: The WF/PC frames will be reduced on STARLINK using software line_2: proven for the analysis of extended galaxies line_3: (Couch and Newell 1984). All applicants have extensive line_4: experience in multicolour cluster photometry (Couch et al line_5: 1983) and in surface photometry of bright spheroidal line_6: and multi-component galaxies (Sharples, thesis). ! question: 10 section: 1 line_1: Durham University has excellent computing facilities line_2: consisting of a 5 microVAX cluster and 3 image processing line_3: workstations. There is one STARLINK programmer dedicated line_4: to 2-D image processing requirements. ! !end of general form text general_form_address: lname: COUCH fname: WARRICK mi: J title: DR. category: PI inst: UNIVERSITY OF NEW SOUTH WALES addr_1: SCHOOL OF PHYSICS addr_2: PO BOX 1 addr_3: KENSINGTON city: SYDNEY state: NS zip: 2033 country: AUSTRALIA phone: 61-2-697-4578 telex: AA26054 ! ! end of general_form_address records fixed_targets: targnum: 1 name_1: AC114 descr_1: CLUSTER OF GALAXIES; DISTANT GALAXY descr_2: CLUSTER pos_1: RA=22H 56M 00.64S +/- 0.2S, pos_2: DEC=-35D 04' 18.6" +/- 4.5" equinox: B1950 rv_or_z: Z=0.31 fluxnum_1: 1 fluxval_1: V = 21.0 +/- 0.2 fluxnum_2: 2 fluxval_2: I = 20.1 +/- 0.2 ! ! end of fixed targets ! No solar system records found ! No generic target records found exposure_logsheet: linenum: 1.000 targname: AC114 config: WFC opmode: IMAGE aperture: ALL sp_element: F555W num_exp: 1 time_per_exp: 1500S s_to_n: 760 s_to_n_time: 21740S fluxnum_1: 1 priority: 1 param_1: CR-SPLIT=NO req_1: SEQ 1-2 NO GAP; req_2: CYCLE 1 / 1-2 comment_1: MINIMUM USEFUL SUB-EXPOSURE comment_2: IS 2500S OR 1 ORBIT ! linenum: 1.500 targname: AC114 config: WFC opmode: IMAGE aperture: ALL sp_element: F555W num_exp: 9 time_per_exp: 2300S s_to_n: 760 s_to_n_time: 21740S fluxnum_1: 1 priority: 1 param_1: CR-SPLIT=NO comment_1: MINIMUM USEFUL SUB-EXPOSURE comment_2: IS 2500S OR 1 ORBIT ! linenum: 2.000 targname: AC114 config: WFC opmode: IMAGE aperture: ALL sp_element: F814W num_exp: 9 time_per_exp: 2300S s_to_n: 644 s_to_n_time: 20980S fluxnum_1: 2 priority: 2 param_1: CR-SPLIT=NO ! ! end of exposure logsheet ! No scan data records found