Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 4126c Report Date: 09-May-96:19:14 Version: ********** Check-in Date: ********** 1.Proposal Title: SEARCH FOR EXTENDED GALACTIC HALOS (FOS 23): FUTURE-CYCLE CONTINUATION ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID QUASARS & AGN GTO/FOS 1043 Sub Category ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Ralph Bohlin SPACE TELESCOPE SCIENCE INST USA (410) 338-4804 ------------------------------------------------------------------------------------ 7. Abstract Use QSOs projected close to nearby galaxies to search for halos sufficiently extended to explain the observed statistics of QSO absorption line spectra. Different candidate galaxies have been chosen, including some known to have extended 21 cm halos, galaxies in and out of clusters, etc. Galaxies are chosen with z>0.001 where possible, so that local Lyman alpha absorption can be resolved from a galaxian column density of 2E19 of HI in our R=1200 mode. This is a UV specific problem that requires ST collecting area. A positive detection will produce a point on the rotation curve far into the galaxy halo, as well as crude information on the physical conditions of the halo gas. Each spectrum will also contain information on the gas distribution of our galaxy. ------------------------------------------------------------------------------------ 8. Scientific Key Words: GALACTIC HALOS, QUASAR ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 10.90 par: 0 10. Num targs pri: 3 par: 0 ------------------------------------------------------------------------------------ 11. Instruments requested: FOS ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 4126c PI: Ralph Bohlin Proposal Title: SEARCH FOR EXTENDED GALACTIC HALOS (FOS 23): FUTURE-CYCLE CONTINUATION ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ Edward Beaver UC, SAN DIEGO USA E. Margaret Burbidge UC, SAN DIEGO USA Bruce Margon WASHINGTON, UNIVERSITY OF USA J. Roger P. Angel ARIZONA, UNIVERSITY OF USA Frank Bartko APPLIED RESEARCH CORPORATION USA Arthur F. Davidsen JOHNS HOPKINS UNIVERSITY USA Richard J. Harms APPLIED RESEARCH CORPORATION USA Ralph Bohlin SPACE TELESCOPE SCIENCE USA INSTITUTE Holland C. Ford SPACE TELESCOPE SCIENCE USA INSTITUTE ------------------------------------------------------------------------------------ 3. Description of proposed observations. Require about 400 counts for 10% absorption lines. Scale from 19 mag and fnu~1/nu. Expose 14000S H13, 1800S H19, 720S H27. Targets chosen to have Z such that L-alpha is clear of 2E+19 cm-2 of galactic hydrogen, Cycle 3: 301-308 Cycle 9: 901-904 ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. The HST collecting area and UV sensitivity are required for this program. ------------------------------------------------------------------------------------ 5. Description of special scheduling requirements. The SV prerequisite programs for all FOS observations in this program are: Prop ID 2195 FOS Target Acquisition Tests - All observations Prop ID 1317 Int./Ext. Wavelength Offsets - 1st target Prop ID 1318 Spectral Flat Fields - 1st target Prop ID 1320 Absolute Spectrophotometry - 1st visit of bright targets ------------------------------------------------------------------------------------ 7. Data reduction and analysis plans. All absorption lines will be identified to the 2 or 3 SIGMA limits of detectability. The lines will be associated with galactic or extragalactic absorbers at given redshifts. Any residual unidentified lines shortward of the QSO Ly-ALPHA emission line are candidates for Lyman forest absorption. ------------------------------------------------------------------------------------ 8. Additional comments or special requests. This program constitutes a scientific investigation that cannot be considered viable until 7 of the 10 targets have been observed. None of the data in this program should be made public until 1 year after the program becomes viable as a whole. ------------------------------------------------------------------------------------ 9. Description of previous HST work. All GTO/FOS programs; SV/SAO observations of 3C273. Program GTO/FOS 1043 is related. ------------------------------------------------------------------------------------ 10. Resources to be supplied by investigator's institution(s). The computer facilities and research assistance for this work have been funded entirely by grants. ------------------------------------------------------------------------------------ 11. Address Information Page 3 Name: RALPH BOHLIN Category: PI Institution: SPACE TELESCOPE SCIENCE INSTITUTE Address: HOMEWOOD CAMPUS City: BALTIMORE State: MD Zip Code: 21218 Country: USA Telephone: (410) 338-4804 Telex (or e-mail): ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 4126c [ 4] ------------------------------------------------------------------------------------------------------------------------------------ 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 3C48 E,314,H,515,911 RA=01H 37M 41.30S +/- 0.3", 2000 Z=0.37 1 V=16.2 DEC=+33D 09' 34.6" +/- 0.3" ------------------------------------------------------------------------------------------------------------------------------------ 2 0318-196 E,314,H,515,911 RA=03H 20M 21.15S +/- 0.3", 2000 Z=0.104 1 V=17.5 DEC=-19D 26' 31.7" +/-0.3", PLATE-ID=S547 Comments: B-V=1.04 ------------------------------------------------------------------------------------------------------------------------------------ 3 3C245 E,314,H,515,911 RA=10H 42M 44.63S +/- 0.3", 2000 Z=1.029 1 V=17.29 DEC=+12D 03' 32.2" +/- 0.3", PLATE-ID=N490 Comments: B-V=0.46 ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 4126c [ 5] ------------------------------------------------------------------------------------------------------------------------------------ 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 ------------------------------------------------------------------------------------------------------------------------------------ 301 3C48 FOS/RD ACQ/ 4.3 MIRROR 1 10S 1 ONBOARD ACQ FOR BINARY 302 GROUP 301-304 NO GAP REQ UPDATE CYCLE 3 / 301-308 ------------------------------------------------------------------------------------------------------------------------------------ 302 3C48 FOS/RD ACQ/ 0.25X2. MIRROR 1 10S 1 ONBOARD ACQ FOR PEAK 0 303-304 SPATIAL SCAN REQ UPDATE ------------------------------------------------------------------------------------------------------------------------------------ 303 3C48 FOS/RD ACCUM 0.25X2. G270H 1 1800S 1 0 Comments: EXPOSURE TIMES FOR SCIENCE EXPOSURES IN THIS PROPOSAL MAY BE CHANGED BY UP TO +/- 20% TO INCREASE S/C EFF. ------------------------------------------------------------------------------------------------------------------------------------ 304 3C48 FOS/RD ACCUM 0.25X2. G190H 1 4200S 1 0 ------------------------------------------------------------------------------------------------------------------------------------ 305 0318-196 FOS/RD ACQ/ 4.3 MIRROR 1 33S 1 ONBOARD ACQ FOR BINARY 306 GROUP 305-308 NO GAP REQ UPDATE ------------------------------------------------------------------------------------------------------------------------------------ 306 0318-196 FOS/RD ACQ/ 0.25X2. MIRROR 1 33S 1 ONBOARD ACQ FOR PEAK 0 307-308 SPATIAL SCAN REQ UPDATE ------------------------------------------------------------------------------------------------------------------------------------ 307 0318-196 FOS/RD ACCUM 0.25X2. G270H 1 2400S 1 0 ------------------------------------------------------------------------------------------------------------------------------------ 308 0318-196 FOS/RD ACCUM 0.25X2. G190H 1 8400S 1 0 ------------------------------------------------------------------------------------------------------------------------------------ 901 3C245 FOS/RD ACQ/ 4.3 MIRROR 1 27S 1 ONBOARD ACQ FOR BINARY 902 GROUP 901-904 NO GAP REQ UPDATE CYCLE 9 / 901-904 ------------------------------------------------------------------------------------------------------------------------------------ 902 3C245 FOS/RD ACQ/ 0.25X2. MIRROR 1 27S 1 ONBOARD ACQ FOR PEAK 0 903-904 SPATIAL SCAN REQ UPDATE ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 4126c [ 6] ------------------------------------------------------------------------------------------------------------------------------------ 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 ------------------------------------------------------------------------------------------------------------------------------------ 903 3C245 FOS/RD ACCUM 0.25X2. G270H 1 1400S 1 0 ------------------------------------------------------------------------------------------------------------------------------------ 904 3C245 FOS/RD ACCUM 0.25X2. G190H 1 8000S 1 0 ------------------------------------------------------------------------------------------------------------------------------------ Scan Paramters Form Proposal ID: 4126c [ 7] ------------------------------------------------------------------------------------------------------------------------------------ Data ID: 1 Exposure Logsheet lines: 302,306,902 FGS Scan: DWELL Dwell Only: dwell points/line: 7 Seconds per dwell: 0.00 Scan width (arc-secs): 0.0000 Scan length (arc-secs): 0.4000 Angle between sides (degrees) 0.00 Number of lines: 1 Scan rate (arc-sec/sec): 0.0000 PA of first scan line (degrees) 90.000 Scan frame (CEL or S/C): S/C Length Offset (arc-sec): 0.2000 Width Offset (arc-sec): ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 4126c [ 8] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FOS/RD ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/BINARY ACQ/PEAK ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GTO/FOS ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 10.90 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category QUASARS & AGN ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ FOR 302; GROUP 301-304 NO GAP; REQ UPDATE; CYCLE 3 / 301-308 ONBOARD ACQ FOR 303-304; SPATIAL SCAN; REQ UPDATE ONBOARD ACQ FOR 306; GROUP 305-308 NO GAP; ONBOARD ACQ FOR 307-308; ONBOARD ACQ FOR 902; GROUP 901-904 NO GAP; CYCLE 9 / 901-904 ONBOARD ACQ FOR 903-904; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR G270H G190H ------------------------------------------------------------------------------------------------------------------------------------ Target Names 3C48 0318-196 3C245 ------------------------------------------------------------------------------------------------------------------------------------