Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 3981c Report Date: 09-May-96:19:01 Version: ********** Check-in Date: ********** 1.Proposal Title: GRAVITATIONAL LENS CANDIDATE 1208+101: PHOTOMETRY ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID QUASARS & AGN GO/DD Sub Category ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Dr. John N. Bahcall INSTITUTE FOR ADVANCED STUDY USA (609) 734-8054 DR. JOHN N. BAHCALL ------------------------------------------------------------------------------------ 7. Abstract Planetary Camera images of the high-redshift quasar 1208+101 will be obtained with several broad band filters. These observations will determine whether the colors of the three unresolved sources located within a region 0.6" are the same; if so, then the objects are likely to be gravitationally lensed images of the quasar. Only HST can provide sufficient spatial resolution to provide accurate photometry on the individual images. ------------------------------------------------------------------------------------ 8. Scientific Key Words: QUASAR, GRAVITATIONAL LENS ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 2.10 par: 0 10. Num targs pri: 1 par: 0 ------------------------------------------------------------------------------------ 11. Instruments requested: WF/PC ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 3981c PI: Dr. John N. Bahcall Proposal Title: GRAVITATIONAL LENS CANDIDATE 1208+101: PHOTOMETRY ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ John N. Bahcall INSTITUTE FOR ADVANCED STUDY USA Donald P. Schneider INSTITUTE FOR ADVANCED STUDY USA Dan Maoz INSTITUTE FOR ADVANCED STUDY USA Roger Doxsey SPACE TELESCOPE SCIENCE USA INSTITUTE George F. Hartig SPACE TELESCOPE SCIENCE USA INSTITUTE ------------------------------------------------------------------------------------ 3. Description of proposed observations. Four images of 1208+101 will be taken with the Planetary Camera. Three exposures (F555W, F702W, and F785LP) have integration times of 10 minutes; the other frame (F439W) has an exposure time of 30 minutes. ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. HST observations are required in order to resolve the three components. The image separations are too small for ground-based pictures to allow accurate photometry. ------------------------------------------------------------------------------------ 5. Description of special scheduling requirements. ------------------------------------------------------------------------------------ 7. Data reduction and analysis plans. Data reduction and analysis will be performed at both the Institute for Advanced Study and at STScI. ------------------------------------------------------------------------------------ 8. Additional comments or special requests. ------------------------------------------------------------------------------------ 10. Resources to be supplied by investigator's institution(s). Computing support and research associates will be available at both IAS and STScI as required by the science. ------------------------------------------------------------------------------------ 13. ------------------------------------------------------------------------------------ 11. Address Information Name: JOHN N. BAHCALL Category: PI Institution: INSTITUTE FOR ADVANCED STUDY Address: OLDEN LANE City: PRINCETON State: NJ Zip Code: 08540 Country: USA Telephone: (609) 734-8054 Telex (or e-mail): 837680 ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 3981c [ 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 1208+101 QUASAR RA = 12H 08M 23.7S +/- 0.1S, 1950 1 V = 17.9 +/- 0.2 DEC = +10D 11' 08.0" +/- 1" ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 3981c [ 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 1208+101 PC IMAGE ALL F555W PRE-FLASH=YES 1 600S 1 2 CYCLE 1 / 1-7 ------------------------------------------------------------------------------------------------------------------------------------ 2 1208+101 PC IMAGE ALL F702W PRE-FLASH=YES 1 300S 1 2 CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 3 1208+101 PC IMAGE ALL F702W PRE-FLASH=YES 1 300S 1 2 CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 4 1208+101 PC IMAGE ALL F785LP PRE-FLASH=YES 1 420S 1 2 CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 5 1208+101 PC IMAGE ALL F785LP PRE-FLASH=YES 1 420S 1 2 CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 6 1208+101 PC IMAGE ALL F439W PRE-FLASH=YES 1 900S 1 2 CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 7 1208+101 PC IMAGE ALL F439W PRE-FLASH=YES 1 900S 1 2 CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 3981c [ 5] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations PC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters PRE-FLASH=YES CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GO/DD ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 2.10 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category QUASARS & AGN ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements CYCLE 1 / 1-7 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F555W F702W F785LP F439W ------------------------------------------------------------------------------------------------------------------------------------ Target Names 1208+101 ------------------------------------------------------------------------------------------------------------------------------------