7451( 6) - 10/06/97 16:40 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 7451 Version: 6 Check-in Date: 06-Oct-1997 16:35:59 1.Proposal Title: Gravitational Lensing by Damped Ly-Alpha Absorbers ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle QUASAR ABSORPTION LIN GO 7 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: A. SMETTE KAPTEYN ASTRONOMICAL INSTITUTE CoI: Jean-Francc ois Claeskens Institut d'Astrophysique, Universite de N Liege CoI: Jean Surdej Institut d'Astrophysique, Universite de N Liege CoI: Vincent Le Brun LAS du CNRS, Marseille N ------------------------------------------------------------------------------------ 6. Abstract Damped Ly-Alpha (DLAs) are thought to arise in the disk of the progenitors of present-day spiral galaxies. Recent surveys reveal that they contain a large fraction of the HI at high redshift, in quantities similar to the one needed to form the entire star population in the local Universe; thus the redshift evolution of the HI content of the Universe may provide clues to the evolution of the overall star formation rate. However, we recently found indications that existing surveys for z< 1 DLAs may be affected by the magnification bias due to gravitational lensing (Smette, Claeskens & Surdej 1997). On the other hand, HST images of QSOs with 0.4 < z < 1 DLAs were studied by Le Brun et al. (1996): several of them lie at impact parameter similar to the Einstein radius of the absorber, as derived from its luminosity. We thus expect that some of these QSOs be multiply imaged by their absorbers, but with a secondary image possibly severely absorbed by dust located in the galaxy. We suggest a search for possible secondary images due to gravitational lensing by the galaxy responsible of the absorption; we therefore propose to obtain IR images with NICMOS of 13 quasars in the spectrum of which DLAs, 21 cm or strong MgII absorption lines have been detected. As multiple images offer a direct mean of measuring the mass of the lens, HST would thus directly determine the mass associated with DLA absorbers and test the dark matter hypothesis for spiral galaxies in a way which do not rely on their dynamical properties. ------------------------------------------------------------------------------------ 7451( 6) - 10/06/97 16:40 - [ 2] Observations Description ------------------------ In order to keep the best of the resolution available with HST, while still not being affected by extinction, we choosed to work with the Camera 1 and the F160W filter. The V magnitude of the QSOs were obtained thanks to the Veron- Cetty & Veron Catalogue (7th Edition); the values were transformed in Jansky thanks to the online converter. In some cases, ground based photometry in the H band is available, which was then used for the calculations.We assumed a power- law of the form f(nu) \\\\\\\\propto nu^-1. As any secondary image may appear very close to the (main) image of the quasar, the PSF needs to be well characterized. The first requirement is thus to avoid saturation, as it leaves a persistent image. Taking a flux larger by a factor of 4 of the one expected for the quasar, to prevent surprises from possible variation of its luminosity, we have then computed the maximal exposure time of individual exposures with the the exposure time calculator. The exposure is then repeated as many times as possible using a spiral dithering pattern with a offset of 3 arcsecs between exposures. When possible, the dithering pattern is repeated with a slightly different orientation, which provides a better distribution of the PSF centroids on their respective pixels. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: DAT Blocking Factor: 10 Ship To: PI_Address Ship Via: Email: ------------------------------------------------------------------------------------ 7451( 6) - 10/06/97 16:40 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 PG0117+213 GALAXY,QSO RA=01H 20M 17.3S +/- J2000 Z = V = 16.1+/-0.5 0.3",DEC=21D 33' 47" +/- 1.500 F(16500)=2.05+/-0.07e-16 0.3",PLATE-ID=021K 2 PHL1226 GALAXY,QSO RA=01H 54M 27.95S +/- J2000 Z = V = 17.9+/-0.5 0.3",DEC=04D 48' 17.77" +/- 0.404 0.3",PLATE-ID=04YF 3 PKS0420-01 GALAXY,QUASAR RA=04H 23M 15.76S +/- 0.3",DEC=- J2000 Z = V = 17.0+/-0.5 01D 20' 34.06" +/- 0.3",PLATE- 0.915 F(16500)=2.0+/-0.1e-16 ID=02C9 4 PKS0454+039 GALAXY,Quasar RA=04H 56M 47.17S +/- J2000 Z = V = 16.5+/-0.5 0.3",DEC=04D 0' 52.98" +/- 1.349 0.3",PLATE-ID=02V3 5 3C196 GALAXY,Quasar RA=08H 13M 36.06S +/- J2000 Z = V = 17.8+/-0.5 0.3",DEC=48D 13' 2.50" +/- 0.871 0.3",PLATE-ID=02HE 6 Q1209+1046 GALAXY,QSO RA=12H 11M 40.64S +/- J2000 Z = V = 17.8+/-0.5 0.3",DEC=10D 30' 2.44" +/- 2.193 0.3",PLATE-ID=01TJ 7 PG1247+268 GALAXY,QSO RA=12H 50M 5.73S +/- J2000 Z = V = 15.6+/-0.5 0.3",DEC=26D 31' 7.55" +/- 2.043 0.3",PLATE-ID=01PM 8 3C286 GALAXY,Quasar RA=13H 31M 8.29S +/- J2000 Z = V = 17.25+/-0.5 0.3",DEC=30D 30' 32.70" +/- 0.846 0.3",PLATE-ID=009L 9 PG1329+412 GALAXY,QSO RA=13H 31M 41.14S +/- J2000 Z = V = 17.2+/-0.5 0.3",DEC=41D 1' 58.66" +/- 1.937 0.3",PLATE-ID=00XY 10 PB3977 GALAXY,Quasar RA=13H 33M 35.78S +/- J2000 Z = V = 16.71+/-0.5 0.3",DEC=16D 49' 3.73" +/- 2.084 0.3",PLATE-ID=01TF 11 3C336 GALAXY,Quasar RA=16H 24M 39.09S +/- J2000 Z = V = 17.47+/-0.5 0.3",DEC=23D 45' 12.48" +/- 0.927 0.3",PLATE-ID=02BA 12 PG2112+059 GALAXY,QSO RA=21H 14M 52.58S +/- J2000 Z = V = 15.77+/-0.5 0.3",DEC=06D 7' 42.90" +/- 0.457 0.3",PLATE-ID=02V8 13 3C446 GALAXY,QUASAR RA=22H 25M 47.31S +/- 0.3",DEC=- J2000 Z = V = 18.4+/-0.5 04D 57' 1.41" +/- 0.3",PLATE- 1.404 F(16500)=6.60+/-0.5e-16 ID=02O6 F(22000)=5.0+/-0.5e-16 7451( 6) - 10/06/97 16:40 - [ 4] Visit: 01 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 PG0117+213 NIC1 MULTIAC NIC1 F160W SAMP-SEQ=STEP8,NSAMP=14, 1 DEF CUM PATTERN=SPIRAL-DITH,NUM-POS=9, DITH-SIZE=3,PATTERN-ORIENT=25, OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 2 PG0117+213 NIC1 MULTIAC NIC1 F160W SAMP-SEQ=STEP8,NSAMP=14, 1 DEF CUM PATTERN=SPIRAL-DITH,NUM-POS=5, DITH-SIZE=3,PATTERN-ORIENT=26, OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 3 PG0117+213 NIC1 MULTIAC NIC1 F160W SAMP-SEQ=STEP8,NSAMP=14, 1 DEF CUM PATTERN=SPIRAL-DITH,NUM-POS=5, DITH-SIZE=3,PATTERN-ORIENT=27, OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 7451( 6) - 10/06/97 16:40 - [ 5] Visit: 02 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 PHL1226 NIC1 MULTIAC NIC1 F160W SAMP-SEQ=STEP16,NSAMP=16, 1 DEF CUM PATTERN=SPIRAL-DITH,NUM-POS=6, DITH-SIZE=3,PATTERN-ORIENT=25, OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 2 PHL1226 NIC1 MULTIAC NIC1 F160W SAMP-SEQ=STEP16,NSAMP=16, 1 DEF CUM PATTERN=SPIRAL-DITH,NUM-POS=6, DITH-SIZE=3,PATTERN-ORIENT=26, OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 7451( 6) - 10/06/97 16:40 - [ 6] Visit: 03 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 PKS0420-01 NIC1 MULTIAC NIC1 F160W SAMP-SEQ=STEP16,NSAMP=16, 1 DEF CUM PATTERN=SPIRAL-DITH,NUM-POS=6, DITH-SIZE=3,PATTERN-ORIENT=25, OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 2 PKS0420-01 NIC1 MULTIAC NIC1 F160W SAMP-SEQ=STEP16,NSAMP=16, 1 DEF CUM PATTERN=SPIRAL-DITH,NUM-POS=6, DITH-SIZE=3,PATTERN-ORIENT=26, OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 7451( 6) - 10/06/97 16:40 - [ 7] Visit: 04 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 PKS0454+039 NIC1 MULTIAC NIC1 F160W SAMP-SEQ=STEP16,NSAMP=16, 1 DEF CUM PATTERN=SPIRAL-DITH,NUM-POS=6, DITH-SIZE=3,PATTERN-ORIENT=25, OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 2 PKS0454+039 NIC1 MULTIAC NIC1 F160W SAMP-SEQ=STEP16,NSAMP=16, 1 DEF CUM PATTERN=SPIRAL-DITH,NUM-POS=6, DITH-SIZE=3,PATTERN-ORIENT=26, OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 7451( 6) - 10/06/97 16:40 - [ 8] Visit: 05 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 3C196 NIC1 MULTIAC NIC1 F160W SAMP-SEQ=STEP32,NSAMP=17, 1 DEF CUM PATTERN=SPIRAL-DITH,NUM-POS=7, DITH-SIZE=1,PATTERN-ORIENT=25, OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 7451( 6) - 10/06/97 16:40 - [ 9] Visit: 06 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 Q1209+1046 NIC1 MULTIAC NIC1 F160W SAMP-SEQ=STEP32,NSAMP=17, 1 DEF CUM PATTERN=SPIRAL-DITH,NUM-POS=7, DITH-SIZE=1,PATTERN-ORIENT=25, OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 7451( 6) - 10/06/97 16:40 - [ 10] Visit: 07 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 PG1247+268 NIC1 MULTIAC NIC1 F160W SAMP-SEQ=STEP8,NSAMP=11, 1 DEF CUM PATTERN=SPIRAL-DITH,NUM-POS=9, DITH-SIZE=1,PATTERN-ORIENT=25, OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 2 PG1247+268 NIC1 MULTIAC NIC1 F160W SAMP-SEQ=STEP8,NSAMP=11, 1 DEF CUM PATTERN=SPIRAL-DITH,NUM-POS=9, DITH-SIZE=1,PATTERN-ORIENT=26, OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 3 PG1247+268 NIC1 MULTIAC NIC1 F160W SAMP-SEQ=STEP8,NSAMP=11, 1 DEF CUM PATTERN=SPIRAL-DITH,NUM-POS=6, DITH-SIZE=1,PATTERN-ORIENT=27, OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 7451( 6) - 10/06/97 16:40 - [ 11] Visit: 08 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 3C286 NIC1 MULTIAC NIC1 F160W SAMP-SEQ=STEP8,NSAMP=24, 1 DEF CUM PATTERN=SPIRAL-DITH,NUM-POS=9, DITH-SIZE=1,PATTERN-ORIENT=25, OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 2 3C286 NIC1 MULTIAC NIC1 F160W SAMP-SEQ=STEP8,NSAMP=24, 1 DEF CUM PATTERN=SPIRAL-DITH,NUM-POS=3, DITH-SIZE=1,PATTERN-ORIENT=26, OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 7451( 6) - 10/06/97 16:40 - [ 12] Visit: 09 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 PG1329+412 NIC1 MULTIAC NIC1 F160W SAMP-SEQ=STEP8,NSAMP=24, 1 DEF CUM PATTERN=SPIRAL-DITH,NUM-POS=9, DITH-SIZE=3,PATTERN-ORIENT=25, OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 2 PG1329+412 NIC1 MULTIAC NIC1 F160W SAMP-SEQ=STEP8,NSAMP=24, 1 DEF CUM PATTERN=SPIRAL-DITH,NUM-POS=3, DITH-SIZE=3,PATTERN-ORIENT=26, OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 7451( 6) - 10/06/97 16:40 - [ 13] Visit: 10 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 PB3977 NIC1 MULTIAC NIC1 F160W SAMP-SEQ=STEP8,NSAMP=18, 1 DEF CUM PATTERN=SPIRAL-DITH,NUM-POS=8, DITH-SIZE=1,PATTERN-ORIENT=25, OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 2 PB3977 NIC1 MULTIAC NIC1 F160W SAMP-SEQ=STEP8,NSAMP=18, 1 DEF CUM PATTERN=SPIRAL-DITH,NUM-POS=7, DITH-SIZE=1,PATTERN-ORIENT=26, OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 7451( 6) - 10/06/97 16:40 - [ 14] Visit: 11 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 3C336 NIC1 MULTIAC NIC1 F160W SAMP-SEQ=STEP16,NSAMP=20, 1 DEF CUM PATTERN=SPIRAL-DITH,NUM-POS=9, DITH-SIZE=3,PATTERN-ORIENT=25, OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 7451( 6) - 10/06/97 16:40 - [ 15] Visit: 12 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 PG2112+059 NIC1 MULTIAC NIC1 F160W SAMP-SEQ=STEP8,NSAMP=11, 1 DEF CUM PATTERN=SPIRAL-DITH,NUM-POS=9, DITH-SIZE=1,PATTERN-ORIENT=25, OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 2 PG2112+059 NIC1 MULTIAC NIC1 F160W SAMP-SEQ=STEP8,NSAMP=11, 1 DEF CUM PATTERN=SPIRAL-DITH,NUM-POS=9, DITH-SIZE=1,PATTERN-ORIENT=26, OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 3 PG2112+059 NIC1 MULTIAC NIC1 F160W SAMP-SEQ=STEP8,NSAMP=11, 1 DEF CUM PATTERN=SPIRAL-DITH,NUM-POS=6, DITH-SIZE=1,PATTERN-ORIENT=26, OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 7451( 6) - 10/06/97 16:40 - [ 16] Visit: 13 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 3C446 NIC1 MULTIAC NIC1 F160W SAMP-SEQ=STEP8,NSAMP=11, 1 DEF CUM PATTERN=SPIRAL-DITH,NUM-POS=9, DITH-SIZE=1,PATTERN-ORIENT=25, OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 2 3C446 NIC1 MULTIAC NIC1 F160W SAMP-SEQ=STEP8,NSAMP=11, 1 DEF CUM PATTERN=SPIRAL-DITH,NUM-POS=9, DITH-SIZE=1,PATTERN-ORIENT=26, OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 3 3C446 NIC1 MULTIAC NIC1 F160W SAMP-SEQ=STEP8,NSAMP=11, 1 DEF CUM PATTERN=SPIRAL-DITH,NUM-POS=6, DITH-SIZE=1,PATTERN-ORIENT=26, OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 7451( 6) - 10/06/97 16:40 - [ 17] Summary Form for Proposal 7451 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations NIC1 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SAMP-SEQ=STEP8 NSAMP=14 PATTERN=SPIRAL-DITH NUM-POS=9 DITH-SIZE=3 PATTERN-ORIENT=25 OFFSET=SAM PATTERN-ORIENT=26 PATTERN-ORIENT=27 NUM-POS=6 NSAMP=16 SAMP-SEQ=STEP16 DITH-SIZE=1 NUM-POS=7 NSAMP=11 NSAMP=24 NUM-POS=3 NUM-POS=8 NSAMP=18 NSAMP=20 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category QUASAR ABSORPTION LINES ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F160W ------------------------------------------------------------------------------------------------------------------------------------ Target Names PG0117+213 PHL1226 PKS0420-01 PKS0454+039 3C196 Q1209+1046 PG1247+268 3C286 PG1329+412 PB3977 3C336 PG2112+059 3C446 ------------------------------------------------------------------------------------------------------------------------------------