9896( 6) - 06/27/03 12:53 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 9896 Version: 6 Check-in Date: 27-Jun-2003 12:51:23 1.Proposal Title: A Survey of Extinction Curves to Redshift z=1 ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO 12 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: Dr. Jose A. Munoz Universidad de Valencia CoI: Dr. Christopher S. Kochanek Smithsonian Institution Astrophysical N Observatory CoI: Dr. Emilio E. Falco Smithsonian Institution Astrophysical N Observatory CoI: Dr. Brian Mcleod Smithsonian Institution Astrophysical N Observatory CoI: Dr. Evencio Mediavilla Instituto de Astrofisica de Canarias N CoI: Dr. Santiago Arribas Space Telescope Science Institute N ------------------------------------------------------------------------------------ 5. Abstract The effects of dust are crucial to the study of galaxies (through models of galaxy evolution and star formation rates/histories), cosmology (e.g., through its effects on SNe Ia fluxes), and the interpretation of gamma-ray burst afterglows. ?However, classical methods for obtaining precise extinction curves cannot be applied outside the Local Group. Recently, we demonstrated that gravitational lenses can be used to measure extinction curves at intermediate redshifts with high accuracy. We propose a survey of the extinction curves in 6 lens galaxies known to contain dust, to study the evolution of dust properties in galaxies out to z=1. ?We will obtain multi- wavelength photometry (6 filters from 8140 A to 2550 A) of each system to (1) construct non-parametric extinction curves which overlap the 2175 A feature, (2) measure R(V) to a 2-sigma accuracy better than 0.5 for parametric models of Galactic dust, and (3) discriminate between Galactic and SMC extinction curves to better than 2-sigma accuracy. The compact angular size of the lens systems (1-2 arcsec) and the need for near-UV images means that HST is required to make the measurements. ------------------------------------------------------------------------------------ 9896( 6) - 06/27/03 12:53 - [ 2] Observations Description ------------------------ We will use the ACS/HRC for the observations. While ACS/WFC has higher sensitivity in the optical, the lower overheads for short integration times, the near-UV sensitivity, and the reduced risk of saturation all make the ACS/HRC a better choice for the program. We selected the I=F814W, r=F625W, V=F555W, B=F435W, U=F330W and Near-UV=F250W and F220W filters for these observations to cover the wavelength range from the rest-frame optical through the redshifted 2175\AA\ feature without significant overlaps in the filter passbands. The quasars will have a strong UV continuum up to the redshifted Ly$\alpha$ break, which turns out to be an unimportant limitation in the current sample. The F250W and F220W filters requires the longest exposure times but also provides the strongest discrimination between Galactic and SMC extinction curves. Precision photometry with HST requires dithered, CR-split images to remove the many hot pixels and cosmic rays that would contaminate the photometry. Based on our experience we need at least 4 sub-images for each filter consisting of a CR-split image pair at two different dither locations. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 9896( 6) - 06/27/03 12:53 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HE0512-3329 GALAXY, GRAVITATIONAL RA=05H14M10.78S +/- 0.1", DEC=- J2000 V = 18.4 LENS 33D26'22.5" +/- 0.1" Coordinate Source: HST_IMAGE 2 FBQ0951+2635 GALAXY, GRAVITATIONAL RA=09H51M22.57S +/- 0.1", J2000 V = 18.3 LENS DEC=+26D35'14.1" +/- 0.1" Coordinate Source: HST_IMAGE 3 HE1104-1805 GALAXY, GRAVITATIONAL RA=11H06M33.45S +/- 0.1", DEC=- J2000 V = 18.7 LENS 18D21'24.2" +/- 0.1" Coordinate Source: HST_IMAGE 4 H1413+117 GALAXY, GRAVITATIONAL RA=14H15M46.4S +/- 0.1", J2000 V = 18.4 LENS DEC=+11D29'41.4" +/- 0.1" Coordinate Source: HST_IMAGE 5 SBS1520+530 GALAXY, GRAVITATIONAL RA=15H21M44.83S +/- 0.1", J2000 V = 19.5 LENS DEC=+52D54'48.6" +/- 0.1" Coordinate Source: HST_IMAGE 6 B1600+434 GALAXY, GRAVITATIONAL RA=16H01M40.45S +/- 0.1", J2000 V = 23.6 LENS DEC=+43D16'47.8" +/- 0.1" Coordinate Source: HST_IMAGE 9896( 6) - 06/27/03 12:53 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-HRC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.198 Coordinate_Frame POS-TARG Pattern_Orient 44.28 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type ACS-HRC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.198 Coordinate_Frame POS-TARG Pattern_Orient 44.28 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 9896( 6) - 06/27/03 12:53 - [ 5] 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 HE0512-3329 ACS/HR ACCUM HRC F220W CR-SPLIT=2 1 712 S PATTERN 2 1-7 C ------------------------------------------------------------------------------------------------------------------------------------ 2 HE0512-3329 ACS/HR ACCUM HRC F250W CR-SPLIT=2 1 136 S C ------------------------------------------------------------------------------------------------------------------------------------ 3 HE0512-3329 ACS/HR ACCUM HRC F330W CR-SPLIT=2 1 43 S C ------------------------------------------------------------------------------------------------------------------------------------ 4 HE0512-3329 ACS/HR ACCUM HRC F435W CR-SPLIT=2 1 12 S C ------------------------------------------------------------------------------------------------------------------------------------ 5 HE0512-3329 ACS/HR ACCUM HRC F555W CR-SPLIT=2 1 9 S C ------------------------------------------------------------------------------------------------------------------------------------ 6 HE0512-3329 ACS/HR ACCUM HRC F625W CR-SPLIT=2 1 8 S C ------------------------------------------------------------------------------------------------------------------------------------ 7 HE0512-3329 ACS/HR ACCUM HRC F814W CR-SPLIT=2 1 6 S C ------------------------------------------------------------------------------------------------------------------------------------ 9896( 6) - 06/27/03 12:53 - [ 6] 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 FBQ0951+263 ACS/HR ACCUM HRC F220W CR-SPLIT=2 1 184 S PATTERN 1 1-7 5 C ------------------------------------------------------------------------------------------------------------------------------------ 2 FBQ0951+263 ACS/HR ACCUM HRC F250W CR-SPLIT=2 1 58 S 5 C ------------------------------------------------------------------------------------------------------------------------------------ 3 FBQ0951+263 ACS/HR ACCUM HRC F330W CR-SPLIT=2 1 25 S 5 C ------------------------------------------------------------------------------------------------------------------------------------ 4 FBQ0951+263 ACS/HR ACCUM HRC F435W CR-SPLIT=2 1 8 S 5 C ------------------------------------------------------------------------------------------------------------------------------------ 5 FBQ0951+263 ACS/HR ACCUM HRC F555W CR-SPLIT=2 1 6 S 5 C ------------------------------------------------------------------------------------------------------------------------------------ 6 FBQ0951+263 ACS/HR ACCUM HRC F625W CR-SPLIT=2 1 4 S 5 C ------------------------------------------------------------------------------------------------------------------------------------ 7 FBQ0951+263 ACS/HR ACCUM HRC F814W CR-SPLIT=2 1 4 S 5 C ------------------------------------------------------------------------------------------------------------------------------------ 9896( 6) - 06/27/03 12:53 - [ 7] 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 HE1104-1805 ACS/HR ACCUM HRC F250W CR-SPLIT=2 1 841.8 S PATTERN 2 1-6 C ------------------------------------------------------------------------------------------------------------------------------------ 2 HE1104-1805 ACS/HR ACCUM HRC F330W CR-SPLIT=2 1 101 S C ------------------------------------------------------------------------------------------------------------------------------------ 3 HE1104-1805 ACS/HR ACCUM HRC F435W CR-SPLIT=2 1 17 S C ------------------------------------------------------------------------------------------------------------------------------------ 4 HE1104-1805 ACS/HR ACCUM HRC F555W CR-SPLIT=2 1 10 S C ------------------------------------------------------------------------------------------------------------------------------------ 5 HE1104-1805 ACS/HR ACCUM HRC F625W CR-SPLIT=2 1 8 S C ------------------------------------------------------------------------------------------------------------------------------------ 6 HE1104-1805 ACS/HR ACCUM HRC F814W CR-SPLIT=2 1 8 S C ------------------------------------------------------------------------------------------------------------------------------------ 7 HE1104-1805 ACS/HR ACCUM HRC F330W CR-SPLIT=2 1 98 S C ------------------------------------------------------------------------------------------------------------------------------------ 9896( 6) - 06/27/03 12:53 - [ 8] 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 H1413+117 ACS/HR ACCUM HRC F250W CR-SPLIT=2 1 1510 S PATTERN 1 1-6 C ------------------------------------------------------------------------------------------------------------------------------------ 2 H1413+117 ACS/HR ACCUM HRC F330W CR-SPLIT=2 1 119 S C ------------------------------------------------------------------------------------------------------------------------------------ 3 H1413+117 ACS/HR ACCUM HRC F435W CR-SPLIT=2 1 15 S C ------------------------------------------------------------------------------------------------------------------------------------ 4 H1413+117 ACS/HR ACCUM HRC F555W CR-SPLIT=2 1 9 S C ------------------------------------------------------------------------------------------------------------------------------------ 5 H1413+117 ACS/HR ACCUM HRC F625W CR-SPLIT=2 1 8 S C ------------------------------------------------------------------------------------------------------------------------------------ 6 H1413+117 ACS/HR ACCUM HRC F814W CR-SPLIT=2 1 8 S C ------------------------------------------------------------------------------------------------------------------------------------ 9896( 6) - 06/27/03 12:53 - [ 9] Visit: 05 Visit Priority: Visit Requirements: ORIENT 130.0D TO 140.0 D 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 SBS1520+530 ACS/HR ACCUM HRC F250W CR-SPLIT=2 1 828 S POS TARG 8, 8 PATTERN 2 C 1-6 ------------------------------------------------------------------------------------------------------------------------------------ 2 SBS1520+530 ACS/HR ACCUM HRC F330W CR-SPLIT=2 1 187 S POS TARG 8, 8 C ------------------------------------------------------------------------------------------------------------------------------------ 3 SBS1520+530 ACS/HR ACCUM HRC F435W CR-SPLIT=2 1 47 S POS TARG 8, 8 C ------------------------------------------------------------------------------------------------------------------------------------ 4 SBS1520+530 ACS/HR ACCUM HRC F555W CR-SPLIT=2 1 30 S POS TARG 8, 8 C ------------------------------------------------------------------------------------------------------------------------------------ 5 SBS1520+530 ACS/HR ACCUM HRC F625W CR-SPLIT=2 1 26 S POS TARG 8, 8 C ------------------------------------------------------------------------------------------------------------------------------------ 6 SBS1520+530 ACS/HR ACCUM HRC F814W CR-SPLIT=2 1 24 S POS TARG 8, 8 C ------------------------------------------------------------------------------------------------------------------------------------ 9896( 6) - 06/27/03 12:53 - [ 10] 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 B1600+434 ACS/HR ACCUM HRC F330W CR-SPLIT=2 1 2159 S PATTERN 1 1-5 C ------------------------------------------------------------------------------------------------------------------------------------ 2 B1600+434 ACS/HR ACCUM HRC F435W CR-SPLIT=2 1 996 S C ------------------------------------------------------------------------------------------------------------------------------------ 3 B1600+434 ACS/HR ACCUM HRC F555W CR-SPLIT=2 1 803 S C ------------------------------------------------------------------------------------------------------------------------------------ 4 B1600+434 ACS/HR ACCUM HRC F625W CR-SPLIT=2 1 623 S C ------------------------------------------------------------------------------------------------------------------------------------ 5 B1600+434 ACS/HR ACCUM HRC F814W CR-SPLIT=2 1 586 S C ------------------------------------------------------------------------------------------------------------------------------------ 9896( 6) - 06/27/03 12:53 - [ 11] Summary Form for Proposal 9896 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures HRC ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/HRC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=2 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 2 1-7 PATTERN 1 1-7 PATTERN 2 1-6 PATTERN 1 1-6 ORIENT 130.0D TO 140.0 D POS TARG 8, 8 PATTERN 2 1-6 POS TARG 8, 8 PATTERN 1 1-5 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F220W F250W F330W F435W F555W F625W F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names HE0512-3329 FBQ0951+2635 HE1104-1805 H1413+117 SBS1520+530 B1600+434 ------------------------------------------------------------------------------------------------------------------------------------