10231( 7) - 06/23/05 10:01 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 10231 Version: 7 Check-in Time: 23-Jun-2005 13:59:55 Title Tracing the Reionization History of Intergalactic Helium out to Redshift 3.8 ------------------------------------------------------------------------------------ Type Cycle Parallel Pointing Tolerance GO 13 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Wei Zheng The Johns Hopkins University CoI: Dr. Scott Anderson University of Washington N CoI: Dr. Scott Burles Massachusetts Institute of Technology N CoI: Mr. Kuenley Chiu The Johns Hopkins University N CoI: Dr. Craig Hogan University of Washington N CoI: Dr. Gerard A. Kriss Space Telescope Science Institute N CoI: Prof. Avery Meiksin Royal Observatory Edinburgh N CoI: Dr. Donald P. Schneider The Pennsylvania State University N CoI: Dr. David Weinberg The Ohio State University Research N Foundation CoI: Dr. Donald G. York University of Chicago N ------------------------------------------------------------------------------------ Abstract We have found He II absorption in a quasar at redshift 3.82 via our Cycle 12 program of UV snapshots. This is the highest redshift yet at which He II absorption has been observed, and we propose a high S/N STIS follow-on spectrum to study helium ionization in the IGM along this new, long, unobscured sightline to high-redshift. The object has UV flux comparable to that of the rare handful of other z>3 quasars known to be suitable for helium studies, and it is also in the Continuous Viewing Zone, permitting a high-quality STIS spectrum in just 8 HST orbits. The proposed spectrum will allow us to study the evolution and properties of the IGM and ionizing radiation from z=3.8 (the IGM environment near the quasar) all the way down to z=2.8. This redshift range may span the epoch of helium reionization, and even extends to high enough redshift to enable improved helium opacity measures using both He II Ly-alpha and Ly-beta. This program is now approved to use ACS prism. ------------------------------------------------------------------------------------ 10231( 7) - 06/23/05 10:01 - [ 2] Observations Description ------------------------ This object was observed in our SNAP program with the same configuration, for 600 sec. We will carry out a longer exposure to improve the S/N. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 10231( 7) - 06/23/05 10:01 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSS1711+605 GALAXY, QSO RA=17H11M34.4200S +/- 0.2", J2000 Z = 3.8 V = 19.4+/-0.3 2 DEC=+60D52'40.48" +/- 0.2", PLATE-ID=00T2 Coordinate Source: HST_IMAGE 10231( 7) - 06/23/05 10:01 - [ 4] Visit: 01 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSS1711+60 ACS/SBC ACCUM SBC F150LP 1 100 S 52 ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSS1711+60 ACS/SBC ACCUM SBC PR130L 1 830 S SHADOW 52 ------------------------------------------------------------------------------------------------------------------------------------ 3 SDSS1711+60 ACS/SBC ACCUM SBC PR130L 1 830 S POS TARG 0.017, 0; SHADOW 52 ------------------------------------------------------------------------------------------------------------------------------------ 4 SDSS1711+60 ACS/SBC ACCUM SBC F150LP 1 75 S POS TARG 0.017, 0 52 see below ------------------------------------------------------------------------------------------------------------------------------------ 5 SDSS1711+60 ACS/SBC ACCUM SBC PR130L 1 700 S 52 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SDSS1711+6052 1 ACS/SBC ACCUM SBC F150LP none none none none 1 N/A SDSS1711+6052 2 ACS/SBC ACCUM SBC PR130L none none none none 1 N/A SDSS1711+6052 3 ACS/SBC ACCUM SBC PR130L none none none none 1 N/A SDSS1711+6052 4 ACS/SBC ACCUM SBC F150LP none none none none 1 10.0 S SDSS1711+6052 5 ACS/SBC ACCUM SBC PR130L none none none none 1 N/A 10231( 7) - 06/23/05 10:01 - [ 5] Visit: 02 Visit Priority: Visit Requirements: ORIENT 20.0D TO 180.0D FROM 01 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSS1711+60 ACS/SBC ACCUM SBC F150LP 1 10 S 52 ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSS1711+60 ACS/SBC ACCUM SBC PR130L 1 855 S SHADOW 52 ------------------------------------------------------------------------------------------------------------------------------------ 3 SDSS1711+60 ACS/SBC ACCUM SBC PR130L 1 855 S POS TARG 0.017, 0; SHADOW 52 ------------------------------------------------------------------------------------------------------------------------------------ 4 SDSS1711+60 ACS/SBC ACCUM SBC F150LP 1 10 S POS TARG 0.017, 0 52 see below ------------------------------------------------------------------------------------------------------------------------------------ 5 SDSS1711+60 ACS/SBC ACCUM SBC PR130L 1 640 S 52 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SDSS1711+6052 1 ACS/SBC ACCUM SBC F150LP none none none none 1 N/A SDSS1711+6052 2 ACS/SBC ACCUM SBC PR130L none none none none 1 N/A SDSS1711+6052 3 ACS/SBC ACCUM SBC PR130L none none none none 1 N/A SDSS1711+6052 4 ACS/SBC ACCUM SBC F150LP none none none none 1 10.0 S SDSS1711+6052 5 ACS/SBC ACCUM SBC PR130L none none none none 1 N/A 10231( 7) - 06/23/05 10:01 - [ 6] Visit: 03 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSS1711+60 ACS/SBC ACCUM SBC F150LP 1 100 S 52 ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSS1711+60 ACS/SBC ACCUM SBC PR130L 1 830 S SHADOW 52 ------------------------------------------------------------------------------------------------------------------------------------ 3 SDSS1711+60 ACS/SBC ACCUM SBC PR130L 1 830 S POS TARG 0.017, 0; SHADOW 52 ------------------------------------------------------------------------------------------------------------------------------------ 4 SDSS1711+60 ACS/SBC ACCUM SBC F150LP 1 100 S POS TARG 0.017, 0 52 ------------------------------------------------------------------------------------------------------------------------------------ 5 SDSS1711+60 ACS/SBC ACCUM SBC PR130L 1 630 S 52 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SDSS1711+6052 1 ACS/SBC ACCUM SBC F150LP none none none none 1 N/A SDSS1711+6052 2 ACS/SBC ACCUM SBC PR130L none none none none 1 N/A SDSS1711+6052 3 ACS/SBC ACCUM SBC PR130L none none none none 1 N/A SDSS1711+6052 4 ACS/SBC ACCUM SBC F150LP none none none none 1 N/A SDSS1711+6052 5 ACS/SBC ACCUM SBC PR130L none none none none 1 N/A 10231( 7) - 06/23/05 10:01 - [ 7] Visit: 04 Visit Priority: Visit Requirements: SAME ORIENT AS 03 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSS1711+60 ACS/SBC ACCUM SBC F150LP 1 100 S 52 ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSS1711+60 ACS/SBC ACCUM SBC PR130L 1 830 S SHADOW 52 ------------------------------------------------------------------------------------------------------------------------------------ 3 SDSS1711+60 ACS/SBC ACCUM SBC PR130L 1 830 S POS TARG 0.017, 0; SHADOW 52 ------------------------------------------------------------------------------------------------------------------------------------ 4 SDSS1711+60 ACS/SBC ACCUM SBC F150LP 1 100 S POS TARG 0.017, 0 52 ------------------------------------------------------------------------------------------------------------------------------------ 5 SDSS1711+60 ACS/SBC ACCUM SBC PR130L 1 630 S 52 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SDSS1711+6052 1 ACS/SBC ACCUM SBC F150LP none none none none 1 N/A SDSS1711+6052 2 ACS/SBC ACCUM SBC PR130L none none none none 1 N/A SDSS1711+6052 3 ACS/SBC ACCUM SBC PR130L none none none none 1 N/A SDSS1711+6052 4 ACS/SBC ACCUM SBC F150LP none none none none 1 N/A SDSS1711+6052 5 ACS/SBC ACCUM SBC PR130L none none none none 1 N/A 10231( 7) - 06/23/05 10:01 - [ 8] Visit: 05 Visit Priority: Visit Requirements: SAME ORIENT AS 03 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSS1711+60 ACS/SBC ACCUM SBC F150LP 1 100 S 52 ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSS1711+60 ACS/SBC ACCUM SBC PR130L 1 830 S SHADOW 52 ------------------------------------------------------------------------------------------------------------------------------------ 3 SDSS1711+60 ACS/SBC ACCUM SBC PR130L 1 830 S POS TARG 0.017, 0; SHADOW 52 ------------------------------------------------------------------------------------------------------------------------------------ 4 SDSS1711+60 ACS/SBC ACCUM SBC F150LP 1 100 S POS TARG 0.017, 0 52 ------------------------------------------------------------------------------------------------------------------------------------ 5 SDSS1711+60 ACS/SBC ACCUM SBC PR130L 1 630 S 52 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SDSS1711+6052 1 ACS/SBC ACCUM SBC F150LP none none none none 1 N/A SDSS1711+6052 2 ACS/SBC ACCUM SBC PR130L none none none none 1 N/A SDSS1711+6052 3 ACS/SBC ACCUM SBC PR130L none none none none 1 N/A SDSS1711+6052 4 ACS/SBC ACCUM SBC F150LP none none none none 1 N/A SDSS1711+6052 5 ACS/SBC ACCUM SBC PR130L none none none none 1 N/A 10231( 7) - 06/23/05 10:01 - [ 9] Visit: 06 Visit Priority: Visit Requirements: SAME ORIENT AS 03 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSS1711+60 ACS/SBC ACCUM SBC F150LP 1 100 S 52 ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSS1711+60 ACS/SBC ACCUM SBC PR130L 1 830 S SHADOW 52 ------------------------------------------------------------------------------------------------------------------------------------ 3 SDSS1711+60 ACS/SBC ACCUM SBC PR130L 1 830 S POS TARG 0.017, 0; SHADOW 52 ------------------------------------------------------------------------------------------------------------------------------------ 4 SDSS1711+60 ACS/SBC ACCUM SBC F150LP 1 100 S POS TARG 0.017, 0 52 ------------------------------------------------------------------------------------------------------------------------------------ 5 SDSS1711+60 ACS/SBC ACCUM SBC PR130L 1 630 S 52 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SDSS1711+6052 1 ACS/SBC ACCUM SBC F150LP none none none none 1 N/A SDSS1711+6052 2 ACS/SBC ACCUM SBC PR130L none none none none 1 N/A SDSS1711+6052 3 ACS/SBC ACCUM SBC PR130L none none none none 1 N/A SDSS1711+6052 4 ACS/SBC ACCUM SBC F150LP none none none none 1 N/A SDSS1711+6052 5 ACS/SBC ACCUM SBC PR130L none none none none 1 N/A 10231( 7) - 06/23/05 10:01 - [ 10] Visit: 07 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSS1711+60 ACS/SBC ACCUM SBC F150LP 1 10 S 52 ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSS1711+60 ACS/SBC ACCUM SBC PR130L 1 855 S SHADOW 52 ------------------------------------------------------------------------------------------------------------------------------------ 3 SDSS1711+60 ACS/SBC ACCUM SBC PR130L 1 855 S POS TARG 0.017, 0; SHADOW 52 ------------------------------------------------------------------------------------------------------------------------------------ 4 SDSS1711+60 ACS/SBC ACCUM SBC F150LP 1 10 S POS TARG 0.017, 0 52 see below ------------------------------------------------------------------------------------------------------------------------------------ 5 SDSS1711+60 ACS/SBC ACCUM SBC PR130L 1 640 S 52 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SDSS1711+6052 1 ACS/SBC ACCUM SBC F150LP none none none none 1 N/A SDSS1711+6052 2 ACS/SBC ACCUM SBC PR130L none none none none 1 N/A SDSS1711+6052 3 ACS/SBC ACCUM SBC PR130L none none none none 1 N/A SDSS1711+6052 4 ACS/SBC ACCUM SBC F150LP none none none none 1 10.0 S SDSS1711+6052 5 ACS/SBC ACCUM SBC PR130L none none none none 1 N/A 10231( 7) - 06/23/05 10:01 - [ 11] Visit: 08 Visit Priority: Visit Requirements: ORIENT 20.0D TO 180.0D FROM 07 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSS1711+60 ACS/SBC ACCUM SBC F150LP 1 10 S 52 ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSS1711+60 ACS/SBC ACCUM SBC PR130L 1 855 S SHADOW 52 ------------------------------------------------------------------------------------------------------------------------------------ 3 SDSS1711+60 ACS/SBC ACCUM SBC PR130L 1 855 S POS TARG 0.017, 0; SHADOW 52 ------------------------------------------------------------------------------------------------------------------------------------ 4 SDSS1711+60 ACS/SBC ACCUM SBC F150LP 1 10 S POS TARG 0.017, 0 52 see below ------------------------------------------------------------------------------------------------------------------------------------ 5 SDSS1711+60 ACS/SBC ACCUM SBC PR130L 1 640 S 52 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SDSS1711+6052 1 ACS/SBC ACCUM SBC F150LP none none none none 1 N/A SDSS1711+6052 2 ACS/SBC ACCUM SBC PR130L none none none none 1 N/A SDSS1711+6052 3 ACS/SBC ACCUM SBC PR130L none none none none 1 N/A SDSS1711+6052 4 ACS/SBC ACCUM SBC F150LP none none none none 1 10.0 S SDSS1711+6052 5 ACS/SBC ACCUM SBC PR130L none none none none 1 N/A 10231( 7) - 06/23/05 10:01 - [ 12] Visit: 09 Visit Priority: Visit Requirements: SAME ORIENT AS 03 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSS1711+60 ACS/SBC ACCUM SBC F150LP 1 100 S 52 ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSS1711+60 ACS/SBC ACCUM SBC PR130L 1 830 S SHADOW 52 ------------------------------------------------------------------------------------------------------------------------------------ 3 SDSS1711+60 ACS/SBC ACCUM SBC PR130L 1 830 S POS TARG 0.017, 0; SHADOW 52 ------------------------------------------------------------------------------------------------------------------------------------ 4 SDSS1711+60 ACS/SBC ACCUM SBC F150LP 1 100 S POS TARG 0.017, 0 52 ------------------------------------------------------------------------------------------------------------------------------------ 5 SDSS1711+60 ACS/SBC ACCUM SBC PR130L 1 630 S 52 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SDSS1711+6052 1 ACS/SBC ACCUM SBC F150LP none none none none 1 N/A SDSS1711+6052 2 ACS/SBC ACCUM SBC PR130L none none none none 1 N/A SDSS1711+6052 3 ACS/SBC ACCUM SBC PR130L none none none none 1 N/A SDSS1711+6052 4 ACS/SBC ACCUM SBC F150LP none none none none 1 N/A SDSS1711+6052 5 ACS/SBC ACCUM SBC PR130L none none none none 1 N/A 10231( 7) - 06/23/05 10:01 - [ 13] Summary Form for Proposal 10231 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures SBC ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/SBC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements SHADOW POS TARG 0.017, 0; SHADOW POS TARG 0.017, 0 ORIENT 20.0D TO 180.0D FROM 01 SAME ORIENT AS 03 ORIENT 20.0D TO 180.0D FROM 07 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F150LP PR130L ------------------------------------------------------------------------------------------------------------------------------------ Target Names SDSS1711+6052 ------------------------------------------------------------------------------------------------------------------------------------