8875( 3) - 09/28/00 10:36 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 8875 Version: 3 Check-in Date: 28-Sep-2000 10:35:40 1.Proposal Title: Coordinated HST and FUSE Observations of the IGM in the QSO HE2347-4342 ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO/DD 9 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: Gerard Kriss Space Telescope Science Institute CoI: Donald Morton Dominion Astrophysical Observatory N CoI: J. Michael Shull University of Colorado N CoI: William Oegerle The Johns Hopkins University N CoI: Dr. Wei Zheng The Johns Hopkins University N CoI: Lennox Cowie University of Hawaii N CoI: Arthur Davidsen The Johns Hopkins University N CoI: Jean-Michel Deharveng Laboratoire d'Astronomie Spatiale N CoI: Richard Green National Optical Astronomy Observatories N CoI: John Hutchings Dominion Astrophysical Observatory N CoI: Edward Jenkins Princeton University Observatory N CoI: Jeffrey Kruk The Johns Hopkins University N CoI: Warren Moos The Johns Hopkins University N ------------------------------------------------------------------------------------ 5. Abstract The neutral hydrogen absorption lines and the ionized helium absorption visible in the spectra of high-redshift QSOs are a unique probe of structure in the universe at epochs intermediate between the earliest density fluctuations seen in the cosmic background radiation and the visible distribution of galaxies today. We will use Far -Ultraviolet Spectroscopic Explorer (FUSE) observations of the line of sight to the QSO HE2347-4342 to investigate the fine-scale structure of the He II absorption from z=2.0--2.88. Coordinated HST/STIS observations of the longer-wavelength UV spectrum will establish the UV continuum level and shape, which is crucial for determining the opacity in the FUSE wavelength range. When combined with existing Keck observations of the H I Ly alpha forest, the FUSE/HST measurements will constrain the mean density of the IGM along with its temperature, ionization state, density and velocity structure. These observations will also shed new light on the source of ionizing radiation in the universe at z=2--3 and allow us to study the evolution of matter and radiation throughout an important epoch when galaxies were forming. ------------------------------------------------------------------------------------ 8875( 3) - 09/28/00 10:36 - [ 2] Observations Description ------------------------ We will observe HE2347-4342 in two visits coordinated with upcoming FUSE observations of this quasar scheduled for 17-AUG-2000 to 24-AUG-2000, and 2-OCT -2000 to 9-OCT-2000. During each visit we will obtain FUV and NUV low- resolution spectra through the 52X0.5 arcsec aperture using gratings G140L and G230L. Real Time Justification ----------------------- None Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 8875( 3) - 09/28/00 10:36 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HE2347-4342 GALAXY, QSO RA=23H 50M 34.24S +/- 0.1S, DEC= J2000 Z=2.885 F-CONT(1400)=0.3+/-0.1e-14 -43D 26' 00.0" +/- 1.0", PLATE- F-CONT(2300)=0.5+/-0.1e-15 ID=01OQ V = 16.3+/-0.5 Coordinate Source: GSC_SURVEY_PLATE Comments: UV flux is variable by factors of tens of percent 8875( 3) - 09/28/00 10:36 - [ 4] Visit: 01 Visit Priority: Visit Requirements: SCHED 100% BETWEEN 17-AUG-2000 AND 24-AUG-2000 On Hold Comments: Additional Comments: To be coordinated to within this week with FUSE Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HE2347-4342 STIS/C ACQ F28X50L MIRROR 1 5.0 S CD P ------------------------------------------------------------------------------------------------------------------------------------ 2 HE2347-4342 STIS/F ACCUM 52X0.5 G140L 1425 1 1060 S MAX DUR UV-MAM A ------------------------------------------------------------------------------------------------------------------------------------ 3 HE2347-4342 STIS/N ACCUM 52X0.5 G230L 2376 1 640 S MAX DUR UV-MAM A ------------------------------------------------------------------------------------------------------------------------------------ 8875( 3) - 09/28/00 10:36 - [ 5] Visit: 02 Visit Priority: Visit Requirements: SCHED 100% BETWEEN 14-OCT-2000 AND 21-OCT-2000 On Hold Comments: Additional Comments: To be coordinated to within this week with FUSE Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HE2347-4342 STIS/C ACQ F28X50L MIRROR 1 5.0 S CD P ------------------------------------------------------------------------------------------------------------------------------------ 2 HE2347-4342 STIS/F ACCUM 52X0.5 G140L 1425 1 1060 S MAX DUR UV-MAM A ------------------------------------------------------------------------------------------------------------------------------------ 3 HE2347-4342 STIS/N ACCUM 52X0.5 G230L 2376 1 640 S MAX DUR UV-MAM A ------------------------------------------------------------------------------------------------------------------------------------ 8875( 3) - 09/28/00 10:36 - [ 6] Summary Form for Proposal 8875 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures F28X50LP 52X0.5 ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD STIS/FUV-MAMA STIS/NUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO/DD ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements SCHED 100% BETWEEN 17-AUG-2000 AND 24-AUG-2000 MAX DUR SCHED 100% BETWEEN 14-OCT-2000 AND 21-OCT-2000 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR G140L G230L ------------------------------------------------------------------------------------------------------------------------------------ Target Names HE2347-4342 ------------------------------------------------------------------------------------------------------------------------------------ Wavelengths 1425 2376 ------------------------------------------------------------------------------------------------------------------------------------