6606( 4) - 08/21/96 14:33 - [ 0] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6606 Version: 4 Check-in Date: 21-Aug-1996 14:31:03 1.Proposal Title: The Connection between the Ly-Alpha Forest at z=0.5 and Large Scale Structures in the Galaxy Distribution ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle QSO ABSORPTION LINES GO 6 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: JILL BECHTOLD UNIVERSITY OF ARIZONA CoI: Dr. Howard Yee University of Toronto N CoI: Dr. Erica Ellingson University of Colorado N ------------------------------------------------------------------------------------ 6. Abstract We will obtain a spectrum of the bright quasar Q0015+162, which is on the edge of the high-redshift (z=0.548) cluster of galaxies, CL 0016+16. A redshift survey of this cluster and its environs has recently been completed at the CFHT (CNOC1), providing redshifts of ~100 faint galaxies in this field between z=0.3 and 0.55. The FOS spectrum will cover the region including the Ly-Alpha forest at these redshifts, as well as the corresponding C IV lines. So far, the striking result of the deep surveys for galaxies associated with Ly-Alpha clouds at very low-redshift is the spatial correlation of the clouds with superclusters and other large structures in the galaxy distribution. We plan to see if this correlation extends to intermediate redshifts, which will have implications for the interpretation of the evolution of the Ly-Alpha forest. ------------------------------------------------------------------------------------ Observations Description ------------------------ We estimate that in order to achieve our scientific objectives we require at least S/N = 30 per diode (4 pixels per diode): from simulations of the LyAlpha forest we estimate that 95\\% of the lines will then be recovered. The quasar has Johnson R=18.1 magn (from CNOC photometry), and Galactic reddening of E(B- V)=0.017. We request the 1'' aperture in order to obtain high resolution, yet minimize overhead for acquisition. We will apply small wavelength shifts to the data based on ISM lines from the Milky Way, but the likely shifts will not be large enough to compromise the scientific conclusions. We ran SYNPHOT in IRAF, for the G190H grating, and FOS/RED detectors, post-COSTAR, to derive the count rate per diode, assuming the quasar has a power-law continuum with Alpha=0.7. We verified the results with the analytic expressions in the FOS manual. In 7 orbits (see below) we will obtain 240 minutes for this source, and with 0.07 cps/diode, 1008 net counts and 144 dark counts, for S/N=29. We now estimate the total number of orbits. The total visibility for this declination is 52 minutes per orbit. Since we do not know the energy distribution and the quasar may be variable, the 1'' aperture requires the 7+14+20 acquisition procedure. Thus, the first orbit is devoted to acquisition with no exposure of the source. After that, each orbit gives 40 minutes of exposure on source. Thus we require 7 orbits to obtain 240 minutes. Real Time Justification ----------------------- None. We will obtain a high dispersion optical spectrum of this object at the Multiple Mirror Telescope (MMT) which will cover the Mg II region, and help identify metal-line systems along the line-of-sight. Other related optical observations are described in the text. Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 6606( 4) - 08/21/96 14:33 - [ 1] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 QSO0015+162 GALAXY,QSO RA=00H 18M 31.9S +/- 0.1S, J2000 Z=.56 V = 18.1+/-0.5 DEC=+16D 29' 26.4" +/- 0.5", B-V = 0.0+/-0.2 PLATE-ID=01G3 6606( 4) - 08/21/96 14:33 - [ 2] Visit: 01 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 ------------------------------------------------------------------------------------------------------------------------------------ 10 QSO0015+162 FOS/RD ACQ/PEA 4.3 MIRROR SCAN-STEP-Y=1.23,SEARCH-SIZE-Y=3, 1 3.63 S ONBOARD ACQ FOR 20 K SEARCH-SIZE-X=1 Comments: stage 1 of 4-stage peakup ------------------------------------------------------------------------------------------------------------------------------------ 20 QSO0015+162 FOS/RD ACQ/PEA 1.0 MIRROR SCAN-STEP-X=0.61,SCAN-STEP-Y=0.61 1 3.63 S ONBOARD ACQ FOR 30 K ,SEARCH-SIZE-X=2,SEARCH-SIZE-Y=6 Comments: stage 2 of 4-stage peakup ------------------------------------------------------------------------------------------------------------------------------------ 30 QSO0015+162 FOS/RD ACQ/PEA 0.5 MIRROR SCAN-STEP-X=0.29,SCAN-STEP-Y=0.29 1 3.63 S ONBOARD ACQ FOR 40 K ,SEARCH-SIZE-Y=3,SEARCH-SIZE-X=3 Comments: stage 3 of 4-stage peakup ------------------------------------------------------------------------------------------------------------------------------------ 40 QSO0015+162 FOS/RD ACQ/PEA 0.3 MIRROR SCAN-STEP-X=0.11,SCAN-STEP-Y=0.11 1 36.0 S ONBOARD ACQ for 50 K ,SEARCH-SIZE-Y=4,SEARCH-SIZE-X=4 Comments: final peakup ------------------------------------------------------------------------------------------------------------------------------------ 50 QSO0015+162 FOS/RD ACCUM 1.0 G190H 1 14400 S Comments: exposure on the object ------------------------------------------------------------------------------------------------------------------------------------ 55 WAVE FOS/RD ACCUM 1.0 G190H 1 DEF Comments: calibration for 50; ------------------------------------------------------------------------------------------------------------------------------------ 6606( 4) - 08/21/96 14:33 - [ 3] Summary Form for Proposal 6606 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FOS/RD ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/PEAK ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SCAN-STEP-Y=1.23 SEARCH-SIZE-Y=3 SEARCH-SIZE-X=1 SEARCH-SIZE-Y=6 SEARCH-SIZE-X=3 SEARCH-SIZE-X=4 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category QSO ABSORPTION LINES ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ FOR 20 ONBOARD ACQ FOR 30 ONBOARD ACQ FOR 40 ONBOARD ACQ for 50 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR G190H ------------------------------------------------------------------------------------------------------------------------------------ Target Names QSO0015+162 WAVE ------------------------------------------------------------------------------------------------------------------------------------