! Hubble Space Telescope Cycle 5 (1995) Phase II Proposal Template ! $Id: 5959,v 6.1 1996/06/10 22:34:28 pepsa Exp $ ! ! Refer to the HST Phase II Proposal Instructions to fill this out ! ! Anything after a "!" is ignored, and may be deleted ! ! All keywords with multiple entries are comma delimited except the ! Visit_Requirements and Special_Requirements keywords which can be ! delimited with carriage returns or semi-colons, but not commas ! ! For help call your Program Coordinator: Alice Berman ! Phone: 410 338-4462 , E-mail: aberman@stsci.edu ! ! This partially completed template was generated from a Phase I proposal. ! Date generated: Sat Dec 17 11:24:58 EST 1994 ! Proposal_Information ! Section 4 Title: Intergalactic Gunn-Peterson Absorption in Five Quasars Proposal_Category: GO Scientific_Category: QSO ABSORPTION LINES Cycle: 5 Investigators PI_name: Prof. David Tytler PI_Institution: University of California, San Diego CoI_Name: Lance Cottrell CoI_Institution: University of California, San Diego Contact: ! Y or N (designate at most one contact) CoI_Name: Xiao-Ming Fan CoI_Institution: University of California, San Diego Contact: ! Y or N (designate at most one contact) CoI_Name: Lin Zuo CoI_Institution: University of California, San Diego Contact: ! Y or N (designate at most one contact) Abstract: Jakobsen et al 1994 have claimed the first detection of Gunn- Peterson absorption by He II in the diffuse intergalactic medium (IGM). Although likely, they are not certain that the absorption is from the IGM, and they are unsure how much of the absorption is due to He II in individual LymanAlpha clouds which are completely unresolved in their objective prism spectrum with 25 Angstrom resolution. We will obtain spectra of one QSOs with three goals. (1) The spectrum of the QSO will have SNR=10 per 0.57Angstrom, which is enough that we can separate out absorption due to He II in LyAlpha forest lines and diffuse IGM absorption. We should be able to measure Tau _GP, which gives part of the spectrum of the ionizing radiation. (2) We will have the spectral resolution and SNR to see that the GP absorption does not begin for some distance away from the QSO, because it is surrounded by a Stromgren sphere of high ionization. The extent of this sphere depends on the intensity and shape of the spectra of ionizing radiation, both from the QSOs and in the IGM in general. (3) If the sources of energy for the re-ionization of the IGM were relatively scarce (major explosions, QSOs) the IGM will not all be of the same ionization, and we should see less GP absorption in some places in the spectrum. Questions ! Free format text (please update) Observing_Description: We will observe the QSO 1935-69 for the full 16 orbits allocated to us. We will use the HRS in ACCUM mode with the G140L grating. We are using FOS for the ACQ because the object is so faint. Real_Time_Justification: Calibration_Justification: ! Move appropriate text from Real_Time_Justification Additional_Comments: Fixed_Targets ! Section 5.1 Target_Number: 1 Target_Name: QSO-194025-690756 Alternate_Names: QSO1935-692 Description: GALAXY, Quasar, Lyman Alpha Cloud Position: RA = 19H 40M 25.57S +/- 0.1S, DEC = -69D 7' 56.00" +/- 1.0", PLATE-ID = 01CB ! Most common specification format is ! RA=0H 0M 0.00S +/- 0S, ! DEC=0D 0' 0.0" +/- 0", ! PLATE-ID=0000 Equinox: J2000 RV_or_Z: Z = 3.170 RA_PM: ! Units are seconds of time per year Dec_PM: ! Units are seconds of arc per year Epoch: Annual_Parallax: Flux: V=17.26 +/- 0.5 ! Include at least V and B-V Comments: ! This is a template for a single visit containing a single exposure ! Repeat exposure and visit blocks as needed Visits ! Section 6 !VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV Visit_Number: 1 Visit_Requirements: ! Section 7.1 ! Uncomment or copy visit level special requirements needed ! Most of these requirements (including ORIENT) will limit scheduling PCS MODE F ! GUIDing TOLerance ! ORIENTation TO ! ORIENTation TO FROM ! ORIENTation TO FROM NOMINAL ! SAME ORIENTation AS CVZ ! PARallel ! AFTER [BY [TO ]] ! AFTER ! BEFORE ! BETWEEN AND ! GROUP WITHIN