! Proposal 6570, submission 1 ! PI: Mauro Giavalisco ! Received Fri Apr 26 15:33:30 EDT 1996 ! From: mauro@ociw.edu ! Hubble Space Telescope Cycle 6 (1996) Phase II Proposal Template ! $Id: 6570,v 4.1 1996/10/21 19:59:12 pepsa Exp $ ! Hubble Space Telescope Cycle 6 (1996) Phase II Proposal Template ! $Id: 6570,v 4.1 1996/10/21 19:59:12 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: van Orsow ! Phone: 410-338-4568 , E-mail: vanorsow@stsci.edu ! ! This partially completed template was generated from a Phase I proposal. ! Name of Phase I Proposal: archive-0453.giavalisco.prop ! Date generated: Fri Dec 22 18:49:04 EST 1995 ! Proposal_Information ! Section 4 Title: High-Redshift Galaxies and Their Contribution to the Ionizing Background Proposal_Category: GO Scientific_Category: INTERSTELLAR MEDIUM Cycle: 6 Investigators PI_name: Mauro Giavalisco PI_Institution: The Observatories of the Carnegie Institution of Washington CoI_Name: Ray Weymann CoI_Institution: The Observatories of the Carnegie Institution Contact: Y ! Y or N (designate at most one contact) CoI_Name: Simon Lilly CoI_Institution: University of Toronto Contact: N ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) We propose objective-prism spectroscopy with the FOC-F/96 + FUVOP of a well-controlled sample of 10 blue galaxies at redshifts ~ 1, to study their UV spectral energy distribution, from shortward of the Lyman limit to longward of Ly-alpha. Aim of the project is to investigate on 1) the contribution by star-forming galaxies at half the Hubble time to the ionizing background; 2) the star-formation activity in these galaxies. This data bears on several key issues, including galaxy formation and evolution, the physical state of gas in protogalaxies and the degree of ionization of the QSO absorption systems. The sample is selected from the statistically-complete Canada-France Redshift Survey for having I_AB<22 and (U-I)_AB<1.4, corresponding to the color of a present-day Sbc galaxy, and includes galaxies in the range 0.8<~ z<~ 1.1. Among these there are the blue galaxies with peculiar morphology and enhanced star-formation activity which dominate the faint counts. Several reasons suggest that these galaxies could be important contributors of UV ionizing radiation. From the FOC UV data we will measure, or set tight limits on, the flux of ionizing photons, and, by combining the UV spectra of the galaxies with existing optical spectroscopy, photometry and WFPC2 morphology, will obtain quantitative information on the initial mass-function, star-formation rate and structure of the ISM, which is essential to reconstruct the evolutionary history of the faint blue galaxies to the present epoch. Questions ! Free format text (please update) Observing_Description: centerline 1. Why HST? We want to carry out spectroscopy of relatively faint galaxies at redshifts z<~ 1, covering the wavelength range from shortward of the Lyman break to longward of Ly-alpha, approximately LambdaLambda 1500--2500 Angstrom. Our galaxies have apparent magnitudes in the range 21<~ m_V<~ 23 with very blue f_Nu spectra (spectral indexes in the range 0 ! DROP TO GYRO IF NECESSARY [NO REACQuisition] ! ORIENTation TO ! ORIENTation TO FROM ! ORIENTation TO FROM NOMINAL ! SAME ORIENTation AS ! CVZ ! PARallel ! SCHEDulability ! AFTER [BY [TO ]] ! AFTER ! BEFORE ! BETWEEN AND ! GROUP WITHIN