! Proposal 5826, submission 1 ! PI: David V. Bowen ! Received Mon Mar 13 12:42:45 EST 1995 ! From: bowen@stsci.edu ! Hubble Space Telescope Cycle 5 (1995) Phase II Proposal Template ! $Id: 5826,v 5.1 1995/11/22 16:38:16 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: Andy Lubenow ! Phone: 410 338-4928 , E-mail: lubenow@stsci.edu ! ! This partially completed template was generated from a Phase I proposal. ! Name of Phase I Proposal: bowen-684.prop ! Date generated: Fri Dec 16 14:32:40 EST 1994 ! Proposal_Information ! Section 4 Title: Investigating Dwarf Galaxy Formation and Evolution Searching for Diffuse Ionized Gas Around Leo I Proposal_Category: GO Scientific_Category: Galaxies & Clusters Cycle: 5 Investigators PI_name: David V. Bowen PI_Institution: Space Telescope Science Institute CoI_Name: Eline Tolstoy CoI_Institution: Kapteyn Astronomical Institute Contact: ! Y or N (designate at most one contact) CoI_Name: J. Chris Blades CoI_Institution: Space Telescope Science Institute Contact: ! Y or N (designate at most one contact) CoI_Name: Elias Brinks CoI_Institution: NRAO Contact: ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) We propose searching for the remnants of dwarf galaxy formation and evolution by looking for tenuous amounts of metal enriched gas in the outer regions of the dwarf galaxy Leo I. We have found 3 QSOs and AGNs 2.1, 3.7 & 8.1 kpc from the center of the galaxy, and wish to search for C IV, Si IV & Si II absorption lines from gas around the galaxy. We have observed one QSO previously with HST and found no Mg II at the redshift of Leo I, which suggests that any gas which lies outside the galaxy is highly ionized, either by the UV background or by the physical processes which placed the gas there initially. If so, C IV & Si IV are ideal transitions with which to search for such gas. We wish to search for these lines to determine the existence of gas around the galaxy, gauge the total extent of the gas and its covering factor, detect variations in line strength and ionization (as measured from the Si II/Si IV ratio) with radius, and search for large scale kinematic variations in the absorbing gas which may be indicative of gas outflows or expanding shells. Many models of dwarf galaxy formation and evolution implicitly assume that gas either escapes or falls into the galaxy; this proposal explicitly tests that assumption. Questions ! Free format text (please update) Observing_Description: The observations of 3 sightlines with the G140L will cover a wavelength range which includes Si IV, C IV, and Si II absorption lines, as well as C II and Ni II lines. The AGN are compact and at low redshift, which has the advantage that no higher redshift Lyman limit system will cut off the UV flux. Exposure times are estimated either from known UV fluxes, or from V magnitudes extrapolated to 1400 Angstrom\ assuming the object has a power law of the form F_Nu \propto\ nu^-1. Exposure times are calculated to give a S/N of 18 per pixel for half-stepped data. Assuming a background count rate of 36 counts/diode/hr, the S/N gives a 3Sigma equivalent width limit of 0.1 Angstrom\ for a resolving power of 2150 at Si IV and 0.15 Angstrom\ at C IV These limits are sufficient to detect absorption lines from our own Galactic halo, W(Si IVLambda1393)= 0.2 Angstrom , W(C IVLambda1548)= 0.3 Angstrom . The high S/N ensures that absorption from Leo I will be clearly resolved from local Milky Way absorption lines, which will allow accurate line centers, equivalent widths etc. to be determined. Real_Time_Justification: Calibration_Justification: ! Move appropriate text from Real_Time_Justification Additional_Comments: Fixed_Targets ! Section 5.1 Target_Number:1 Target_Name:1004+1303 Alternate_Names: Description:GALAXY,QSO;EXT-MEDIUM,absorption line system Position:RA=10H 07M 26.10S +/- 0.6S, DEC=12D 48' 56.0" +/- 0.6", PLATE-ID=028W Equinox:J2000.0 RV_or_Z:z=0.240 RA_PM: ! Units are seconds of time per year Dec_PM: ! Units are seconds of arc per year Epoch: Annual_Parallax: Flux:V=15.15,F(1400)=0.8e-14 Comments: Target_Number:2 Target_Name:1008+1319 Alternate_Names: Description:GALAXY,QSO;EXT-MEDIUM,absorption line system Position:RA=10H 11M 10.84S +/- 1.0S, DEC=13D 04' 11.7" +/- 1.0", PLATE-ID=028W Equinox:J2000.0 RV_or_Z:z=1.287 RA_PM: ! Units are seconds of time per year Dec_PM: ! Units are seconds of arc per year Epoch: Annual_Parallax: Flux:V=16.29 Comments: Target_Number:3 Target_Name:0957+1317 Alternate_Names:NGC3080,Mrk1243,UGC5372 Description:GALAXY,seyfert;EXT-MEDIUM,absorption line system Position:RA=09H 59M 55.86S +/- 0.6S, DEC=13D 02' 37.2" +/- 0.6", PLATE-ID=028W Equinox:J2000.0 RV_or_Z:z=0.035 RA_PM: ! Units are seconds of time per year Dec_PM: ! Units are seconds of arc per year Epoch: Annual_Parallax: Flux:V=15.15 ! Include at least V and B-V Comments:UV excess galaxy ! This is a template for a single visit containing a single exposure ! Repeat exposure and visit blocks as needed Visits ! Section 6 Visit_Number:1 Visit_Requirements: ! Section 7.1 On_Hold_Comments: Visit_Comments: Exposure_Number:10 Target_Name:1004+1303 Config:HRS Opmode:ACQ Aperture:2.0 Sp_Element:MIRROR-N1 Wavelength: Optional_Parameters:bright=return;search-size=3 Number_of_Iterations:1 Time_Per_Exposure:90s Special_Requirements:ONBOARD ACQUISITION FOR 20 ! END ORBIT Comments:step-time=10s Exposure_Number:20 Target_Name:1004+1303 Config:HRS Opmode:ACCUM Aperture:2.0 Sp_Element:G140L Wavelength:1421 Optional_Parameters:fp-split=two Number_of_Iterations:27 Time_Per_Exposure:217.6s Special_Requirements: ! Second: 1008+1319 Visits ! Section 6 Visit_Number:2 Visit_Requirements: ! Section 7.1 On_Hold_Comments: Visit_Comments: Exposure_Number:30 Target_Name:1008+1319 Config:HRS Opmode:ACQ Aperture:2.0 Sp_Element:MIRROR-N1 Wavelength: Optional_Parameters:bright=return;search-size=3 Number_of_Iterations:1 Time_Per_Exposure:90s Special_Requirements:ONBOARD ACQUISITION FOR 40 ! END ORBIT Comments:step-time=10s Exposure_Number:40 Target_Name:1008+1319 Config:HRS Opmode:ACCUM Aperture:2.0 Sp_Element:G140L Wavelength:1421 Optional_Parameters:fp-split=two Number_of_Iterations:27 Time_Per_Exposure:217.6s Special_Requirements: ! Third: 0957+1317 Visits ! Section 6 Visit_Number:3 Visit_Requirements: ! Section 7.1 On_Hold_Comments: Visit_Comments: Exposure_Number:50 Target_Name:0957+1317 Config:HRS Opmode:ACQ Aperture:2.0 Sp_Element:MIRROR-N1 Wavelength: Optional_Parameters:bright=return;search-size=3 Number_of_Iterations:1 Time_Per_Exposure:90s Special_Requirements:ONBOARD ACQUISITION FOR 60 ! END ORBIT Comments:step-time=10s Exposure_Number:60 Target_Name:0957+1317 Config:HRS Opmode:ACCUM Aperture:2.0 Sp_Element:G140L Wavelength:1421 Optional_Parameters:fp-split=two Number_of_Iterations:27 Time_Per_Exposure:217.6s Special_Requirements: Data_Distribution ! Defaults indicated; change if desired Medium: 8MM ! 8MM or 6250BPI or 1600BPI Blocking_Factor: 10 ! 10 or 1 ! Only astronomers with very old 9- ! track tape drives should consider ! a blocking factor of 1 Ship_To: stsci ! ! Ship_Via: Internal mail ! UPS (2-day) or OVERNIGHT Recipient_Email:!bowen@stsci.edu ! ! Let us know what you think of this template and software! ! Please send a list of your likes and dislikes to your Program Coordinator