Proposal_Information

              Title: Ne VIII Emission in the QSO PG 1148+549
  Proposal_Category: GTO/FOS
Scientific_Category: Quasars
              Cycle: 5


Investigators

        PI_name: E. MARGARET BURBIDGE
 PI_Institution: UNIVERSITY OF CALIFORNIA, SAN DIEGO

       CoI_Name: RICHARD J. HARMS
CoI_Institution: APPLIED RESEARCH CORPORATION

       CoI_Name: J. ROGER P. ANGEL
CoI_Institution: UNIVERSITY OF ARIZONA

       CoI_Name: FRANK BARTKO
CoI_Institution: UNAFFILIATED

       CoI_Name: EDWARD BEAVER
CoI_Institution: UNIVERSITY OF CALIFORNIA, SAN DIEGO

       CoI_Name: RALPH C. BOHLIN
CoI_Institution: SPACE TELESCOPE SCIENCE INSTITUTE

       CoI_Name: ARTHUR F. DAVIDSEN
CoI_Institution: JOHNS HOPKINS UNIVERSITY

       CoI_Name: HOLLAND C. FORD
CoI_Institution: SPACE TELESCOPE SCIENCE INSTITUTE

       CoI_Name: GEORGE F. HARTIG
CoI_Institution: SPACE TELESCOPE SCIENCE INSTITUTE

       CoI_Name: BRUCE H. MARGON
CoI_Institution: UNIVERSITY OF WASHINGTON


Abstract:
UV spectra of the bright QSO PG 1148+549 (V=15.8, z=0.978) will be obtained to study
the far UV emission lines.  Low resolution IUE spectra show an emission line at the
expected location of Ne VIII 770,780 emission.  Ne VIII emission must come from a
region of very high ionization and small Lyman continuum optical depth.  The
presence of Ne VIII emission could indicate a new emission component in the broad
emission line region of QSOs beyond the conventional optically thick emission line
clouds.  These observations will also be used to measure the Ly alpha forest
absorption near z = 1.


Questions

Observing_Description:
We will use FOS/BL and the G130H, G190H, and G270H gratings to obtain spectra with
complete wavelength coverage from ~1200 to ~3300 Angstrom in one QSO. We will use
the Binary Search acquisition and the 1.0" aperture. We will use only FOS/BL
(instead of FOS/RD for the G190H and G270H settings) because a side switch is too
time consuming. For the exposure times given below, we expect SNRs per diode of ~15
for G130H and G190H and 25 for G270H (based on fluxes measured with the IUE) and
the count rates given in version 5.0 of the FOS Manual (Fig. 1.2.3). 

Real_Time_Justification:
None.

Calibration_Justification:
We request that wavelength calibration lamps be taken with F190H and G130H grating
settings to minimize the wavelength uncertainties caused by grating shifts. We
request that the lamp exposures be obtained DURING OCCULTATION to maximize the
science target exposure times. 


Fixed_Targets

Target_Number: 1
  Target_Name: PG1148+549
  Description: GALAXY, Quasar, BLR
     Position: RA=11H 51M 20.44S +/- 0.3S,
               DEC=54D 37' 32.8" +/- 0.5",
               PLATE-ID=00LK
      Equinox: 2000
      RV_or_Z: Z=0.97
         Flux: V=15.82, B-V=0.3
               F-CONT(800) = 1.0 +/- .4 E-14
               F-CONT(1550) = 5.3 +/- .3 E-15


Visits

Visit_Number: 1

     Exposure_Number: 1
         Target_Name: PG1148+549
              Config: FOS/BL
              Opmode: ACQ/BINARY
            Aperture: 4.3
          Sp_Element: MIRROR
Number_of_Iterations: 1
   Time_Per_Exposure: 15S
Special_Requirements: ONBOARD ACQ FOR 2-7

     Exposure_Number: 2
         Target_Name: PG1148+549
              Config: FOS/BL
              Opmode: ACCUM
            Aperture: 1.0
          Sp_Element: G130H
          Wavelength: 1200-1600
Number_of_Iterations: 1
   Time_Per_Exposure: 1570S
Special_Requirements: EXPAND

     Exposure_Number: 3
         Target_Name: WAVE
              Config: FOS/BL
              Opmode: ACCUM
            Aperture: 1.0
          Sp_Element: G130H
          Wavelength: 1200-1600
Number_of_Iterations: 1
   Time_Per_Exposure: DEF

     Exposure_Number: 4
         Target_Name: PG1148+549
              Config: FOS/BL
              Opmode: ACCUM
            Aperture: 1.0
          Sp_Element: G130H
          Wavelength: 1200-1600
Number_of_Iterations: 1
   Time_Per_Exposure: 970S
Special_Requirements: EXPAND

     Exposure_Number: 5
         Target_Name: PG1148+549
              Config: FOS/BL
              Opmode: ACCUM
            Aperture: 1.0
          Sp_Element: G270H
          Wavelength: 2300-3250
Number_of_Iterations: 1
   Time_Per_Exposure: 350S
Special_Requirements: MAX DUR 150%

     Exposure_Number: 6
         Target_Name: PG1148+549
              Config: FOS/BL
              Opmode: ACCUM
            Aperture: 1.0
          Sp_Element: G190H
          Wavelength: 1580-2330
Number_of_Iterations: 1
   Time_Per_Exposure: 750S
Special_Requirements: MAX DUR 150%

     Exposure_Number: 7
         Target_Name: WAVE
              Config: FOS/BL
              Opmode: ACCUM
            Aperture: 1.0
          Sp_Element: G190H
          Wavelength: 1580-2330
Number_of_Iterations: 1
   Time_Per_Exposure: DEF


Data_Distribution

         Medium: 8MM
Blocking_Factor: 10
        Ship_To: ROSS COHEN
                 CASS 0111
                 9500 GILMAN DRIVE
                 LA JOLLA, CA 92093-0111
       Ship_Via: UPS
Recipient_Email: ross@cassfos03.ucsd.edu