7541(  1) - 12/14/96 00:51  - [  0]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      7541
                                                       Version: 1
                                                       Check-in Date: 13-Dec-1996
                                                                      18:20:12

1.Proposal Title:
The nature of the extragalactic UV background
------------------------------------------------------------------------------------
2. Scientific Category   3. Proposal For  4. Cycle
COSMOLOGY                   AR               7
------------------------------------------------------------------------------------
5. Investigators
                                                                                     Contact?
    PI: Michael Shara                     Space Telescope Science Institue
   CoI: Noah Brosch                       Tel Aviv University                           N
   CoI: David Zurek                       Space Telescope Science Institute             N

------------------------------------------------------------------------------------
6. Abstract

Recent analyses indicate discrepancies between measured upper limits for the diffuse
UV background and predicted values from unresolved or very faint extragalactric
source contributions. We will perform an archival study of WFPC2 UV images (F160BW
and F218W) to study this question. Specifically, we shall identify systematically
all the sources in these images, and shall determine the level of the diffuse UV
background in both bands. The latter, in conjunction with available HI and/or FIR
data, will yield the level of the extragalactic UV background, or the best limit
yet.
------------------------------------------------------------------------------------
  Data Distribution

  Media:           ELECTRONIC
  Blocking Factor: 10
  Ship To:         PI_Address
  Ship Via:
  Email:                                                              ,
------------------------------------------------------------------------------------

                                                7541(  1) - 12/14/96 00:51  - [  1]

            Summary Form for Proposal  7541

  Item                         Used in this proposal
------------------------------------------------------------------------------------------------------------------------------------
  Proposal Category            AR
------------------------------------------------------------------------------------------------------------------------------------
  Scientific Category          COSMOLOGY
------------------------------------------------------------------------------------------------------------------------------------