8388(  2) - 12/18/98 16:56  - [  1]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      8388
                                                       Version: 2
                                                       Check-in Date: 18-Dec-1998
                                                                      16:55:26

1.Proposal Title:
Locating Compact Ly-alpha Emitting Galaxies at z=2.3--2.8: Analysis of Archival
WFPC2 Medium-band Images
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2. Proposal For  3. Cycle
AR               8
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4. Investigators
                                                                                     Contact?
    PI: Rogier Windhorst                  Arizona State University
   CoI: Dr. Sebastian Pascarelle          State University of New York at Stony         N
                                          Brook
   CoI: Mr. Seth Cohen                    Arizona State University                      N
   CoI: Mr. Ian Waddington                Arizona State University                      N

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5. Abstract

\n Medium-band imaging with HST/WFPC2 in the F410M filter has previously revealed a
population of faint compact Lyman-Alpha emitters at z~eq 2.4 around the radio galaxy
53W002 and in three random parallel F410M fields (Pascarelle Etal 1996, 1998). We
propose to analyze a dozen Cycle 7+8 WFPC2 fields in F410M and F467M to do a
systematic search for compact Ly- alpha emitting objects at z~2.3--2.9. Several new
deep observations in F410M and F467M are in the Archive, and several more \cge 5--8
orbit parallels are planned in these filters for Cycles 7+8. With this data set, we
will address the following science goals: bullet (1) Find ~100 faint compact Ly-
alpha emitting objects (in groups or filaments) at z=2.37+/-0.06 (F410M) & z=2.85+/-
0.07 (F467M), and confirm their redshifts with the 6.5m MMT. bullet (2) Determine
the luminosity function of the compact emission line objects and constrain the
luminous mass spectrum at z~eq2.3--2.9. bullet (3) Determine the size distribution
of these compact emission line objects and compare them to the sizes of galaxies
seen today; bullet (4) Determine whether or not the variations in number counts from
field to field of the compact Ly-alpha emitters found in previous observations are
statistically significant; bullet (5) Determine their galaxy types, Ly- alpha
fluxes, AGN fractions, and constrain their SFR.
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  Data Distribution

  Paper Products:  NO
  Media:           ELECTRONIC
  Blocking Factor: 10
  Ship To:         PI_Address
  Ship Via:
  Email:
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                                                8388(  2) - 12/18/98 16:56  - [  2]

            Summary Form for Proposal  8388

  Item                         Used in this proposal
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  Proposal Category            AR
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