9932(  1) - 04/04/03 10:22  - [  1]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      9932
                                                       Version: 1
                                                       Check-in Date: 04-Apr-2003
                                                                      10:22:12

1.Proposal Title:
The Globular Cluster-Low Mass X-ray Binary Connection in Nearby Early-type Galaxies:
An Archival Study
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2. Proposal For  3. Cycle
AR               11
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4. Investigators
                                                                                     Contact?
    PI: Jimmy Irwin                       University of Michigan
   CoI: Prof. Joel Bregman                University of Michigan                        N

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5. Abstract

It is well-established that low-mass X-ray binaries (LMXBs) are far more likely to
form per unit light in globular clusters than in the field, probably the result of
an increased rate of stellar interactions in the cores of globulars. Recent studies
have indicated that 30%-70% of LMXBs in early-type galaxies are located within
globular clusters. We propose an archival study of 23 nearby early-type galaxies
observed with WFPC2 and ACS in order to compile globular cluster lists for these
galaxies for comparison to LMXB positions determined by Chandra. With these lists,
we will determine the percent of LMXBs within globular clusters and the effects that
age and metallicity have on LMXB formation. The ~700 LMXBs in our sample will vastly
improve the statistics of these quantities compared to individual galaxy studies.
With these quantities, we will (1) determine whether all LMXBs form within
globulars, and (2) estimate the lifetime of LMXBs.
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                                                9932(  1) - 04/04/03 10:22  - [  2]

            Summary Form for Proposal  9932

  Item                         Used in this proposal
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  Proposal Category            AR
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