Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.3305b&link_type=abstract
American Astronomical Society, HEAD meeting #12, #33.05
Astronomy and Astrophysics
Astronomy
Scientific paper
In globular clusters, dynamical evolution produce luminous X-ray emitting binaries at a rate hundreds of times greater than in the field. If globular clusters also produce SN Ia's at a high rate, it would account for most of the SN Ia production in early type galaxies and provide insight into their formation. We used archival HST images of nearby galaxies that have hosted a SNIa to examine the rate at which globular clusters produce these events. The location of the SN Ia is registered on an HST image obtained before the event or after the supernova faded. Of the 36 nearby galaxies examined, 18 had sufficiently good data to search for globular cluster hosts. None of the 18 supernova unambiguously have a globular cluster counterpart, although there are a few possible candidates. This places an upper limit to the enhancement rate of SN Ia production in globular clusters of about 60, significantly lower than the enhancement rate for luminous X-ray binaries. We conclude that globular clusters are not responsible for producing a significant fraction of the SN Ia events in early-type galaxies.
Bregman Joel Norman
Washabaugh Pearce
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