AAS 203rd Meeting, January 2004
Session 45 Supernovae
Poster, Tuesday, January 6, 2004, 9:20am-6:30pm, Grand Hall

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[45.07] The Hubble Higher-z Supernova Search Project and the Promptness of SNe~Ia

L.-G. Strolger, A. Riess, T. Dahlen (Space Telescope Science Institute), Hubble Higher-z Supernova Search Team, GOODS Team

We have successfully conducted the first space-based survey for supernovae, differencing data from the GOODS deep galaxy survey (Giavalisco et al. 2003, in press). Searching in the F850lp passband, we have detected transients to a difference magnitude of mF850lp~26.0 to within 0.05 arcsec of host nuclei. Using a newly available color selection technique (Riess et al. 2003, in press), as well as spectroscopic identification whenever possible, we have confidently identified 26 SNe Ia and 16 core-collapse SNe to z=1.7.

For the first time, the rate of SNe Ia at zeff ~1 and greater is shown to be inconsistent with low redshift measurements (Dahlen et al. 2003, in preparation; Strolger et al. 2003, in preparation). The SN Ia rate should be tied to the cosmic star formation rate history with some characteristic delay time, from formation to explosion, which is a signature of their progenitor mechanism. We explore delay time distribution functions based on physical channels for SN Ia events. These distributions, when coupled with survey efficiencies and current measurements of the SFR history (Giavalisco et al. 2003b, in press) reproduce the SN Ia frequency distributions with redshift which are compared to the observed SN Ia distribution. An application of a maximum likelihood method shows which delay time function, characteristic delay, and physical model is favored.

The author(s) of this abstract have provided an email address for comments about the abstract: strolger@stsci.edu

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Bulletin of the American Astronomical Society, 35#5
© 2003. The American Astronomical Soceity.