**AAS 203rd Meeting, January 2004**

*Session 45 Supernovae*

Poster, Tuesday, January 6, 2004, 9:20am-6:30pm, Grand Hall
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## [45.06] High Redshift Supernova Rates in the GOODS Fields

*T. Dahlen, L. -G. Strolger, A. G. Riess, B. Mobasher (STScI), R. Chary, C. J. Conselice (CalTech), H. C. Ferguson, A. S. Fruchter, M. Giavalisco, M. Livio (STScI), P. Madau (UCSC), N. Panagia (STScI), J. L. Tonry (U. Hawaii), GOODS Team*

The Great Observatories Deep Origins Survey (GOODS)
discovered a total of 42 supernovae (SNe) with mean redshift
z~0.8 in CDF-S and HDF-N. Using all available
information, including redshifts, light curve decline,
magnitudes and colors, we classify 16 of these as core
collapse SNe (type II and Ib/c), with the remaining being
type Ia SNe (Strolger et al. 2003, in preparation).

We calculate the rate of core collapse SNe at redshifts
z~0.3 and z~0.7 (given as the number of exploding
SNe per year per cubic Mpc in comoving units). We find that
the rates at these redshifts are significantly higher than
the rate measured locally. As core collapse SNe originate
from short-lived massive progenitor stars, their rate
provides an independent method for estimating the cosmic
star formation rate. The steep increase with redshift in the
core collapse SN rate is consistent with the increase (by a
factor ~10) in the star formation rate to redshift
z~1 found by independent measurements (e.g.,
UV-luminosity densities).

Rates of Ia SNe have previously been measured to redshifts
z~0.5. While the rates at z~0.5 were somewhat
higher than local rates, these measurements are still
consistent with a flat SN Ia rate in the redshift range
probed. Using our unique sample of Ia SNe, we estimate the
SN Ia rate to z~2. We find a rate at z~1 that is
clearly higher than previous measurements at lower redshift,
seemingly inconsistent with a constant rate over the
redshift range 0 < z < 1. At higher redshifts (z > 1),
we find that the SN Ia rate is constant or slightly
decreasing.

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

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Bulletin of the American Astronomical Society, **35**#5

© 2003. The American Astronomical Soceity.