Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21110513d&link_type=abstract
American Astronomical Society, AAS Meeting #211, #105.13; Bulletin of the American Astronomical Society, Vol. 39, p.930
Astronomy and Astrophysics
Astronomy
Scientific paper
We present results from the HST/ACS high redshift supernova (SN) search in the two GOODS fields during Cycles 11, 12, and 13. In total, more than 50 Type Ia SNe were found and we use this sample to derive the Type Ia SN rate to z 1.6. Compared to our previously published results, based on Cycle 11 observations only, we have now increased the coverage of the search by a factor 2.7, making the total area searched equivalent to one square degree. The rates we derive are consistent with our original results. In particular, the few detected SNe at z > 1.4 supports our previous result that there is a drop in the Type Ia SN rate at high redshift. In contrast, a number of recent results based on e.g., low redshift SN samples and SN host galaxy properties suggest that a major fraction of the Type Ia SN rate should follow the star formation rate, while a smaller fraction of the rate is proportional to the old stellar population. While our results are fully consistent with this picture at low redshifts, the drop we find at z > 1.4 appears to contradict a SN rate that closely follows the star formation rate. Here we discuss possible ways to reconcile the discrepancies.
Dahlen Tomas
Riess Adam G.
Strolger Louis
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