The Nearby Galaxies Supernova Search project: The rate of supernovae in the local universe

Details The Nearby Galaxies Supernova Search project: The rate of supernovae in the local universe The Nearby Galaxies Supernova Search project: The rate of supernovae in the local universe

Publishing date

Aug 2003

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003phdt........14s&link_type=abstract

Journals

Thesis (PhD). UNIVERSITY OF MICHIGAN, Source DAI-B 64/02, p. 766, Aug 2003, 173 pages.

Science

Mathematics

Field

Logic

Additional info 2

12

Type

Scientific paper

Abstract

Over 2200 supernova events have been discovered in the past millenium—nearly half of which have been found in only the last decade. The rise in interest in these events has been sparked, in large part, by the sample of distant Type Ia supernovae which are giving unprecedented information about the cosmological parameters of our Universe. However, when one considers that very little is known about several SN Types including the Type Ia events, it is clear that there remains much to be understood in the detailed analysis of supernovae. Currently, this analysis is best done through relatively low redshift supernova surveys. Here I present the results from the Nearby Galaxies Supernova Search project (NGSS), a three-year survey for SNe in equatorial field galaxies. Through the bulk analysis of these SNe, I have determined the local SN rates in field galaxies (in Supernova Units [SNu]; Supernovae per century per 1010 LB&sun; ) to be 0.192 ± 0.045 (Poisson) ± 0.094 (systematic) for Type Ia SNe, 0.678 ± 0.164 ± 0.278 to 1.242 ± 0.301 ± 0.514 for Type II SNe, and 1.166 ± 0.178 ± 0.498 to 1.924 ± 0.293 ± 0.887 for all supernova types (depending on assumed intrinsic extinction distributions for core-collapse events). A small number of SNe from this survey were also attributed to Abell galaxy clusters. Although there was not a sufficient sample in which to draw conclusive rates, through simple assumptions about galaxy cluster mass, size, and luminosity parameters, I estimate the supernova rate to be 0.46 ± 0.14 (Poisson) to 0.84 ± 0.26 SNu in these environments (also dependent on extinction distributions). In the course of this survey, we discovered a number of rare SN types, including SN 1999aw, a SN 1999aa-like Type Ia in a very low-luminosity host galaxy. We have completed a very thorough analysis of this luminous and peculiar event, which I include in this dissertation. The NGSS project has successfully discovered one of the largest samples of SNe from a complete CCD-based survey of field galaxies. Further detailed analysis our data will produce very well sampled multipassband lightcurves, accurately determined SN types from early epoch spectra, and correlation studies of SN types with host galaxy environments.

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