Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21331205g&link_type=abstract
American Astronomical Society, AAS Meeting #213, #312.05; Bulletin of the American Astronomical Society, Vol. 41, p.289
Astronomy and Astrophysics
Astronomy
Scientific paper
For more than a decade observations and analyses of type Ia supernova have resulted in profound insights into the nature of our universe. However, in spite of the amazing discoveries, the list of fundamental things that we still do not understand about SNe Ia is quite long. We attempt to address a few of these questions through an analysis of the galaxies in which they are hosted. Our analysis is broken up into two studies, the first study focuses on late type, star forming galaxies, while the second on early type galaxies. For our SF hosts we deduce from the spectra the metallicity, current star formation rate, and star formation history of the host and compare these to the supernova decline rates. Our results indicate a statistically insignificant correlation in the direction that higher metallicity spiral galaxies host fainter type Ia supernovae. However, we present qualitative evidence suggesting progenitor age is more likely to be the source of variability in supernova peak luminosities than is metallicity. In our study of early type host galaxies, our narrow focus allows for the simultaneous measurement of both global age and metallicity, further enabling a direct identification of possible dependences between both SN peak magnitude and Hubble Residual on host galaxy age and metallicity. We find evidence for either or both age and metallicity effecting the peak V-band magnitudes of SNe Ia, and we discuss the difficulty in differentiating between a real correlation and one arising from the degeneracy of age and metallicity. Our Hubble residual analysis in both studies found higher metallicity environments producing under-luminous SNe. In the case of early type hosts a no correlation result is ruled out at the 98% confidence level, suggesting metallicity has a secondary impact on SN luminosity left uncorrected by light-curve shape correction.
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