Mathematics – Logic
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21711201d&link_type=abstract
American Astronomical Society, AAS Meeting #217, #112.01; Bulletin of the American Astronomical Society, Vol. 43, 2011
Mathematics
Logic
Scientific paper
Because they are so bright, Type Ia Supernovae (SNeIa) are probably the most accurate distance indicators on cosmological scales. And, although SNeIa are not equally bright, they are standardizable candles through the known correlation between their peak brightness and the width of their light curves. However, the correlation fails for some SNeIa which can appear dimmer and redder either because of host galaxy dust extinction or perhaps due to intrinsic properties. We have undertaken a study to examine the effects of dust on SNe Ia observations, including investigating possible differences between the dust properties in galaxies, both nearby and at high redshifts. One of our goals with this study is to investigate the uncertainties on SN Ia extinction values using multicolor data of nearby galaxies. We have taken advantage of
The Spitzer Infrared Nearby Galaxies Survey (SINGS), a comprehensive study of 75 nearby galaxies (Kennicutt et al. 2003) with good estimates of their dust masses (Draine et al. 2007). We combine this date with SNe Ia templates to bound the effects of extinction. To investigate high redshift galaxy dust properties in high-z galaxies we compare the simulated spectra to the PHASE extracted data set of 139 spectra of 124 Type Ia supernovae obtained at the VLT during the first three years of the CFHT Supernova Legacy Survey (Balland et al).
We discuss the methods used in our simulations and the significance of the results of this study based on comparing computed extinction for template spectra to published observational data of low and high redshift SNe Ia.
Cikota Aleksandar
Deustua Susana E.
Gordon Karl
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