Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21743429j&link_type=abstract
American Astronomical Society, AAS Meeting #217, #434.29; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the broadband FUV-K colors of stellar populations on the physical scale of 1-2 kpc, underlying historical supernovae Ia (SNe Ia) in the nearby Universe. The photometry was performed on GALEX and 2MASS images using 9” diameter apertures centered on regions of both elliptical and spiral galaxies with redshifts of z < 0.01. The colors are compared to the corresponding published Bmax-Vmax peak colors of the supernovae in order to determine whether a correlation exists between SN properties and underlying stellar population. A reddening trend is apparent in both faint and bright host stellar populations, such that redder peak SN colors come from redder populations, agreeing with host galaxy extinction estimates from the literature. In order to confirm that this trend is solely dependent on host galaxy dust, we examine the relatively dust-free J-K colors of the same regions. The added benefit of using the J-K color is that it is a strong indicator of metal abundance. We find that stellar populations hosting SNe with colors Bmax-Vmax < 0.3 have significantly bluer J-K colors and therefore are metal-poor in comparison to regions that hosted SNe with Bmax-Vmax > 0.3. These results suggest that SNe Ia peak colors are a function of their host stellar population metallicity and that many disk SNe Ia occur in regions of moderate reddening.
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