The Young Metal-Poor Host Galaxy of the Super-Chandrasekhar Type Ia SN 2007if

Details The Young Metal-Poor Host Galaxy of the Super-Chandrasekhar Type Ia SN 2007if The Young Metal-Poor Host Galaxy of the Super-Chandrasekhar Type Ia SN 2007if

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21730804c&link_type=abstract

American Astronomical Society, AAS Meeting #217, #308.04; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present Keck LRIS spectroscopy and g-band photometry of the metal-poor, low-luminosity host galaxy of the super-Chandrasekhar mass Type Ia supernova SN 2007if. Deep imaging of the host reveals its absolute magnitude of Mg -14.5. Optical color and spectral indices measured from the stellar continuum constrain the mass-to-light ratio, giving a host stellar mass estimate of log(M/Msun) 7.5. These features also constrain the star-formation history of the galaxy, and show it to be dominated by a major starburst a few hundred Myr before the supernova itself. Using emission line fluxes from the spectrum, we determine the host metallicity to be very low (about 1/10th solar). Our data shows that SN 2007if, a key member of the emerging sub-class of probable super-Chandrasekhar mass SNe Ia, is very likely to have originated from a young metal-poor progenitor.

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