THE EFFECT OF HOST GALAXIES ON TYPE Ia SUPERNOVAE IN THE SDSS-II SUPERNOVA SURVEY
- Institute of Cosmology and Gravitation, University of Portsmouth, Portsmouth, PO1 3FX (United Kingdom)
- South African Astronomical Observatory, P.O. Box 9, Observatory 7935 (South Africa)
- Department of Physics and Astronomy, Wayne State University, Detroit, MI 48202 (United States)
- Department of Physics and Astronomy, Rutgers the State University of New Jersey, Piscataway, NJ 08854 (United States)
- Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
- Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL 60637 (United States)
- Department of Physics, University of Notre Dame, Notre Dame, IN 46556 (United States)
- The Oskar Klein Centre fro Cosmoparticle Physics, Department of Physics, Albanova Stockholm University, SE-106 91 Stockholm (Sweden)
- CEOU Department of Physics and Astronomy, Seoul National University, Seoul (Korea, Republic of)
- Fermilab, P.O. Box 500, Batavia, IL 60510 (United States)
- Institucio Catalana de Recerca i Estudis Avancats, E-08010 Barcelona (Spain)
- Institut de Fisica d'Altes Energies, E-08193 Bellaterra (Barcelona) (Spain)
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218 (United States)
- Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104 (United States)
- Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802 (United States)
- Department of Astronomy, Stockholm University, SE-106 91 Stockholm (Sweden)
We present an analysis of the host galaxy dependences of Type Ia Supernovae (SNe Ia) from the full three year sample of the SDSS-II Supernova Survey. We re-discover, to high significance, the strong correlation between host galaxy type and the width of the observed SN light curve, i.e., fainter, quickly declining SNe Ia favor passive host galaxies, while brighter, slowly declining Ia's favor star-forming galaxies. We also find evidence (at between 2{sigma} and 3{sigma}) that SNe Ia are {approx_equal}0.1 {+-} 0.04 mag brighter in passive host galaxies than in star-forming hosts, after the SN Ia light curves have been standardized using the light-curve shape and color variations. This difference in brightness is present in both the SALT2 and MCLS2k2 light-curve fitting methodologies. We see evidence for differences in the SN Ia color relationship between passive and star-forming host galaxies, e.g., for the MLCS2k2 technique, we see that SNe Ia in passive hosts favor a dust law of R{sub V} = 1.0 {+-} 0.2, while SNe Ia in star-forming hosts require R{sub V} = 1.8{sup +0.2}{sub -0.4}. The significance of these trends depends on the range of SN colors considered. We demonstrate that these effects can be parameterized using the stellar mass of the host galaxy (with a confidence of >4{sigma}) and including this extra parameter provides a better statistical fit to our data. Our results suggest that future cosmological analyses of SN Ia samples should include host galaxy information.
- OSTI ID:
- 21464680
- Journal Information:
- Astrophysical Journal, Vol. 722, Issue 1; Other Information: DOI: 10.1088/0004-637X/722/1/566; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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