CORRELATIONS BETWEEN SDSS TYPE Ia SUPERNOVA RATES AND HOST GALAXY PROPERTIES
- Department of Physics and Astronomy, University of Victoria, P.O. Box 3055, STN CSC, Victoria, BC, V8W 3P6 (Canada)
Studying the correlation of Type Ia supernova rates (SNRs) with host galaxy properties is an important step in understanding the exact nature of Type Ia supernovae (SNe Ia). We use SNe Ia from the SDSS-II sample, spectroscopically determined masses and star formation rates, and a new maximum likelihood method, to fit the Scannapieco and Bildsten rate model SNR = A Multiplication-Sign M + B Multiplication-Sign SFR, where M is galaxy mass and SFR is star formation rate. We find A = 3.5{sup +0.9}{sub -0.7} Multiplication-Sign 10{sup -14} (SNe/yr)(M{sub Sun }){sup -1} and B = 1.3{sup +0.4}{sub -0.3} Multiplication-Sign 10{sup -3} (SNe/yr)(M{sub Sun} yr{sup -1}){sup -1}, assuming overall efficiency of 0.5. This is in reasonable agreement with other determinations. However we find strong evidence that this model is a poor fit to other projections of the data: it fails to correctly predict the distribution of supernovae with host mass or SFR. An additional model parameter is required; most likely this parameter is related to host galaxy mass. Some implications of this result are discussed.
- OSTI ID:
- 22130858
- Journal Information:
- Astronomical Journal (New York, N.Y. Online), Vol. 145, Issue 3; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1538-3881
- Country of Publication:
- United States
- Language:
- English
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