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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Spectroscopic properties of star-forming host galaxies and type Ia supernova Hubble residuals in a nearly unbiased sample
Astrophysical Journal, Volume 743, No. 2, Article 172, Year 2011
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Description
We examine the correlation between supernova (SN) host-galaxy properties and their residuals in the Hubble diagram. We use SNe discovered during the Sloan Digital Sky Survey-II Supernova Survey, and focus on objects at a redshift of z < 0.15, where the selection effects of the survey are known to yield a complete Type Ia supernova (SNIa) sample. To minimize the bias in our analysis with respect to measured host-galaxy properties, spectra were obtained for nearly all hosts, spanning a range in magnitude of -23 < Mr < -17. In contrast to previous works that use photometric estimates of host mass as a proxy for global metallicity, we analyze host-galaxy spectra to obtain gas-phase metallicities and star formation rates (SFRs) from host galaxies with active star formation. From a final sample of ∼40 emission-line galaxies, we find that light-curve-corrected SNe Ia are ∼0.1mag brighter in high-metallicity hosts than in low-metallicity hosts. We also find a significant (>3σ) correlation between the Hubble Residuals of SNe Ia and the specific SFR of the host galaxy. We comment on the importance of SN/host-galaxy correlations as a source of systematic bias in future deep SN surveys. © 2011 The American Astronomical Society. All rights reserved.
Authors & Co-Authors
D'Andrea, Chris B.
United States, Philadelphia
University of Pennsylvania
United Kingdom, Portsmouth
University of Portsmouth
Gupta, Ravi R.
United States, Philadelphia
University of Pennsylvania
Sako, Masao
United States, Philadelphia
University of Pennsylvania
Morris, Matt
United States, Philadelphia
University of Pennsylvania
United States, Baltimore
Johns Hopkins University
Nichol, Robert C.
United Kingdom, Portsmouth
University of Portsmouth
Brown, Peter J.
United States, Salt Lake City
The University of Utah
Campbell, Heather C.
United Kingdom, Portsmouth
University of Portsmouth
Olmstead, Matthew D.
United States, Salt Lake City
The University of Utah
Frieman, Joshua A.
United States, Chicago
The Kavli Institute for Cosmological Physics
United States, Chicago
The University of Chicago
United States, Batavia
Fermi National Accelerator Laboratory
Garnavich, Peter M.
United States, New Brunswick
Rutgers University–new Brunswick
Jha, Saurabh W.
United States, Notre Dame
University of Notre Dame
Kessler, Richard S.
United States, Chicago
The Kavli Institute for Cosmological Physics
United States, Chicago
The University of Chicago
Lampeitl, Hubert
United Kingdom, Portsmouth
University of Portsmouth
Marriner, John P.
United States, Batavia
Fermi National Accelerator Laboratory
P. Schneider, Donald P.
United States, University Park
Pennsylvania State University
Smith, Matthew W.L.
South Africa, Cape Town
University of Cape Town
Statistics
Citations: 59
Authors: 16
Affiliations: 11
Identifiers
Doi:
10.1088/0004-637X/743/2/172
ISSN:
0004637X
e-ISSN:
15384357
Research Areas
Environmental
Study Design
Cross Sectional Study
Study Approach
Quantitative