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Title:
Clustering of Supernova Ia Host Galaxies
Authors:
Carlberg, R. G.; Sullivan, M.; Le Borgne, D.; Conley, A.; Howell, D. A.; Perrett, K.; Astier, P.; Balam, D.; Balland, C.; Basa, S.; Hardin, D.; Fouchez, D.; Guy, J.; Hook, I.; Pain, R.; Pritchet, C. J.; Regnault, N.; Rich, J.; Perlmutter, S.
Affiliation:
AA(Department of Astronomy and Astrophysics, University of Toronto, Toronto, ON M5S 3H4, Canada; .), AB(Department of Astronomy and Astrophysics, University of Toronto, Toronto, ON M5S 3H4, Canada; .; University of Oxford Astrophysics, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK.), AC(DSM/IRFU, CEA/Saclay, 91191 Gif-sur-Yvette Cedex, France.), AD(Department of Astronomy and Astrophysics, University of Toronto, Toronto, ON M5S 3H4, Canada; .), AE(Department of Astronomy and Astrophysics, University of Toronto, Toronto, ON M5S 3H4, Canada; .), AF(Department of Astronomy and Astrophysics, University of Toronto, Toronto, ON M5S 3H4, Canada; .), AG(LPNHE, CNRS-IN2P3 and University of Paris VI and VII, 75005 Paris, France.), AH(Department of Physics and Astronomy, University of Victoria, P.O. Box 3055, Victoria, BC V8W 3P6, Canada.), AI(LPNHE, CNRS-IN2P3 and University of Paris VI and VII, 75005 Paris, France.), AJ(LAM CNRS, BP8, Traverse du Siphon, 13376 Marseille Cedex 12, France.), AK(LPNHE, CNRS-IN2P3 and University of Paris VI and VII, 75005 Paris, France.), AL(LPNHE, CNRS-IN2P3 and University of Paris VI and VII, 75005 Paris, France.), AM(LPNHE, CNRS-IN2P3 and University of Paris VI and VII, 75005 Paris, France.), AN(University of Oxford Astrophysics, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK.), AO(LPNHE, CNRS-IN2P3 and University of Paris VI and VII, 75005 Paris, France.), AP(Department of Physics and Astronomy, University of Victoria, P.O. Box 3055, Victoria, BC V8W 3P6, Canada.), AQ(LPNHE, CNRS-IN2P3 and University of Paris VI and VII, 75005 Paris, France.), AR(DSM/IRFU, CEA/Saclay, 91191 Gif-sur-Yvette Cedex, France.), AS(Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720.)
Publication:
The Astrophysical Journal, Volume 682, Issue 1, pp. L25-L28. (ApJ Homepage)
Publication Date:
07/2008
Origin:
UCP
ApJ Keywords:
Galaxies: General, Surveys
Abstract Copyright:
(c) 2008: The American Astronomical Society
DOI:
10.1086/590182
Bibliographic Code:
2008ApJ...682L..25C

Abstract

For the first time the cross-correlation between Type Ia supernova host galaxies and surrounding field galaxies is measured using the Supernova Legacy Survey sample. Over the z=0.2-0.9 redshift range we find that supernova hosts are correlated an average of 60% more strongly than similarly selected field galaxies over the 3"-100" range and about a factor of 3 more strongly below 10''. The correlation errors are empirically established with a jackknife analysis of the four SNLS fields. The hosts are more correlated than the field at a significance of 99% in the fitted amplitude and slope, with the point-by-point difference of the two correlation functions having a reduced χ2 for 8 degrees of freedom of 4.3, which has a probability of random occurrence of less than 3×10-5. The correlation angle is 1.5" +/- 0.5", which deprojects to a fixed comoving correlation length of approximately 6.5+/-2 h-1 Mpc. Weighting the field galaxies with the mass and star formation rate supernova frequencies of the simple A+B model produces good agreement with the observed clustering. We conclude that these supernova clustering differences are primarily the expected outcome of the dependence of supernova rates on galaxy masses and stellar populations with their clustering environment.
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