Time dilation in type Ia supernova spectra at high redshift

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DOI

  • S. Blondin, Harvard-Smithsonian Center for Astrophysics
  • ,
  • T. M. Davis, Niels Bohr Institute, The University of Queensland
  • ,
  • K. Krisciunas, Texas A and M University
  • ,
  • B. P. Schmidt, Research School of Astronomy and Astrophysics, The Australian National University, Canberra, ACT, Australia, RSSS, Australian National University
  • ,
  • J. Sollerman, Niels Bohr Institute
  • ,
  • W. M. Wood-Vasey, Harvard-Smithsonian Center for Astrophysics
  • ,
  • A. C. Becker
  • P. Challis, Harvard-Smithsonian Center for Astrophysics
  • ,
  • A. Clocchiatti, Pontificia Universidad Catolica de Chile
  • ,
  • G. Damke, Cerro Tololo Inter-American Observatory
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  • A. V. Filippenko, UC Berkeley
  • ,
  • R. J. Foley, UC Berkeley
  • ,
  • P. M. Garnavich, University of Notre Dame
  • ,
  • S. W. Jha, Rutgers, the State University of New Jersey
  • ,
  • R. P. Kirshner, Harvard-Smithsonian Center for Astrophysics
  • ,
  • B. Leibundgut, European Southern Observatory
  • ,
  • W. Li
  • T. Matheson, National Optical Astronomy Observatory
  • ,
  • G. Miknaitis, Center for Particle Astrophysics, Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510, USA
  • ,
  • G. Narayan, Harvard University
  • ,
  • G. Pignata, Universidad Austral de Chile
  • ,
  • A. Rest, Cerro Tololo Inter-American Observatory, Harvard University
  • ,
  • A. G. Riess, Johns Hopkins University Hospital, STScI
  • ,
  • J. M. Silverman, UC Berkeley
  • ,
  • R. C. Smith
  • J. Spyromilio, European Southern Observatory
  • ,
  • M. Stritzinger
  • C. W. Stubbs, Harvard-Smithsonian Center for Astrophysics, Harvard University
  • ,
  • N. B. Suntzeff, Texas A and M University
  • ,
  • J. L. Tonry, University of Hawaii Manoa
  • ,
  • B. E. Tucker, RSSS, Australian National University
  • ,
  • A. Zenteno, University of Illinois at Urbana-Champaign
  • Department of Physics and Astronomy

We present multiepoch spectra of 13 high-redshift Type Ia supernovae (SNe Ia) drawn from the literature, the ESSENCE and SNLS projects, and our own separate dedicated program on the ESO Very Large Telescope. We use the Supernova Identification (SNID) code of Blondin and Tonry to determine the spectral ages in the supernova rest frame. Comparison with the observed elapsed time yields an apparent aging rate consistent with the 1 /(1 + z) factor (where z is the redshifi) expected in a homogeneous, isotropic, expanding universe. These measurements thus confirm the expansion hypothesis, while unambiguously excluding models that predict no time dilation, such as Zwicky's "tired light" hypothesis. We also test for power-law dependencies of the aging rate on redshift. The best-fit exponent for these models is consistent with the expected 1/(1 + z) factor.

Original languageEnglish
JournalAstrophysical Journal
Volume682
Issue2
Pages (from-to)724-736
Number of pages13
ISSN0004-637X
DOIs
Publication statusPublished - 1 Aug 2008

    Research areas

  • Cosmology: miscellaneous, Supernovae: general

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