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Time Dilation in Type Ia Supernova Spectra at High Redshift
Stockholm University, Faculty of Science, Department of Astronomy.
2008 (English)In: The Astrophysical Journal, Vol. 682, no 2, 724-736 p.Article in journal (Refereed) Published
Abstract [en]

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 redshift) 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.

Place, publisher, year, edition, pages
2008. Vol. 682, no 2, 724-736 p.
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-18345DOI: doi:10.1086/589568OAI: oai:DiVA.org:su-18345DiVA: diva2:184868
Available from: 2009-01-25 Created: 2009-01-25 Last updated: 2011-01-10Bibliographically approved

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