Change search
ReferencesLink to record
Permanent link

Direct link
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
URN: urn:nbn:se:su:diva-18345DOI: doi:10.1086/589568OAI: diva2:184868
Available from: 2009-01-25 Created: 2009-01-25 Last updated: 2011-01-10Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Sollerman, Jesper
By organisation
Department of Astronomy
Astronomy, Astrophysics and Cosmology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 20 hits
ReferencesLink to record
Permanent link

Direct link