Time Dilation in Type Ia Supernova Spectra at High Redshift

Blondin, S., Davis, T. M., Krisciunas, K., Schmidt, B. P., Sollerman, J., Wood-Vasey, W. M., Becker, A. C., Challis, P., Clocchiatti, A., Damke, G., Filippenko, A. V., Foley, R. J., Garnavich, P. M., Jha, S. W., Kirshner, R. P., Leibundgut, B., Li, W., Matheson, T., Miknaitis, G., Narayan, G., Pignata, G., Rest, A., Riess, A. G., Silverman, J. M., Smith, R. C., Spyromilio, J., Stritzinger, M., Stubbs, C. W., Suntzeff, N. B., Tonry, J. L., Tucker, B. E. and Zenteno, A. (2008) Time Dilation in Type Ia Supernova Spectra at High Redshift. Astrophysical Journal, 682 2: 724-736. doi:10.1086/589568

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Author Blondin, S.
Davis, T. M.
Krisciunas, K.
Schmidt, B. P.
Sollerman, J.
Wood-Vasey, W. M.
Becker, A. C.
Challis, P.
Clocchiatti, A.
Damke, G.
Filippenko, A. V.
Foley, R. J.
Garnavich, P. M.
Jha, S. W.
Kirshner, R. P.
Leibundgut, B.
Li, W.
Matheson, T.
Miknaitis, G.
Narayan, G.
Pignata, G.
Rest, A.
Riess, A. G.
Silverman, J. M.
Smith, R. C.
Spyromilio, J.
Stritzinger, M.
Stubbs, C. W.
Suntzeff, N. B.
Tonry, J. L.
Tucker, B. E.
Zenteno, A.
Title Time Dilation in Type Ia Supernova Spectra at High Redshift
Journal name Astrophysical Journal   Check publisher's open access policy
ISSN 0004-637X
1538-4357
Publication date 2008-08-01
Year available 2008
Sub-type Article (original research)
DOI 10.1086/589568
Open Access Status File (Publisher version)
Volume 682
Issue 2
Start page 724
End page 736
Total pages 13
Place of publication Philadelphia, PA, United States
Publisher Institute of Physics Publishing
Language eng
Abstract 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 þ 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 þ z) factor.
Keyword Astronomy & Astrophysics
Astronomy & Astrophysics
ASTRONOMY & ASTROPHYSICS
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Mathematics and Physics
 
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