Time dilation in type Ia supernova spectra at high redshift

Blondin S.; Davis, TM; Krisciunas K.; Schmidt, BP; Sollerman, J; Wood-Vasey, WM; Becker, AC; Challis, P; Clocchiatti, A.; Damke G.; Filippenko, AV; Foley, RJ; Garnavich, PM; Jha, SW; Kirshner, RP; et. al.

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 + 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. © 2008. The American Astronomical Society. All rights reserved.

Más información

Título según WOS: Time dilation in type Ia supernova spectra at high redshift
Título según SCOPUS: Time dilation in type Ia supernova spectra at high redshift
Título de la Revista: ASTROPHYSICAL JOURNAL
Volumen: 682
Número: 2
Editorial: UNIV CHICAGO PRESS
Fecha de publicación: 2008
Página de inicio: 724
Página final: 736
Idioma: English
URL: http://stacks.iop.org/0004-637X/682/i=2/a=724
DOI:

10.1086/589568

Notas: ISI, SCOPUS