Cosmological time dilation using type Ia supernovae as clocks
| Autor: | Michael A. Dopita, H. Newberg, A. V. Filippenko, S. Perlmutter, P. S. Bunclark, C. Pennypacker, I. Small, Mike Irwin, I. Hook, Thomas Matheson, G. Goldhaber, Ariel Goobar, R. McMahon, D. Carter, Warrick J. Couch, S. Deustua, Julia C. Lee, D. Groom, Richard S. Ellis, A. Kim, S. Gabi, Karl Glazebrook, R. Pain, B. J. Boyle |
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| Rok vydání: | 1996 |
| Předmět: |
Physics
Nuclear and High Energy Physics Astrophysics::High Energy Astrophysical Phenomena Astronomy Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Type (model theory) Light curve Atomic and Molecular Physics and Optics Redshift Spectral line Galaxy Metric expansion of space Supernova Astrophysics::Solar and Stellar Astrophysics Time dilation Astrophysics::Galaxy Astrophysics |
| Zdroj: | Nuclear Physics B - Proceedings Supplements. 51:123-127 |
| ISSN: | 0920-5632 |
| Popis: | Alhough there is little doubt at present that the redshift of distant galaxies is due to an expansion of the universe, we present in this paper a direct confirmation for the cosmological expansion. This work is based on the first results from a systematic search for high redshift Type Ia supernovae. We discovered over twenty seven SNe, before or at maximum light. In this paper we report on the first seven of these, with redshift z = 0.35 – 0.46. Type Ia SNe are known to be a homogeneous group of SNe, to first order, with very similar light curves, spectra and peak luminosities. In this paper we report that the light curves we observe are all broadened (time dilated) as expected from the expanding universe hypothesis. Small variations from the expected 1 + z broadening of the light curve widths can be attributed to a width-brightness correlation that has been observed for nearby SNe ( z |
| Databáze: | OpenAIRE |
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