The distant supernova search and implications for the cosmological deceleration
| Autor: | B. J. Boyle, M. Y. Kim, Saul Perlmutter, S. Gabi, G. Goldhaber, R. Pain, Richard S. Ellis, Richard G. McMahon, Richard A. Muller, D. Carter, A. G. Kim, I. A. Small, Mike Irwin, C. R. Pennypacker, P. S. Bunclark, A. Goobar |
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| Rok vydání: | 1995 |
| Předmět: |
Physics
Absolute magnitude Nuclear and High Energy Physics Observational error Deceleration parameter Astrophysics::High Energy Astrophysical Phenomena Astronomy Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Atomic and Molecular Physics and Optics Galaxy Redshift Photometry (optics) Supernova Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Spectroscopy Astrophysics::Galaxy Astrophysics |
| Zdroj: | Nuclear Physics B - Proceedings Supplements. 43:78-81 |
| ISSN: | 0920-5632 |
| DOI: | 10.1016/0920-5632(95)00456-j |
| Popis: | We have begun a program to discover high-redshift supernovae ( z ≈ 0.2–0.6), and study them with follow-up photometry and spectroscopy. We report here our first discovery, a supernova at z = 0.458 (SN1992bi) and the ongoing analysis on several new supernova candidates found in a recent search (Dec 93 – March 94). The photometry for SN1992bi closely matches the lightcurve calculated for its redshift from the template of well-observed nearby Type la supernovae giving a best fit value for the deceleration parameter: q o = 0.1 ± 0.3 (±0.55) (with Λ = 0), where the first uncertainty is due to the photometry of the distant supernova and the second reflects the estimated intrinsic width of the Type la absolute magnitude distribution based on nearby supernovae. If there is significant host galaxy extinction then q o would be larger than this best fit value. We describe the main sources of measurement error inherent in such a measurement of qo , and ways to reduce these errors. |
| Databáze: | OpenAIRE |
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