The Peak Luminosity of Type Ia Supernovae and its Implications for the Cosmic Expansion Rate

The Peak Luminosity of Type Ia Supernovae and its

Implications for the Cosmic Expansion Rate

佚名

【期刊名称】《天文和天体物理学研究》 【年(卷),期】2001(001)003

【摘要】Supernovae of type Ia (SNe Ia) are confirmed to be the best distance indicators to derive the cosmic expansion rate. The dispersion of their peak lumi nosity at optical bands (BVI) is approximate to 0.13 mag, after taking into account the effects of the second parameters (i,e., the initial decline rate △m15(B) and (B - V) color at maximum light). The local calibrations from HST indicate an absolute magnitude of 19.48 ± 0.08 mag (in V band) for SNe Ia in spiral galaxies. The current expansion rate, H0, is found to be 63.6 ± 1.8 (random) ±5.7 (system-atic) kms-1 Mpc-1. This value will decrease by 3% when the metallicity effect on the cepheid distances is considered. In addition, a marginal local outward flow of 4.0 ± 4.5% within the velocity-distance of 7 000 km s-1 can be inferred from SNe Ia for the Einstein-de Sitter universe; however, this outward flow is only 2.2 ± 4.4% for an accelerating expansion universe (which is supported by high-z SNe Ia). 【总页数】14页(257-270)

【关键词】Cosmology: observations - distance scale - supernovae: general

【作者】佚名

【作者单位】Department of Astronomy, Beijing Normal University, Beijing 100875;Department of Astronomy, Beijing Normal University, Beijing 100875;Department of Astronomy, Beijing Normal University, Beijing 100875 【正文语种】中文 【中图分类】P14 【文献来源】

https://www.zhangqiaokeyan.com/academic-journal-cn_research-astronomy-astrophysics_thesis/0201254261257.html 【相关文献】

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