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	Determination of the Hubble constant, the intrinsic scatter of luminosities of Type Ia supernovae, and evidence for nonstandard dust in other galaxies
	Xiaofeng Wang ; Lifan Wang ; Pain, R. ; Xu Zhou ; Zongwei Li
	2010-05-06 ; 2010-05-06
关键词	Bibliography Experimental/ astronomical photometry cosmic dust cosmology galaxies supernovae variable stars/ Hubble constant luminosity intrinsic scatter Type Ia supernovae nonstandard dust galaxies recession velocity light curves expansion rate local universe color parameter decline rate absorption-to-reddening ratios Galaxy color index SN environmental parameters metallicity effect SN luminosity Hubble diagrams Hubble flow SNe Ia BVI bands U band Cepheid distances/ A9880L Observational cosmology A9760B Supernovae A9840B Interstellar matter A9730G delta Cep, W Vir, RV Tau, and delta Sct stars A9850E Galactic structure, content and morphology
中文摘要	A sample of 109 Type Ia supernovae (SNe Ia) with recession velocity lsim 30,000 km s/sup -1/ is compiled from published SN Ia light curves to explore the expansion rate of the local Universe. Based on the color parameter Delta C/sub 12/ and the decline rate Delta m/sub 15/, we found that the average absorption-to-reddening ratios for SN Ia host galaxies are R/sub UBVI/ = 4.37 +/- 0.25, 3.33 +/- 0.11, 2.30 +/- 0.11, and 1.18 +/- 0.11, which are systematically lower than the standard values in the Galaxy. We investigated the correlations of the intrinsic luminosity with light-curve decline rate, color index, and SN environmental parameters. In particular, we found that SNe Ia in E/S0 galaxies close to the central region are brighter than those in the outer region, which may suggest a possible metallicity effect on SN luminosity. The dependence of SN luminosity on galactic environment disappears after corrections for the extinction and Delta C/sub 12/. The Hubble diagrams constructed using 73 Hubble flow SNe Ia yield a 1 sigma scatter of lsim 0.12 mag in BVI bands and ~0.16 mag in U band. The luminosity difference between normal SNe Ia and peculiar objects (including SN 1991bg-like and SN 1991T-like events) has now been reduced to within 0.15 mag via Delta C/sub 12/ correction. We use the same precepts to correct the nearby SNe Ia with Cepheid distances and found that the fully corrected absolute magnitudes of SNe Ia are M/sub B/ = -19.33 +/- 0.06 and M/sub V/ = -19.27 +/- 0.05. We deduced a value for the Hubble constant of H/sub 0/ = 12 +/- 6 (total) km s/sup -1/ Mpc/sup -1/.
语种	英语 ; 英语
出版者	University of Chicago Press for American Astron. Soc ; USA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/14589]
专题	清华大学
推荐引用方式 GB/T 7714	Xiaofeng Wang,Lifan Wang,Pain, R.,et al. Determination of the Hubble constant, the intrinsic scatter of luminosities of Type Ia supernovae, and evidence for nonstandard dust in other galaxies[J],2010, 2010.
APA	Xiaofeng Wang,Lifan Wang,Pain, R.,Xu Zhou,&Zongwei Li.(2010).Determination of the Hubble constant, the intrinsic scatter of luminosities of Type Ia supernovae, and evidence for nonstandard dust in other galaxies..
MLA	Xiaofeng Wang,et al."Determination of the Hubble constant, the intrinsic scatter of luminosities of Type Ia supernovae, and evidence for nonstandard dust in other galaxies".(2010).

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