Nonlinear decline-rate dependence and intrinsic variation of type Ia supernova luminosities

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 毫米波和亚毫米波技术实验室

	Nonlinear decline-rate dependence and intrinsic variation of type Ia supernova luminosities
	Wang, LF; Strovink, M ; Conley, A ; Goldhaber, G ; Kowalski, M ; Perlmutter, S ; Siegrist, J
刊名	ASTROPHYSICAL JOURNAL
	2006-04-10
卷号	641 期号:1 页码:50-69
关键词	cosmology : observations distance scale supernovae : general
ISSN号	0004-637X
英文摘要	Published B and V fluxes from nearby Type Ia supernovae (SNe) are fitted to light-curve templates with four to six adjustable parameters. Separately, B magnitudes from the same sample are fitted to a linear dependence on B-V color within a postmaximum time window prescribed by the CMAGIC method. These fits yield two independent SN magnitude estimates B-max and B-BV. Their difference varies systematically with decline-rate Delta m(15) in a form that is compatible with a bilinear but not a linear dependence; a nonlinear form likely describes the decline-rate dependence of Bmax itself. A Hubble fit to the average of Bmax and BBV requires a systematic correction for observed B-V color that can be described by a linear coefficient R 2:59 +/- 0:24, well below the coefficient R-B approximate to 4:1 commonly used to characterize the effects of Milky Way dust. At 99.9% confidence the data reject a simple model in which no color correction is required for SNe that are clustered at the blue end of their observed color distribution. After systematic corrections are performed, Bmax and BBV exhibit mutual rms intrinsic variation equal to 0:074 +/- 0:019 mag, of which at least an equal share likely belongs to BBV. SN magnitudes measured using maximum luminosity or CMAGIC methods show comparable rms deviations of order approximate to 0.14 mag from the Hubble line. The same fit also establishes a 95% confidence upper limit of 486 km s(-1) on the rms peculiar velocity of nearby SNe relative to the Hubble flow.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	HIGH-REDSHIFT SUPERNOVAE ; LIGHT-CURVE SHAPES ; INFRARED PHOTOMETRY ; HUBBLE CONSTANT ; HOST GALAXY ; CEPHEID CALIBRATION ; PRECISE DISTANCE ; EXTINCTION ; PARAMETER ; UNIVERSE
收录类别	SCI
语种	英语
WOS记录号	WOS:000236817800004
公开日期	2012-02-07
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/3550]
专题	紫金山天文台_毫米波和亚毫米波技术实验室
作者单位	1.EO Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA 2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 3.Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
推荐引用方式 GB/T 7714	Wang, LF,Strovink, M,Conley, A,et al. Nonlinear decline-rate dependence and intrinsic variation of type Ia supernova luminosities[J]. ASTROPHYSICAL JOURNAL,2006,641(1):50-69.
APA	Wang, LF.,Strovink, M.,Conley, A.,Goldhaber, G.,Kowalski, M.,...&Siegrist, J.(2006).Nonlinear decline-rate dependence and intrinsic variation of type Ia supernova luminosities.ASTROPHYSICAL JOURNAL,641(1),50-69.
MLA	Wang, LF,et al."Nonlinear decline-rate dependence and intrinsic variation of type Ia supernova luminosities".ASTROPHYSICAL JOURNAL 641.1(2006):50-69.