Average Spectral Properties of Type Ia Supernova Host Galaxies

doi:10.3847/1538-4357/aa93e9

	Average Spectral Properties of Type Ia Supernova Host Galaxies
	Uddin, Syed A.1,2; Mould, Jeremy 2,3; Wang, Lifan1,4
刊名	ASTROPHYSICAL JOURNAL
	2017-12-01
卷号	850 期号:2 页码:6
关键词	galaxies: general supernovae: general techniques: spectroscopic
ISSN号	0004-637X
DOI	10.3847/1538-4357/aa93e9
通讯作者	Uddin, Syed A.(saushuvo@gmail.com)
英文摘要	We construct the average spectra of host galaxies of slower, faster, bluer, and redder Type Ia supernovae (SNe Ia) from the SDSS-II supernova survey. The average spectrum of slower declining (broader light curve width or higher stretch) SN Ia hosts shows stronger emission lines compared to the average spectrum of faster declining (narrower light curve width or lower stretch) SN Ia hosts. Using pPXF, we find that hosts of slower declining SNe Ia have metallicities that are, on average, 0.24 dex lower than average metallicities of faster declining SN Ia hosts. Similarly, redder SN Ia hosts have slightly higher metallicities than bluer SN Ia hosts. Lick index analysis of metallic lines and Balmer lines shows that faster declining SN Ia hosts have relatively higher metal content and have relatively older stellar populations compared with slower declining SN Ia hosts. We calculate average Ha star formation rate (SFR), stellar mass, and the specific SFR (sSFR) of host galaxies in these subgroups of SNe Ia. We find that slower declining SN Ia hosts have significantly higher (> 5 sigma) sSFR than faster declining SN Ia hosts. A Kolmogorov-Smirnov test shows that these two types of hosts originate from different parent distributions. Our results, when compared with the models of Childress et al., indicate that slower declining SNe Ia, being hosted in actively star-forming galaxies, are young (prompt) SNe Ia, originating from similar progenitor age groups.
WOS关键词	COSMOLOGICAL PARAMETERS ; ACCELERATING UNIVERSE ; DARK ENERGY ; AGES
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000425471400004
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/22322]
专题	中国科学院紫金山天文台
通讯作者	Uddin, Syed A.
作者单位	1.Chinese Acad Sci, Purple Mt Observ, Nanjing, Jiangsu, Peoples R China 2.ARC, Ctr Excellence All Sky Astrophys CAASTRO, Canberra, ACT, Australia 3.Swinburne Univ Technol, Ctr Astrophys & Supercomp, Melbourne, Vic, Australia 4.Texas A&M Univ, Dept Phys & Astron, College Stn, TX USA
推荐引用方式 GB/T 7714	Uddin, Syed A.,Mould, Jeremy,Wang, Lifan. Average Spectral Properties of Type Ia Supernova Host Galaxies[J]. ASTROPHYSICAL JOURNAL,2017,850(2):6.
APA	Uddin, Syed A.,Mould, Jeremy,&Wang, Lifan.(2017).Average Spectral Properties of Type Ia Supernova Host Galaxies.ASTROPHYSICAL JOURNAL,850(2),6.
MLA	Uddin, Syed A.,et al."Average Spectral Properties of Type Ia Supernova Host Galaxies".ASTROPHYSICAL JOURNAL 850.2(2017):6.