THE LARGE-SCALE ENVIRONMENTS OF TYPE Ia SUPERNOVAE: EVIDENCE FOR A METALLICITY BIAS IN THE RATE OR LUMINOSITY OF PROMPT Ia EVENTS

被引：39

作者：

Cooper, Michael C. ^{[1
]}

Newman, Jeffrey A. ^{[2
]}

Yan, Renbin ^{[3
]}

机构：

[1] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[2] Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA

[3] Univ Toronto, Dept Astron & Astrophys, Toronto, ON M5S 3H4, Canada

来源：

ASTROPHYSICAL JOURNAL | 2009年 / 704卷 / 01期

基金：

美国国家航空航天局; 美国国家科学基金会;

关键词：

galaxies: abundances; galaxies: statistics; galaxies: stellar content; large-scale structure of universe; supernovae: general; GALAXY REDSHIFT SURVEY; DIGITAL SKY SURVEY; MORPHOLOGY-DENSITY RELATION; INITIAL MASS FUNCTION; BAND OPTICAL-PROPERTIES; STAR-FORMING GALAXIES; EXTREME OUTER GALAXY; DATA RELEASE; PHYSICAL-PROPERTIES; PEAK LUMINOSITY;

D O I：

10.1088/0004-637X/704/1/687

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using data drawn from the Sloan Digital Sky Survey and the SDSS-II Supernova Survey, we study the local environments of confirmed type Ia supernovae (SNe Ia) in the nearby universe. At 0.05 < z < 0.15, we find that SN Ia events in blue, star-forming galaxies occur preferentially in regions of lower galaxy density relative to galaxies of like stellar mass and star-formation rate, while SNe Ia in nearby red galaxies show no significant environment dependence within the measurement uncertainties. Even though our samples of SNe in red hosts are relatively small in number, tests on simulated galaxy samples suggest that the observed distribution of environments for red SN Ia hosts is in poor agreement with a cluster type Ia rate strongly elevated relative to the field rate. Finally, after considering the impact of galaxy morphology, stellar age, stellar metallicity, and other relevant galaxy properties, we conclude that the observed correlation between the SN Ia rate and environment in the star-forming galaxy population is likely driven by a gas-phase metallicity effect, such that prompt type Ia supernovae occur more often or are more luminous in metal-poor systems.

引用

页码：687 / 704

页数：18

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