Luminosity indicators in the ultraviolet spectra of type Ia supernovae

被引：51

作者：

Foley, Ryan J. ^{[1
]}

Filippenko, Alexei V. ^{[1
]}

Jha, Saurabh W. ^{[2
]}

机构：

[1] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA

[2] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA

来源：

ASTROPHYSICAL JOURNAL | 2008年 / 686卷 / 01期

关键词：

cosmology : observations; distance scale; supernovae : general; supernovae : individual;

D O I：

10.1086/590467

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a complete sample of International Ultraviolet Explorer and Hubble Space Telescope ultraviolet (UV) spectra of Type Ia supernovae (SNe Ia) through 2004. We measure the equivalent width (EW) and blueshifted velocity of the minimum of the one strong UV feature, Fe II lambda 3250. We also quantify the slope of the near-UV spectra using a new parameter, the "UV ratio.'' We find that the velocity of the Fe II line does not correlate with light-curve shape, while the EW shows distinct behavior for the slow- and fast-declining objects. Using precise Cepheid and surface brightness fluctuation distance measurements of six objects with UV spectra observed near maximum light ( a total of 12 spectra), we determine that the UV ratio at maximum light is highly correlated with SN Ia luminosity. A larger sample of UV spectra is necessary to determine the validity of these luminosity indicators and whether they can be combined with light-curve shape to improve measured SN Ia distances.

引用

页码：117 / 126

页数：10

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