Probing the Extinction in M31 via a Spectrum of a Quasar Seen through its Disk

被引：1

作者：

Nedialkov, P. ^{[1
]}

Williams, B. ^{[2
]}

Green, J. ^{[2
]}

Hatzidimitriou, D. ^{[3
]}

机构：

[1] St Clement Ohrid Univ Sofia, Fac Phys, Dept Astron, 5 James Bourchier Blvd, BG-1164 Sofia, Bulgaria

[2] Univ Washington, Dept Astron, Seattle, WA 98195 USA

[3] Univ Crete, Dept Phys, Iraklion GR-700, Greece

来源：

3RD SCHOOL AND WORKSHOP ON SPACE PLASMA PHYSICS | 2011年 / 1356卷

基金：

美国国家科学基金会;

关键词：

galaxies: individual: M31; quasars: individual: RX J004457+4123; DIGITAL SKY SURVEY; NOVAE; DUST; M-31;

D O I：

10.1063/1.3598091

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

We reexamined the total extinction along the sightline of a quasar (J004457+4123) behind the disk of M31 and used a varying total-to-selective extinction ratio in order to obtain a better agreement between its optical spectrum and a composite SDSS spectrum based on input spectra of quasars from DR7 at similar redshifts. The M31 outermost disk predominates (similar to 85%) the total foreground (Milky Way+M31) selective extinction EB-V = 0.30 +/- 0.05 mag and the derived gas-to-dust ratio is N(H)/EB-V = (3.5 +/- 0.7) x 10(20) at cm(-2) mag(-1).

引用

页数：5

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