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).
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页数：5
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