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

Citation:

Nedialkov P, Williams B, Green J, Hatzidimitriou D. Probing the Extinction in M31 via a Spectrum of a Quasar Seen through its Disk. In: Vol. 1356. ; 2011. pp. 45 - 49.

Date Presented:

2011/07/1

Abstract:

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 (~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)×1020 atcm-2 mag-1.

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