Detection of diffuse interstellar bands in M 31

被引：38

作者：

Cordiner, M. A. ^{[1
]}

Cox, N. L. J. ^{[2
]}

Trundle, C. ^{[1
]}

Evans, C. J. ^{[3
]}

Hunter, I. ^{[1
]}

Przybilla, N. ^{[4
]}

Bresolin, F. ^{[5
]}

Salama, F. ^{[6
]}

机构：

[1] Queens Univ Belfast, Sch Math & Phys, Astrophys Res Ctr, Belfast BT7 1NN, Antrim, North Ireland

[2] ESA, Herschel Sci Ctr, European Space Astron Ctr, Madrid, Spain

[3] Royal Observ, UK ATC, Edinburgh EH9 3HJ, Midlothian, Scotland

[4] Dr Remeis Sternwarte Bamberg, D-96049 Bamberg, Germany

[5] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA

[6] NASA, Ames Res Ctr, Div Space Sci, Moffett Field, CA 94035 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2008年 / 480卷 / 01期

基金：

美国国家科学基金会;

关键词：

astrochemistry; galaxies : Local Group; galaxies : ISM; ISM : lines and bands; ISM : clouds; ISM : dust; extinction;

D O I：

10.1051/0004-6361:20079309

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims. We investigate the diffuse interstellar band (DIB) spectrum in the interstellar medium of M31. Methods. The DEIMOS spectrograph of the W. M. Keck observatory was used to make optical spectroscopic observations of two supergiant stars, MAG 63885 and MAG 70817, in the vicinity of the OB78 association in M 31 where the metallicity is approximately equal to solar. Results. The lambda lambda 5780, 5797, 6203, 6283 and 6613 DIBs are detected in both sightlines at velocities matching the M31 interstellar Na I absorption. The spectra are classified and interstellar reddenings are derived for both stars. Diffuse interstellar band ( DIB) equivalent widths and radial velocities are presented. Conclusions. The spectrum of DIBs observed in M31 towards MAG 63885 is found to be similar to that observed in the Milky Way. Towards MAG 70817 the DIB equivalent widths per unit reddening are about three times the Galactic average. Compared to observations elsewhere in the Universe, relative to reddening the M31 ISM in the vicinity of OB78 is apparently a highly favourable environment for the formation of DIB carriers.

引用

页码：L13 / L16

页数：4

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