The relations among 8, 24 and 160 μm dust emission within nearby spiral galaxies

被引：102

作者：

Bendo, G. J. ^{[1
]}

Draine, B. T. ^{[2
]}

Engelbracht, C. W. ^{[3
]}

Helou, G.

Thornley, M. D. ^{[5
]}

Bot, C. ^{[4
]}

Buckalew, B. A. ^{[6
]}

Calzetti, D. ^{[7
]}

Dale, D. A. ^{[8
]}

Hollenbach, J. ^{[9
]}

Li, A. ^{[10
]}

Moustakas, J. ^{[11
]}

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Astrophys Grp, London SW7 2AZ, England

[2] Princeton Univ Observ, Princeton, NJ 08544 USA

[3] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[4] CALTECH, Spitzer Sci Ctr, Pasadena, CA 91101 USA

[5] Bucknell Univ, Dept Phys & Astron, Lewisburg, PA 17837 USA

[6] Embry Riddle Aeronaut Univ, Dept Phys, Prescott, AZ 86301 USA

[7] Univ Massachusetts, Dept Astron, Amherst, MA 01002 USA

[8] Univ Wyoming, Dept Phys & Astron, Laramie, WY 82071 USA

[9] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA

[10] Univ Missouri, Dept Phys & Astron, Columbia, MO 65211 USA

[11] NYU, Dept Phys, New York, NY 10003 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2008年 / 389卷 / 02期

关键词：

galaxies : ISM; infrared : galaxies;

D O I：

10.1111/j.1365-2966.2008.13567.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate the relations among the stellar continuum-subtracted 8 mu m polycyclic aromatic hydrocarbon (PAH 8 mu m) emission, 24 mu m hot dust emission and 160 mu m cold dust emission in 15 nearby face-on spiral galaxies in the Spitzer Infrared Nearby Galaxies Survey sample. The relation between PAH 8 and 24 mu m emission measured in similar to 2 kpc regions is found to exhibit a significant amount of scatter, and strong spatial variations are observed in the (PAH 8 mu m)/24 mu m surface brightness ratio. In particular, the (PAH 8 mu m)/24 mu m surface brightness ratio is observed to be high in the diffuse interstellar medium and low in bright star-forming regions and other locations with high 24 mu m surface brightness. PAH 8 mu m emission is found to be well-correlated with 160 mu m emission on spatial scales of similar to 2 kpc, and the (PAH 8 mu m)/160 mu m surface brightness ratio is generally observed to increase as the 160 mu m surface brightness increases. These results suggest that the PAHs are associated with the diffuse, cold dust that produces most of the 160 mu m emission in these galaxies, and the variations in the (PAH 8 mu m)/160 mu m ratio may generally be indicative of either the intensity or the spectrum of the interstellar radiation field that is heating both the PAHs and the diffuse interstellar dust.

引用

页码：629 / 650

页数：22

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