The detection of silicate emission from quasars at 10 and 18 microns

被引：148

作者：

Hao, L

Spoon, HWW

Sloan, GC

Marshall, JA

Armus, L

Tielens, AGGM

Sargent, B

van Bemmel, IM

Charmandaris, V

Weedman, DW

Houck, JR

机构：

[1] Cornell Univ, Dept Astron, Ithaca, NY 14853 USA

[2] CALTECH, Spitzer Sci Ctr, Pasadena, CA 91125 USA

[3] Univ Groningen, Natl Inst Space Res, SRON, NL-9700 AV Groningen, Netherlands

[4] Univ Groningen, Kepteyn Astron Inst, NL-9700 AV Groningen, Netherlands

[5] Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA

[6] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[7] Univ Crete, Dept Phys, GR-71003 Iraklion, Greece

[8] Observ Paris, F-75014 Paris, France

来源：

ASTROPHYSICAL JOURNAL | 2005年 / 625卷 / 02期

基金：

美国国家航空航天局;

关键词：

galaxies : active; galaxies : ISM; infrared : galaxies; quasars : emission lines;

D O I：

10.1086/431227

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the spectroscopic detection of silicate emission at 10 and 18 mm in five PG quasars, the first detection of these two features in galaxies outside the Local Group. This finding is consistent with the unification model for active galactic nuclei (AGNs), which predicts that an AGN torus seen pole-on should show a silicate emission feature in the mid-infrared. The strengths of the detected silicate emission features range from 0.12 to 1.25 times the continuum at 10 mu m and from 0.20 to 0.79 times the continuum at 18 mu m. The silicate grain temperatures inferred from the ratio of 18 mu m to 10 mm silicate features under the assumption of optically thin emission range from 140 to 220 K.

引用

页码：L75 / L78

页数：4

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