DUST IN ACTIVE GALACTIC NUCLEI: ANOMALOUS SILICATE TO OPTICAL EXTINCTION RATIOS?
文献类型：期刊论文
| 作者 | Lyu, Jianwei1,2; Hao, Lei1 ; Li, Aigen2
|
| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
 |
| 出版日期 | 2014-09-01 |
| 卷号 | 792期号:1页码:9-13 |
| 关键词 | dust galaxies: active galaxies: ISM infrared: galaxies extinction |
| 通讯作者 | 郝蕾 |
| 英文摘要 | Dust plays a central role in the unification theory of active galactic nuclei (AGNs). However, little is known about the nature (e.g., size, composition) of the dust that forms a torus around the AGN. In this Letter, we report a systematic exploration of the optical extinction (A(V)) and the silicate absorption optical depth (Delta tau(9.7)) of 110 type 2 AGNs. We derive A(V) from the Balmer decrement based on the Sloan Digital Sky Survey data, and Delta tau(9.7) from the Spitzer/InfraRed Spectrograph data. We find that with a mean ratio of < A(V)/Delta tau(9.7)> less than or similar to 5.5, the optical-to-silicate extinction ratios of these AGNs are substantially lower than that of the Galactic diffuse interstellar medium (ISM) for which A(V)/Delta tau(9.7) approximate to 18.5. We argue that the anomalously low A(V)/Delta tau(9.7) ratio could be due to the predominance of larger grains in the AGN torus compared to that in the Galactic diffuse ISM. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | DIGITAL SKY SURVEY ; STAR-FORMING GALAXIES ; MU-M ; INTERSTELLAR EXTINCTION ; RED QUASARS ; X-RAY ; EMISSION ; AGN ; ABSORPTION ; GRAINS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000341306900009 |
| 公开日期 | 2015-02-14 |
| 源URL | [http://119.78.226.72//handle/331011/15746]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Univ Missouri, Dept Phys & Astron, Columbia, MO 65211 USA |
| 推荐引用方式 GB/T 7714 | Lyu, Jianwei,Hao, Lei,Li, Aigen. DUST IN ACTIVE GALACTIC NUCLEI: ANOMALOUS SILICATE TO OPTICAL EXTINCTION RATIOS?[J]. ASTROPHYSICAL JOURNAL LETTERS,2014,792(1):9-13. |
| APA | Lyu, Jianwei,Hao, Lei,&Li, Aigen.(2014).DUST IN ACTIVE GALACTIC NUCLEI: ANOMALOUS SILICATE TO OPTICAL EXTINCTION RATIOS?.ASTROPHYSICAL JOURNAL LETTERS,792(1),9-13. |
| MLA | Lyu, Jianwei,et al."DUST IN ACTIVE GALACTIC NUCLEI: ANOMALOUS SILICATE TO OPTICAL EXTINCTION RATIOS?".ASTROPHYSICAL JOURNAL LETTERS 792.1(2014):9-13. |
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来源：上海天文台
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