Host galaxy-active galactic nucleus alignments in the Sloan Digital Sky Survey Data Release 7
文献类型：期刊论文
| 作者 | Lagos, Claudia del P.1,2; Padilla, Nelson D.2,3; Strauss, Michael A.4; Cora, Sofia A.5,6,7; Hao, Lei8,9
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2011-07-01 |
| 卷号 | 414期号:3页码:2148-2162 |
| 关键词 | galaxies: active galaxies: evolution |
| 英文摘要 | We determine the intrinsic shapes and orientations of 27450 types I and II active galactic nucleus (AGN) galaxies in the spectroscopic sample of the Sloan Digital Sky Survey Data Release 7 by studying the distribution of projected axial ratios of AGN hosts. Our aim is to study possible alignments between the AGN and host galaxy systems (e. g. the accretion disc and the galaxy angular momentum) and the effect of dust obscuration geometry on the AGN type. We define control samples of non-AGN galaxies that mimic the morphology, colour, luminosity and concentration distributions of the AGN population, taking into account the effects of dust extinction and reddening. Assuming that AGN galaxies have the same underlying 3D shape distribution as their corresponding control samples, we find that the spiral and elliptical type I AGN populations are strongly skewed towards face-on galaxies, while elliptical and spiral type II AGN populations are skewed towards edge-on orientations. These findings rule out random orientations for AGN hosts at high confidence for type I spirals (delta chi(2) approximate to 230) and type II ellipticals (delta chi(2) approximate to 15), while the signal for type I ellipticals and type II spirals is weaker (delta chi(2) approximate to 3 and approximate to 6, respectively). We obtain a much stronger tendency for the type II spirals to be edge-on when just high [OIII] equivalent width (EW) AGN are considered, suggesting that > 20 per cent of low [OIII] EW edge-on type II AGN may be missing from the optical sample. Galactic dust absorption of the broad-line region alone cannot explain the observed inclination angle and projected axial ratio distributions of types I and II Seyfert galaxies, implying that obscuration by a small-scale circumnuclear torus is necessary. These results favour a scenario in which the angular momentum of the material which feeds the black hole retains a memory of its original gas source at least to some small, non-negligible degree. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | SUPERMASSIVE BLACK-HOLES ; REDSHIFT RADIO GALAXIES ; X-RAY ; SEYFERT-GALAXIES ; LUMINOSITY FUNCTION ; NEARBY GALAXIES ; SAURON PROJECT ; EMISSION-LINE ; INFRARED LUMINOSITY ; ELLIPTIC GALAXIES |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000292977600026 |
| 源URL | [http://119.78.226.72/handle/331011/26392]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Univ Durham, Dept Phys, Inst Computat Cosmol, Durham DH1 3LE, England 2.Pontificia Univ Catolica Chile, Dept Astron & Astrofis, Santiago, Chile 3.Pontificia Univ Catolica Chile, Ctr Astroingn, Santiago, Chile 4.Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA 5.Univ Nacl La Plata, Fac Ciencias Astron & Geofis, RA-1900 La Plata, Buenos Aires, Argentina 6.Consejo Nacl Invest Cient & Tecn, Inst Astrofis La Plata, CCT La Plata, UNLP,Observ Astron, RA-1900 La Plata, Buenos Aires, Argentina 7.Consejo Nacl Invest Cient & Tecn, RA-1917 Buenos Aires, DF, Argentina 8.Univ Texas Austin, McDonald Observ, Austin, TX 78712 USA 9.Shanghai Astron Observ, Shanghai 200030, Peoples R China |
| 推荐引用方式 GB/T 7714 | Lagos, Claudia del P.,Padilla, Nelson D.,Strauss, Michael A.,et al. Host galaxy-active galactic nucleus alignments in the Sloan Digital Sky Survey Data Release 7[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2011,414(3):2148-2162. |
| APA | Lagos, Claudia del P.,Padilla, Nelson D.,Strauss, Michael A.,Cora, Sofia A.,&Hao, Lei.(2011).Host galaxy-active galactic nucleus alignments in the Sloan Digital Sky Survey Data Release 7.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,414(3),2148-2162. |
| MLA | Lagos, Claudia del P.,et al."Host galaxy-active galactic nucleus alignments in the Sloan Digital Sky Survey Data Release 7".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 414.3(2011):2148-2162. |
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来源：上海天文台
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