The host galaxies of active galactic nuclei

被引:3191
作者
Kauffmann, G [1 ]
Heckman, TM
Tremonti, C
Brinchmann, J
Charlot, S
White, SDM
Ridgway, SE
Brinkmann, J
Fukugita, M
Hall, PB
Ivezic, Z
Richards, GT
Schneider, DP
机构
[1] Max Planck Inst Astrophys, D-85748 Garching, Germany
[2] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
[3] CNRS, Inst Astrophys, F-75014 Paris, France
[4] Apache Point Observ, Sunspot, NM 88349 USA
[5] Univ Tokyo, Inst Cosm Ray Res, Chiba 2778582, Japan
[6] Pontificia Univ Catolica Chile, Fac Fis, Dept Astron & Astrofis, Santiago 22, Chile
[7] Princeton Univ Observ, Princeton, NJ 08544 USA
[8] Penn State Univ, Dept Astron & Astrophys, Davey Lab 525, University Pk, PA 16802 USA
关键词
galaxies : active; galaxies : Seyfert; galaxies : starburst; galaxies : stellar content; galaxies : structure;
D O I
10.1111/j.1365-2966.2003.07154.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We examine the properties of the host galaxies of 22 623 narrow-line active galactic nuclei (AGN) with 0.02 < z < 0.3 selected from a complete sample of 122 808 galaxies from the Sloan Digital Sky Survey. We focus on the luminosity of the [O III]lambda5007 emission line as a tracer of the strength of activity in the nucleus. We study how AGN host properties compare with those of normal galaxies and how they depend on L[O III]. We find that AGN of all luminosities reside almost exclusively in massive galaxies and have distributions of sizes, stellar surface mass densities and concentrations that are similar to those of ordinary early-type galaxies in our sample. The host galaxies of low-luminosity AGN have stellar populations similar to normal early types. The hosts of high-luminosity AGN have much younger mean stellar ages. The young stars are not preferentially located near the nucleus of the galaxy, but are spread out over scales of at least several kiloparsecs. A significant fraction of high-luminosity AGN have strong Hdelta absorption-line equivalent widths, indicating that they experienced a burst of star formation in the recent past. We have also examined the stellar populations of the host galaxies of a sample of broad-line AGN. We conclude that there is no significant difference in stellar content between type 2 Seyfert hosts and quasars (QSOs) with the same [O III] luminosity and redshift. This establishes that a young stellar population is a general property of AGN with high [O III] luminosities.
引用
收藏
页码:1055 / 1077
页数:23
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