The host galaxies of active galactic nuclei
The host galaxies of active galactic nuclei
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DOI：
10.1111/j.1365-2966.2003.07154.x
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发表时间：
2003-12
影响因子：
4.8
通讯作者：
G. Kauffmann;T. Heckman;C. Tremonti;J. Brinchmann;S. Charlot;S. White;S. Ridgway;J. Brinkmann
中科院分区：
文献类型：
--
作者：
G. Kauffmann;T. Heckman;C. Tremonti;J. Brinchmann;S. Charlot;S. White;S. Ridgway;J. Brinkmann
我们检查了从斯隆数字巡天 122 808 个星系的完整样本中选出的 22 623 个 0.02 < z < 0.3 的窄线活动星系核 (AGN) 的宿主星系的属性。我们关注 [O III] λ5007 发射线的光度作为原子核活动强度的示踪剂。我们研究 AGN 宿主特性与正常星系的比较，以及它们如何依赖于 L[O III]。我们发现所有光度的活动星系核几乎都存在于大质量星系中，并且其大小、恒星表面质量密度和浓度的分布与我们样本中的普通早期型星系相似。低光度活动星系核的宿主星系具有与正常早期类型相似的恒星群。高光度活动星系核的宿主的平均恒星年龄要年轻得多。年轻的恒星并不优先位于星系核附近，而是分布在至少几千秒差距的尺度上。很大一部分高光度 AGN 具有很强的 Hδ 吸收线等效宽度，这表明它们在最近经历了恒星形成的爆发。我们还检查了宽线活动星系核样本的宿主星系的恒星群。我们的结论是，具有相同 [O III] 光度和红移的 2 型 Seyfert 宿主和类星体 (QSO) 之间的恒星含量没有显着差异。这表明年轻的恒星群是具有高 [O III] 光度的活动星系核的一般属性。
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] λ5007 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 Hδ 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.