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arXiv 1102.0537astro-ph.CO
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超大质量黑洞、伪膨胀和窄线塞弗特1星系

Supermassive black holes, pseudobulges, and the narrow-line Seyfert 1 galaxies

Smita Mathur, Dale Fields, Bradley M. Peterson, Dirk Grupe

摘要:

我们提出了HST/ACS观测的10个星系的主机窄线塞弗特1(NLS 1)的核,认为包含相对较小的质量黑洞吸积在高爱丁顿比。我们将每个ACS图像反卷积为核点源(AGN),凸起和磁盘,并将凸起与Sersic配置文件和磁盘与指数配置文件相匹配。我们发现,至少有五个星系可以被归类为具有pseudobulges。所有十个星系都低于\mbh -L $_{bulge}$关系,证实了早期的结果。它们的轨迹与伪隆起所占据的轨迹相似。这使我们得出结论,在NLS 1 s的BH的增长是由长期的过程,而不是合并驱动。活动星系在赝核球中的演化指向了黑洞的另一种演化轨迹--星系共同演化。由于内在的散射在黑洞质量-膨胀属性标度关系的组合因素,如星系的形态,方向,和红移的演变,应用标度关系来确定BH质量可能不会像希望的那样简单。

英文摘要:

We present HST/ACS observations of ten galaxies that host narrow-line Seyfert 1 (NLS1) nuclei, believed to contain relatively smaller mass black holes accreting at high Eddington ratios. We deconvolve each ACS image into a nuclear point source (AGN), a bulge, and a disk, and fitted the bulge with a Sersic profile and the disk with an exponential profile. We find that at least five galaxies can be classified as having pseudobulges. All ten galaxies lie below the \mbh--L$_{bulge}$ relation, confirming earlier results. Their locus is similar to that occupied by pseudobulges. This leads us to conclude that the growth of BHs in NLS1s is governed by secular processes rather than merger-driven. Active galaxies in pseudobulges point to an alternative track of black hole--galaxy co-evolution. Because of the intrinsic scatter in black hole mass--bulge properties scaling relations caused by a combination of factors such as the galaxy morphology, orientation, and redshift evolution, application of scaling relations to determine BH masses may not be as straightforward as has been hoped.

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