SUPERMASSIVE BLACK HOLES, PSEUDOBULGES, AND THE NARROW-LINE SEYFERT 1 GALAXIES
SUPERMASSIVE BLACK HOLES, PSEUDOBULGES, AND THE NARROW-LINE SEYFERT 1 GALAXIES
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DOI：
10.1088/0004-637x/754/2/146
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发表时间：
2011-02
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影响因子：
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通讯作者：
S. Mathur;D. Fields;B. Peterson;D. Grupe
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作者：
S. Mathur;D. Fields;B. Peterson;D. Grupe
我们展示了哈勃太空望远镜高级巡天相机 (ACS) 对 10 个星系的观测结果，这些星系拥有窄线 Seyfert 1 (NLS1) 核，据信这些星系包含以高爱丁顿比率吸积的质量相对较小的黑洞。我们将每个 ACS 图像去卷积为核点源 (AGN)、凸起和圆盘，并用 Sérsic 剖面拟合凸起，用指数剖面拟合圆盘。我们发现至少有五个星系可以被归类为具有假核球。所有 10 个星系都位于 MBH-Lbulge 关系下方，证实了早期的结果。它们的轨迹与假凸起所占据的轨迹相似。这使我们得出结论，NLS1 中 BH 的增长是由长期过程控制的，而不是由合并驱动的。伪核球中的活跃星系指出了黑洞与星系共同演化的另一条轨迹。由于黑洞质量-核球特性标度关系的内在分散是由星系形态、方向和红移演化等因素的组合引起的，应用标度关系来确定 BH 质量可能并不像人们希望的那么简单。
We present Hubble Space Telescope Advanced Camera for Surveys (ACS) observations of 10 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 Sérsic profile and the disk with an exponential profile. We find that at least five galaxies can be classified as having pseudobulges. All 10 galaxies lie below the MBH–Lbulge 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.