A COMPARATIVE ANALYSIS OF VIRIAL BLACK HOLE MASS ESTIMATES OF MODERATE-LUMINOSITY ACTIVE GALACTIC NUCLEI USING SUBARU/FMOS-猫眼课题宝

DOI：

10.1088/0004-637x/771/1/64

发表时间：

2013-01

期刊：

The Astrophysical Journal

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

K. Matsuoka;J. Silverman;M. Schramm;C. Steinhardt;T. Nagao;J. Kartaltepe;D. Sanders;E. Treister;G. Hasinger;M. Akiyama;K. Ohta;Y. Ueda;A. Bongiorno;W. Brandt;M. Brusa;P. Capak;F. Civano;A. Comastri;M. Elvis;S. Lilly;V. Mainieri;D. Masters;M. Mignoli;M. Salvato;J. Trump;Y. Taniguchi;G. Zamorani;D. Alexander;K. Schawinski

我们提出了一个广泛的发射线中观察到的中等亮度的活动星系核（AGN），典型的深场X射线调查中发现的分析，与测试的有效性的单历元维里黑洞质量估计的目标。我们利用斯巴鲁望远镜上的光纤多目标光谱仪，在COSMOS和扩展的Chandra深场南巡天中获得了z ≤ 1.8的活动星系核的近红外光谱。这些近红外光谱提供了一个重要的宽Hα线的检测，被证明是一个可靠的探针黑洞质量在低红移。我们的样品有现有的光学光谱，提供了一个检测镁ii，通常用于黑洞质量估计在z = 1。我们用Hα和Mg ii进行谱线拟合，确定了宽线区气体的维里速度、3000 nm处的连续发光度和总的Hα线发光度。与样本的43 AGN跨越范围的二十年的光度，我们发现一个紧密的紫外线和发射线光度之间的相关性。Hα和Mg ii的半峰全宽之间也存在密切的一一对应关系。这两种情况都导致在黑洞质量的宽范围内，基于Hα和Mg ii的质量之间存在非常好的一致性，即，MBH 107-9 M。一般来说，这些结果表明，局域标度关系，使用Mg ii或Hα，适用于活动星系核在中等亮度和高达z <$2。

We present an analysis of broad emission lines observed in moderate-luminosity active galactic nuclei (AGNs), typical of those found in X-ray surveys of deep fields, with the goal of testing the validity of single-epoch virial black hole mass estimates. We have acquired near-infrared spectra of AGNs up to z ∼ 1.8 in the COSMOS and Extended Chandra Deep Field-South Survey, with the Fiber Multi-Object Spectrograph mounted on the Subaru telescope. These near-infrared spectra provide a significant detection of the broad Hα line, shown to be a reliable probe of black hole mass at low redshift. Our sample has existing optical spectroscopy that provides a detection of Mg ii, typically used for black hole mass estimation at z ≳ 1. We carry out a spectral-line fitting procedure using both Hα and Mg ii to determine the virial velocity of gas in the broad-line region, the continuum luminosity at 3000 Å, and the total Hα line luminosity. With a sample of 43 AGNs spanning a range of two decades in luminosity, we find a tight correlation between the ultraviolet and emission-line luminosity. There is also a close one-to-one relationship between the full width at half-maximum of Hα and Mg ii. Both of these then lead to there being very good agreement between Hα- and Mg ii-based masses over a wide range in black hole mass, i.e., MBH ∼ 107–9 M☉. In general, these results demonstrate that local scaling relations, using Mg ii or Hα, are applicable for AGNs at moderate luminosities and up to z ∼ 2.

A COMPARATIVE ANALYSIS OF VIRIAL BLACK HOLE MASS ESTIMATES OF MODERATE-LUMINOSITY ACTIVE GALACTIC NUCLEI USING SUBARU/FMOS

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