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首页> 外文期刊>The Astrophysical journal >DETERMINING CENTRAL BLACK HOLE MASSES IN DISTANT ACTIVE GALAXIES
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DETERMINING CENTRAL BLACK HOLE MASSES IN DISTANT ACTIVE GALAXIES

机译：确定远距离活动星系中的中央黑洞质量

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摘要

An empirical relationship, of particular interest for studies of high-redshift active galactic nuclei (AGNs) and quasars, between the masses of their central black holes and rest-frame ultraviolet (UV) parameters measured in single-epoch AGN spectra is presented. This relationship is calibrated to recently measured reverberation masses of low-redshift AGNs and quasars. An empirical relationship between single-epoch rest-frame optical spectrophotometric measurements and the central masses is also presented. The UV relationship allows reasonable estimates of the central masses to be made for high-redshift AGNs and quasars for which these masses cannot be directly or easily measured by the techniques applicable to the lower luminosity, nearby AGNs. The central mass obtained by this method can be estimated to within a factor of ～3 for most objects. This is reasonable given the intrinsic uncertainty of a factor of less than 2 in the primary methods used to measure the central masses of nearby inactive and active galaxies, namely, resolved gas and stellar kinematics in the underlying host galaxy and reverberation-mapping techniques. The UV relationship holds good potential for being a powerful tool for studying black hole demographics at high redshift as well as statistically studying the fundamental properties of AGNs. The broad-line region size-luminosity relationship is key to the calibrations presented here. The fact that its intrinsic scatter is also the main source of uncertainty in the calibrations stresses the need for better observational constraints to be placed on this relationship. The empirically calibrated relationships presented here will be applied to quasar samples in forthcoming work.
机译：提出了一种经验关系，特别是对于研究高红移活动银河核（AGN）和类星体之间的经验关系，它们之间的中心黑洞质量与单历元AGN光谱中测得的静止帧紫外线（UV）参数之间。这种关系已针对最近测得的低红移AGN和类星体的混响质量进行了校准。还提出了单周期静止帧光学分光光度法测量值与中心质量之间的经验关系。紫外线关系允许对高红移AGN和类星体进行中心质量的合理估计，而这些质量不能通过适用于较低光度的邻近AGN的技术直接或轻易地测量。对于大多数物体，通过这种方法获得的中心质量可以估计在约3倍的范围内。考虑到用于测量附近非活跃和活跃星系中心质量的主要方法（即底层宿主星系中的分辨气体和恒星运动学和混响映射技术）的固有不确定性小于2，这是合理的。紫外线关系具有成为研究高红移黑洞人口统计以及统计研究AGN基本性质的有力工具的良好潜力。粗线区域大小与亮度的关系是此处介绍的校准的关键。它的固有散射也是校准不确定性的主要来源，这一事实强调了对这种关系需要更好的观测约束的需求。此处介绍的经验校准关系将应用于即将开展的工作中的类星体样本。

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  • 来源
    《The Astrophysical journal》 |2002年第1期|p.733-752|共20页
  • 作者

    M. VESTERGAARD;

  • 作者单位

    Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210-1173;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 天文学;
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