ACCRETION RATE AND THE PHYSICAL NATURE OF UNOBSCURED ACTIVE GALAXIES
ACCRETION RATE AND THE PHYSICAL NATURE OF UNOBSCURED ACTIVE GALAXIES
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DOI：
10.1088/0004-637x/733/1/60
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发表时间：
2011-03
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通讯作者：
J. Trump;C. Impey;Brandon C. Kelly;F. Civano;J. Gabor;A. Diamond-Stanic;A. Merloni;C. Urry;H. Hao;K. Jahnke;T. Nagao;Y. Taniguchi;A. Koekemoer;G. Lanzuisi;Charles T. Liu;V. Mainieri;M. Salvato;N. Scoville
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作者：
J. Trump;C. Impey;Brandon C. Kelly;F. Civano;J. Gabor;A. Diamond-Stanic;A. Merloni;C. Urry;H. Hao;K. Jahnke;T. Nagao;Y. Taniguchi;A. Koekemoer;G. Lanzuisi;Charles T. Liu;V. Mainieri;M. Salvato;N. Scoville
我们展示了吸积率如何支配一个清晰的宽线，窄线和无线活动星系核（AGN）的样本的物理性质。我们避免了系统的错误，通过使用准确的内禀吸积光度（Lint）从采样良好的多波长光谱能量分布的宇宙演化调查，和准确的黑洞质量来自维里标度关系（宽线活动星系）或主机活动星系核的关系（窄线和无线活动星系核）的AGN吸积率的先前的研究。一般来说，宽发射线只在最高吸积率（Lint/LEdd > 10−2）时才出现，这些快速吸积的活动星系核被观测为宽线活动星系核，或者可能是被遮蔽的窄线活动星系核。比吸积率较低的窄线和无线活动星系核（Lint/LEdd 10 - 2宽线活动星系核，因为RIAF的非束缚性质意味着更容易形成射电外流。当Lint/LEdd < 10−2时，红外环的特征也会变得更弱或消失，尽管可能有额外的中红外同步辐射与RIAF有关。总之，这些结果表明，比吸积率是一个重要的物理“轴”的活动星系核统一，描述了一个简单的模型。
We show how accretion rate governs the physical properties of a sample of unobscured broad-line, narrow-line, and lineless active galactic nuclei (AGNs). We avoid the systematic errors plaguing previous studies of AGN accretion rates by using accurate intrinsic accretion luminosities (Lint) from well-sampled multiwavelength spectral energy distributions from the Cosmic Evolution Survey, and accurate black hole masses derived from virial scaling relations (for broad-line AGNs) or host–AGN relations (for narrow-line and lineless AGNs). In general, broad emission lines are present only at the highest accretion rates (Lint/LEdd > 10−2), and these rapidly accreting AGNs are observed as broad-line AGNs or possibly as obscured narrow-line AGNs. Narrow-line and lineless AGNs at lower specific accretion rates (Lint/LEdd 10−2 broad-line AGNs, since the unbound nature of the RIAF means it is easier to form a radio outflow. The IR torus signature also tends to become weaker or disappear from Lint/LEdd < 10−2 AGNs, although there may be additional mid-IR synchrotron emission associated with the RIAF. Together, these results suggest that specific accretion rate is an important physical “axis” of AGN unification, as described by a simple model.