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arXiv 1506.04800astro-ph.GA
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AGN宽线区域与热辐射亮度成比例

AGN Broad Line Regions Scale with Bolometric Luminosity

Sascha Trippe

摘要:

活动星系核(AGN)中超大质量黑洞的质量可以通过光谱学方法通过基于选定的宽光学/紫外发射线的维里质量估计来导出。这些估计通常使用线宽作为气体速度的代理和单色连续发光度作为宽线区域的半径的代理。然而,如果宽谱线区域的大小与活动星系核的辐射热光度而不是单色光度成比例,那么基于不同发射谱线的质量估计将显示出系统性的差异,这是活动星系核连续体颜色的函数。这实际上已经在基于H-α/H-β和C IV线的质量估计中观察到,表明AGN宽线区域确实与热光度成比例。鉴于这种影响似乎被忽视了,目前使用的单历元质量估计可能会有偏差。

英文摘要:

The masses of supermassive black holes in active galactic nuclei (AGN) can be derived spectroscopically via virial mass estimators based on selected broad optical/ultraviolet emission lines. These estimates commonly use the line width as a proxy for the gas speed and the monochromatic continuum luminosity as a proxy for the radius of the broad line region. However, if the size of the broad line region scales with bolometric rather than monochromatic AGN luminosity, mass estimates based on different emission lines will show a systematic discrepancy which is a function of the color of the AGN continuum. This has actually been observed in mass estimates based on H-alpha / H-beta and C IV lines, indicating that AGN broad line regions indeed scale with bolometric luminosity. Given that this effect seems to have been overlooked as yet, currently used single-epoch mass estimates are likely to be biased.

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