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arXiv 0705.1546astro-ph
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外流和类星体的物理性质

Outflows and the Physical Properties of Quasars

Rajib Ganguly, Michael S. Brotherton, Sabrina Cales, Brian Scoggins, Zhaohui Shang, Marianne Vestergaard

摘要:

我们研究了斯隆数字巡天第二次数据发布的5088个类星体样本,以确定宽吸收线(BALs)的频率和性质如何依赖于黑洞质量,辐射光度,爱丁顿分数(L/L_Edd)和光谱斜率。我们只专注于高电离BALs,并找到了一些显着的结果。虽然类星体在爱丁顿极限附近的吸积比低$L/L_{Edd}$系统更有可能显示BALs,但BALs存在于只有百分之几的爱丁顿吸积的类星体中。我们发现一个更强的影响与热光度,这样最明亮的类星体更有可能显示BALs。还有一个先前已知的额外效应,即BAL类星体平均比未被吸收的类星体更红。最强的影响,涉及类星体的物理性质和BAL属性有关的终端流出速度。观测到的最大外流速度随着辐射热光度和光谱斜率的蓝度而增加,这表明紫外线光度在很大程度上决定了加速。这些结果支持通过紫外线散射的外流加速的想法。

英文摘要:

We have investigated a sample of 5088 quasars from the Sloan Digital Sky Survey Second Data Release in order to determine how the frequency and properties of broad absorptions lines (BALs) depend on black hole mass, bolometric luminosity, Eddington fraction (L/L_Edd), and spectral slope. We focus only on high-ionization BALs and find a number of significant results. While quasars accreting near the Eddington limit are more likely to show BALs than lower $L/L_{Edd}$ systems, BALs are present in quasars accreting at only a few percent Eddington. We find a stronger effect with bolometric luminosity, such that the most luminous quasars are more likely to show BALs. There is an additional effect, previously known, that BAL quasars are redder on average than unabsorbed quasars. The strongest effects involving the quasar physical properties and BAL properties are related to terminal outflow velocity. Maximum observed outflow velocities increase with both the bolometric luminosity and the blueness of the spectral slope, suggesting that the ultraviolet luminosity to a great extent determines the acceleration. These results support the idea of outflow acceleration via ultraviolet line scattering.

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