论文标题
在存在辐射反馈的情况下，合并星系中巨大黑洞的配对概率
The Pairing Probability of Massive Black Holes in Merger Galaxies in the Presence of Radiative Feedback
论文作者
论文摘要
针对恒星和气体的动力摩擦（DF）被认为是合并残留星系中巨大黑洞（MBH）轨道演化的重要机制。但是，最近的理论研究表明，DF并不总是会导致MBH Inspral。对于在气体丰富的背景下演变的MBH，从积聚流的最内部出现的电离辐射会以这种方式影响周围气体，从而导致MBHS加速并获得轨道能量。这种效果被称为“负DF”。我们使用半分析模型来研究负DF对MBH对在恒星和气态DF的综合影响下进化的合并残留星系对MBH的影响。我们的结果表明，对于广泛的合并星系和MBH属性，负DF将MBH配对概率降低$ \ sim 46 \％$。在具有其中一个或多个特性的星系中，对MBH配对的抑制最为严重：（1）$ f_g \ geq 0.1 $的气体分数； （2）旋转接近圆速度的银河气盘； （3）MBH成对在Prograde，低偏心轨道和（4）MBH对，质量$ <10^8 \，$ M $ _ \ odot $。最后一点是重要的，因为该质量范围内的MBH对是合并未来空间基于空间的引力波观测LISA的直接祖细胞。
Dynamical friction (DF) against stars and gas is thought to be an important mechanism for orbital evolution of massive black holes (MBHs) in merger remnant galaxies. Recent theoretical investigations however show that DF does not always lead to MBH inspiral. For MBHs evolving in gas-rich backgrounds, the ionizing radiation that emerges from the innermost parts of their accretion flow can affect the surrounding gas in such a way to cause the MBHs to accelerate and gain orbital energy. This effect was dubbed "negative DF". We use a semi-analytic model to study the impact of negative DF on pairs of MBHs in merger remnant galaxies evolving under the combined influence of stellar and gaseous DF. Our results show that for a wide range of merger galaxy and MBH properties negative DF reduces the MBH pairing probability by $\sim 46\%$. The suppression of MBH pairing is most severe in galaxies with one or more of these properties: (1) a gas fraction of $f_g \geq 0.1$; (2) a galactic gas disk rotating close to the circular velocity; (3) MBH pairs in prograde, low eccentricity orbits, and (4) MBH pairs with mass $< 10^8\,$M$_\odot$. The last point is of importance because MBH pairs in this mass range are direct progenitors of merging binaries targeted by the future space-based gravitational wave observatory LISA.
