论文标题
用AGN辅助黑洞合并确定哈勃常数
Determining the Hubble Constant with AGN-assisted Black Hole Mergers
论文作者
论文摘要
长期以来，来自中子星星合并的重力波一直被认为是测量哈勃常数$ H_0 $的有前途的方法，它描述了宇宙的局部膨胀率。虽然黑洞合并更加丰富，但他们预期缺乏电磁发射和不良的重力波定位，使它们不适合衡量$ H_0 $。活性银河核（AGN）磁盘内的黑洞合并可能是一个例外。来自AGN磁盘的积聚可能会产生电磁信号，将观察者指向宿主星系。另外，AGN的低数量密度可以帮助确定$ 1-5 \％$合并的主机银河系。在这里，我们表明，AGN磁盘中的黑洞合并可能是确定重力波的$ H_0 $的敏感方法。如果$ 1 \％$（$ 10 \％$）的Ligo观察结果发生在具有已识别的主机星系的AGN磁盘中，则我们可以在五年内用$ 12 \％$（$ 4 \％$）的不确定性测量$ H_0 $，可能与Neuton Star合并的敏感性相当，并可以显着提高当前的Gravitation Pravitation Waver测量值。
Gravitational waves from neutron star mergers have long been considered a promising way to measure the Hubble constant, $H_0$, which describes the local expansion rate of the universe. While black hole mergers are more abundantly observed, their expected lack of electromagnetic emission and poor gravitational-wave localization make them less well suited for measuring $H_0$. Black hole mergers within the disks of Active Galactic Nuclei (AGN) could be an exception. Accretion from the AGN disk may produce an electromagnetic signal, pointing observers to the host galaxy. Alternatively, the low number density of AGNs could help identify the host galaxy of $1-5\%$ of mergers. Here we show that black hole mergers in AGN disks may be a sensitive way to determine $H_0$ with gravitational waves. If $1\%$ ($10\%$) of LIGO's observations occur in AGN disks with identified host galaxies, we could measure $H_0$ with $12\%$ ($4\%$) uncertainty in five years, possibly comparable to the sensitivity of neutron star mergers and set to considerably improve current gravitational wave measurements.
