Measuring the Hubble Constant with GW190521 as an Eccentric black hole Merger and Its Potential Electromagnetic Counterpart
Measuring the Hubble Constant with GW190521 as an Eccentric black hole Merger and Its Potential Electromagnetic Counterpart
复制标题
DOI：
10.3847/2041-8213/abe388
复制
发表时间：
2021-02
期刊：
影响因子：
--
通讯作者：
V. Gayathri;J. Healy;J. Lange;B. O'Brien;M. Szczepańczyk;I. Bartos;M. Campanelli;S. Klimenko;C. Lousto;R. O’Shaughnessy
中科院分区：
文献类型：
--
作者：
V. Gayathri;J. Healy;J. Lange;B. O'Brien;M. Szczepańczyk;I. Bartos;M. Campanelli;S. Klimenko;C. Lousto;R. O’Shaughnessy
引力波观测可用于精确测量哈勃常数\(H_0\)，并有助于理解Ia型超新星和宇宙微波背景所给出的限制之间目前存在的差异。中子星并合主要用于这一目的，因为它们的电磁辐射可用于大幅降低测量的不确定性。在此，我们利用最近观测到的黑洞并合事件GW190521以及兹威基瞬变设施（ZTF）发现的其可能的电磁对应体，通过对GW190521特性的高度偏心解释来量化所隐含的\(H_0\)。由于电磁关联目前不确定，我们在此的主要目标是确定偏心率对估计的\(H_0\)的影响。我们得到（具体数值）\(km s^{-1} Mpc^{-1}\)。我们的结果表明，未来利用黑洞并合进行的\(H_0\)计算将需要考虑可能存在的偏心率。在极端情况下，活动星系核盘中双星的轨道速度可能会带来显著的系统不确定性。
Gravitational-wave observations can be used to accurately measure the Hubble constant H0 and could help understand the present discrepancy between constraints from Type Ia supernovae and the cosmic microwave background. Neutron star mergers are primarily used for this purpose as their electromagnetic emission can be used to greatly reduce measurement uncertainties. Here we quantify the implied H0 using the recently observed black hole merger GW190521 and its candidate electromagnetic counterpart found by ZTF using a highly eccentric explanation of the properties of GW190521. As the electromagnetic association is currently uncertain, our main goal here is to determine the effect of eccentricity on the estimated H0. We obtain km s−1 Mpc−1. Our results indicate that future H0 computations using black hole mergers will need to account for possible eccentricity. For extreme cases, the orbital velocity of binaries in active galactic nucleus disks can represent a significant systematic uncertainty.