Repeated Imaging of Massive Black Hole Binary Orbits with Millimeter Interferometry: Measuring Black Hole Masses and the Hubble Constant
Repeated Imaging of Massive Black Hole Binary Orbits with Millimeter Interferometry: Measuring Black Hole Masses and the Hubble Constant
复制标题
用毫米干涉测量对大质量黑洞双轨进行重复成像：测量黑洞质量和哈勃常数
作者：
D. D’Orazio;A. Loeb
毫米波长的甚长基线干涉测量(VLBI)被用来以几十微角秒的角度分辨率来解析银河系黑洞周围环境的事件视界尺度结构。同样的方法也可以解决大量黑洞双星(MBHBs)的轨道分离问题。对引力波发射和气体引起的双星的激发进行模拟，并需要小于10年的双星轨道周期，我们估计可能存在∼100可分辨的MBHBs，其亮度足以被毫米波VLBI仪在红移z≲0.5时观测到。我们建议通过从光学和近红外测量中发现的周期性类星体光曲线中识别出具有所需轨道间隔的双星来寻找这些可分辨的MBHBs。这些周期光曲线候选者可以通过射电观测来确定它们在毫米波长使用VLBI进行观测的前景。VLBI在双星轨道的时间尺度上的观测可以使双星质量的测量达到前所未有的精度，达到30%以内。与独立的双星质量测量相结合，VLBI观测将允许一种新的哈勃常数测量，独立于目前提出和使用的那些。
Very long baseline interferometry (VLBI) at millimeter (mm) wavelengths is being employed to resolve event horizon-scale structure of the environment surrounding the Milky Way black hole at an angular resolution of a few tens of microarcseconds. The same approach could also resolve the orbital separation of a population of massive black hole binaries (MBHBs). Modeling the inspiral of binaries due to gravitational-wave emission and gas and requiring binary orbital periods of less than 10 yr, we estimate that there may exist ∼100 resolvable MBHBs that are bright enough to be observed by mm-wavelength VLBI instruments over the entire sky at redshifts z ≲ 0.5. We propose to search for these resolvable MBHBs by identifying binaries with the required orbital separations from periodic quasar light curves identified in optical and near-IR surveys. These periodic-light-curve candidates can be followed up with radio observations to determine their promise for observation with VLBI at mm wavelengths. The VLBI observations over the timescale of a binary orbit can allow unprecedented precision in the measurement of the binary mass, to within 30%. In combination with an independent binary mass measurement, VLBI observation would allow a novel measurement of the Hubble constant, independent from those currently proposed and employed.
影响因子：
4.8
作者：
Coughlin, Eric R.;Armitage, Philip J.;Begelman, Mitchell C.
通讯作者：
Begelman, Mitchell C.
DOI：
10.3847/1538-4357/aaad0f
发表时间：
2017-03
期刊：
The Astrophysical Journal
影响因子：
--
作者：
A. Sesana;Z. Haiman;B. Kocsis;L. Kelley
通讯作者：
A. Sesana;Z. Haiman;B. Kocsis;L. Kelley
影响因子：
4.8
作者：
Yi-Lei Tang;A. MacFadyen;Z. Haiman
通讯作者：
Yi-Lei Tang;A. MacFadyen;Z. Haiman