Black holes in the low-mass gap: Implications for gravitational-wave observations
Black holes in the low-mass gap: Implications for gravitational-wave observations
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DOI：
10.1103/physrevd.101.103036
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发表时间：
2019-09
影响因子：
5
通讯作者：
Anuradha Gupta;D. Gerosa;K. Arun;E. Berti;W. Farr;B. Sathyaprakash
中科院分区：
文献类型：
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作者：
Anuradha Gupta;D. Gerosa;K. Arun;E. Berti;W. Farr;B. Sathyaprakash
中子星与双星的合并将主要产生质量为103 - 4 M的黑洞残余物，从而填充中子星和恒星质量黑洞之间的假定低质量间隙。如果这些低质量黑洞处于致密的天体物理环境中，质量分离可能导致“第二代”紧凑双星在哈勃时间内合并。在本文中，我们调查可能的签名，这种低质量的紧凑的二元合并引力波观测。我们表明，这种独特的物体群，如果存在的话，将被第三代引力波探测器发现，如宇宙探测器和爱因斯坦望远镜。未来对啁啾质量M和有效自旋χ eff的联合测量可以澄清低质量间隙中致密物体的形成情况。作为一个案例研究，我们表明，最近检测到的GW 190425（沿着与GW 170817）有利于双高斯质量模型的中子星，假设在GW 190425中的主要是一个黑洞形成从以前的二元中子星合并。
Binary neutron-star mergers will predominantly produce black-hole remnants of mass ∼ 3 – 4 M ⊙ , thus populating the putative low-mass gap between neutron stars and stellar-mass black holes. If these low-mass black holes are in dense astrophysical environments, mass segregation could lead to “second-generation” compact binaries merging within a Hubble time. In this paper, we investigate possible signatures of such low-mass compact binary mergers in gravitational-wave observations. We show that this unique population of objects, if present, will be uncovered by the third-generation gravitational-wave detectors, such as Cosmic Explorer and Einstein Telescope. Future joint measurements of chirp mass M and effective spin χ eff could clarify the formation scenario of compact objects in the low-mass gap. As a case study, we show that the recent detection of GW190425 (along with GW170817) favors a double Gaussian mass model for neutron stars, under the assumption that the primary in GW190425 is a black hole formed from a previous binary neutron-star merger.