The cosmic merger rate of neutron stars and black holes

被引:161
作者
Mapelli, Michela [1 ,2 ,3 ]
Giacobbo, Nicola [1 ,2 ,3 ,4 ]
机构
[1] Univ Innsbruck, Inst Astro & Teilchenphys, Technikerstr 25-8, A-6020 Innsbruck, Austria
[2] INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy
[3] Ist Nazl Fis Nucl, Piazza Sci 3, I-20126 Milan, Italy
[4] Univ Padua, Phys & Astron Dept Galileo Galilei, Vicolo Osservatorio 3, I-35122 Padua, Italy
基金
美国国家科学基金会;
关键词
stars: neutron; black hole physics; gravitational waves; methods: numerical; stars: mass-loss; MASSIVE STARS; COSMOLOGICAL SIMULATIONS; DIFFERENT METALLICITIES; ILLUSTRIS PROJECT; STELLAR EVOLUTION; SUPERNOVAE; DYNAMICS; BINARIES; CLUSTERS; POPULATIONS;
D O I
10.1093/mnras/sty1613
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Six gravitational wave detections have been reported so far, providing crucial insights on the merger rate of double compact objects. We investigate the cosmic merger rate of double neutron stars (DNSs), neutron star black hole binaries (NSBHs), and black hole binaries (BHBs) by means of population-synthesis simulations coupled with the Illustris cosmological simulation. We have performed six different simulations, considering different assumptions for the efficiency of common envelope (CE) ejection and exploring two distributions for the supernova (SN) kicks. The current BHB merger rate derived from our simulations spans from similar to 150 to similar to 240 Gpc(-3) yr(-1) and is only mildly dependent on CE efficiency. In contrast, the current merger rates of DNSs (ranging from similar to 20 to similar to 600 Gpc(-3) yr(-1)) and NSBHs (ranging from similar to 10 to similar to 100 Gpc(-3) yr(-1)) strongly depend on the assumptions on CE and natal kicks. The merger rate of DNSs is consistent with the one inferred from the detection of GW170817 only if a high efficiency of CE ejection and low-SN kicks (drawn from a Maxwellian distribution with one-dimensional root mean square sigma = 15 km s(-1)) are assumed.
引用
收藏
页码:4391 / 4398
页数:8
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