The lowest-mass stellar black holes: Catastrophic death of neutron stars in gamma-ray bursts

被引:43
作者
Belczynski, K.
O'Shaughnessy, R. [1 ]
Kalogera, V. [2 ]
Rasio, F. [2 ]
Taam, R. E. [2 ]
Bulik, T. [3 ]
机构
[1] Penn State Univ, University Pk, PA 16802 USA
[2] Northwestern Univ, Evanston, IL 60208 USA
[3] Warsaw Univ, Warsaw, Poland
关键词
binaries : close; black hole physics; gravitational waves; stars : evolution; stars : neutron;
D O I
10.1086/589970
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Mergers of double neutron stars are considered the most likely progenitors for short gamma-ray bursts. Indeed, such a merger can produce a black hole with a transient accreting torus of nuclear matter, and the conversion of a fraction of the torus mass-energy to radiation can power a gamma-ray burst. Using available binary pulsar observations supported by our extensive evolutionary calculations of double neutron star formation, we demonstrate that the fraction of mergers that can form a black hole-torus system depends very sensitively on the (largely unknown) maximum neutron star mass. We show that the available observations and models put a very stringent constraint on this maximum mass under the assumption that black hole formation is required to produce a short gamma-ray burst in a double neutron star merger. Specifically, we find that the maximum neutron star mass must be within. Moreover, a single unambiguous measurement of a neutron star mass above 2 - 2.5 M-circle dot, would exclude a black hole - torus central engine model of short gamma-ray bursts in double neutron 2.5 M-circle dot, star mergers. Such an observation would also indicate that if in fact short gamma-ray bursts are connected to neutron star mergers, the gamma-ray burst engine is best explained by the lesser known model invoking a highly magnetized massive neutron star.
引用
收藏
页码:L129 / L132
页数:4
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