Belczynski 2007 Constrain the NS-NS merger model

主要内容:
Using their startrack code, the result is: if the mass of NS is greater 2.5 M_sun, can't produce short GRB.

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文章信息:

arXiv:0712.1036 [ps, pdf, other]

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

Authors: K. Belczynski, R. O'Shaughnessy, V. Kalogera, F. Rasio, R. Taam, T. Bulik

Comments: 4 pages, submitted to Science

Subjects: Astrophysics (astro-ph)

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 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 a majority of short gamma-ray bursts originate in double neutron star mergers. Specifically, we find that the maximum neutron star mass must be within 2--2.5 Msun. Moreover, a single unambiguous measurement of a neutron star mass above 2.5 Msun would exclude double neutron star mergers as short gamma-ray burst progenitors.