Astronomy and Astrophysics – Astronomy
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...190.5303d&link_type=abstract
American Astronomical Society, 190th AAS Meeting, #53.03; Bulletin of the American Astronomical Society, Vol. 29, p.848
Astronomy and Astrophysics
Astronomy
2
Scientific paper
Recently, we have shown that the conditions favorable for short-lived neutron star (NS) binary formation (as well as for NS--black hole binaries) followed by the merging of binary components and then gamma-ray burst production originate at the advanced stages of evolution of dense galactic nuclei (Ozernoy et al. 1997; Dokuchaev et al. 1997). Here we show that, in the process of a central massive black hole (MBH) formation in an evolved galactic nucleus, the nucleus becomes a source of multiple, or fast recurrent GRBs. As a result of radiative (via gravitational radiation) captures of NSs from the halo, a temporally existing, very dense cusp of NSs forms near the growing central MBH. These captures of NSs into the cusp take place until the MBH reaches the mass M_h= Mmax ~10(4) (v/10(3) km s(-1) right )(-2) M_&sun;, where v is velocity dispersion in the central star cluster. At M_h>Mmax, the radiative captures of NSs into the cusp become inefficient. Mutual collisions of NSs in the cusp occur mainly through radiative captures of two NSs into a binary that rapidly evolves and ends up in the merging of the components thereby producing GRBs. Unless the four GRBs on October 27-29, 1996 detected by BATSE from a particular direction on the sky are simply one long event, several options might interpret them in the framework of recurrence: (i) a very dense, nearly collapsing core consisting of NSs and BHs with a total mass M_c =~ 10(3-10^4) M_&sun; and velocity dispersion v =~ 10(4) km s(-1) ; (ii) a cusp of NSs around a newborn MBH of mass M_h =~ 5*10(2) -10(3) M_&sun;; (iii) two successive coalescence in a triple NS system (if the October '96 GRBs are just two long events). Feasibility of those options is discussed.
Dokuchaev, V.I., Eroshenko, Yu. N., & Ozernoy, L.M., 1997, ApJ (in press)
Ozernoy, L.M., Dokuchaev, V.I., & Eroshenko, Yu. N. 1996, BAAS 28, 1309
Dokuchaev Viacheslav I.
Eroshenko Yu. N.
Ozernoy Leonid
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