Powerful Ejection of Matter from Tidally Disrupted Stars near Massive Black Holes and a Possible Application to Sagittarius A East

Details Powerful Ejection of Matter from Tidally Disrupted Stars near Massive Black Holes and a Possible Application to Sagittarius A East Powerful Ejection of Matter from Tidally Disrupted Stars near Massive Black Holes and a Possible Application to Sagittarius A East

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...457l..61k&link_type=abstract

Astrophysical Journal Letters v.457, p.L61

Physics

50

Black Hole Physics, Galaxy: Center, Galaxies: Nuclei, Ism: General, Nebulae: Supernova Remnants

Scientific paper

When a star is tidally disrupted by a massive black hole, approximately half of its mass is ejected within a solid angle Omega >~ 16(R*/Rp)1/2(M*/Mh)1/2 radians2, where R*, Rp, M*, and Mh are the stellar radius, pericentric distance of the orbit, stellar mass and the black hole mass, respectively. The energy of the ejecta is E ~ 3.8 x 1054(M*/M&sun;)2(R&sun;/R*)(Mh/106M&sun;)(R*/Rp)2 ergs. The impact of the disrupted matter efflux on the surrounding gas may be like that of a supernova, although with considerably greater energy and with an anisotropy in the ensuing shell structure compared to that of a "standard" supernova event. For the conditions in the Galactic center, these events should occur roughly once every 104--105 yr. Sgr A East, one of the components in the Sgr A complex enshrouding the Galactic nucleus, may be the remnant of a solar mass star disrupted by a 106 M&sun; black hole at a pericentric distance Rp ~ 10 R&sun;, which results in an explosion with energy ~4 x 1052 ergs.

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