![]() ![]() ![]() Stellar envelope along the direction of the rotation axis.Ī related massive core collapse mechanism has been considered by Relativistic jet, which breaks through the infalling core and the This accretion onto the black hole feeds a (For initial stellar masses in excessĬore is expected to collapse to a BH, e.g.Ĭollapsing core mass is below the Chandrasekhar mass and is expected to The relatively long duration of the gamma-rayĪscribed to a correspondingly long duration for the accretion of the debrisįalling into the central black hole which must form as theĬore of a massive star collapses. Support for a massive stellar collapse origin of long GRBs, as argued by Weeks after the burst in few cases, has provided strong Galaxies, as well as the identification of a SN Ib/c light curve peaking The preponderance of short-lived massive star formation in such young Long GRB may, in principle, be detectable up to z 25-30 Indicating that ~ 40% of long GRB may be at z 4. This has implications for the expected redshift distribution of GRB Lower than that of the average massive star forming galaxies Indicated also that the long GRB host galaxy metallicity is generally This was also the case for the thirty-some cases measured by Beppo-SAX (e.g. Identified this was of an early type, usually a blue star-forming galaxy Swift up to the end of 2005, in all cases where a host galaxy was Out of the ~ 90 long bursts ( t 2 s) detected by ![]()
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