The origin of the gamma-ray burst of GRB 060614

摘要

The evidences of GRB060614 shows that it cannot be simply modeled by either of the popular mechanisms for theconventional gamma-ray bursts,either a colapsar origin for a long GRB or a merging origin for a short GRB．A new progenitormodel is required for this special gamma-ray burst．We propose here that the tidal disruption of a star by an intermediate massblack hole(IMBH)could be an ideal way to power the gamma-ray burst of GRB 060614．Our motivation is that the debris ofthe tidally disrupted star is likely to form all accretion disk surrounding the black hole．When the debris disk accretes at theEddington-rate,the thermal instability in the inner region of the disk results in the seed magnetic field to be amplified,creatingall ordered strong poloidal fields threading the black hole．A powerful jet extracted energy via BZ-process will be launched,giving birth to a burst．This is similar to the jets triggered by collapsars and binary mergers．The results show that the debrisaccreted onto the IMBH is a conceivable energy source for GRBs．