1208.5319 (Wei-Hong Gao)

SWIFT J164449.3+573451: a plunging event with the Poynting-flux dominated outflow    [PDF]

Wei-Hong Gao

Swift J164449+573451 is a peculiar outburst which is most likely powered by the tidal disruption of a star by a massive black hole. Within the tidal disruption scenario, we show that the periastron distance is considerably smaller than the disruption radius and the outflow should be launched mainly via magnetic activities (e.g., Blandford-Znajek process or Blandford-Payne process) otherwise the observed long-lasting X-ray afterglow emission satisfying the relation $L_{X}\propto\dot{M}$ can not be reproduced, where $L_{X}$ is the X-ray luminosity and $\dot{M}$ is the accretion rate. We also suggest that $L_{X}\propto\dot{M}$ may hold in the quick decline phase of Gamma-ray Bursts.

View original: http://arxiv.org/abs/1208.5319