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

Abstract

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) 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.

11 pages, to appear in ApJ

References in corpus (8)

• The Internal-Collision-Induced Magnetic Reconnection and Turbulence (ICMART) Model of Gamma-Ray Bursts
• Mass Fall-back and Accretion in the Central Engine of Gamma-Ray Bursts
• A New Paradigm for Gamma Ray Bursts: Long Term Accretion Rate Modulation by an External Accretion Disk
• GRB060218 as a Tidal Disruption of a White Dwarf by an Intermediate Mass Black Hole
• The photospheric radiation model for the prompt emission of Gamma-ray Bursts: Interpreting four observed correlations
• Delayed X-ray emission from fallback in compact-object mergers
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Cited by in corpus (4)

• Evolution of Accretion Disks in Tidal Disruption Events
• Quasi-Periodic Variations in X-ray Emission and Long-Term Radio Observations: Evidence for a Two-Component Jet in Sw J1644+57
• The Definitive X-ray Light Curve of Swift J164449.3+573451
• Long-term X-ray emission from Swift J1644+57