TY - JOUR
T1 - A model for the multiwavelength radiation from tidal disruption event swift J1644+57
AU - Kumar, P.
AU - Duran, Barniol
AU - Bošnjak, Z.
AU - Piran, T.
PY - 2013/10
Y1 - 2013/10
N2 - Gamma-ray observations of a stellar tidal disruption event (TDE) detected by the Swift satellite and follow-up observations in radio, millimetre (mm), infrared and X-ray bands have provided a rich data set to study accretion on tomassive black holes, production of relativistic jets and their interaction with the surrounding medium. The radio and X-ray data for TDE Swift J1644+57 provide a conflicting picture regarding the energy in relativistic jet produced in this event: X-ray data suggest jet energy declining with time as t-5/3 whereas the nearly flat light curves in radio and mm bands lasting for about 100 d have been interpreted as evidence for the total energy output increasing with time. We show in this work that flat light curves do not require addition of energy to decelerating external shock (which produced radio and mm emission via synchrotron process), instead the flat behaviour is due to inverse-Compton cooling of electrons by X-ray photons streaming through the external shock; the higher X-ray flux at earlier times cools electrons more efficiently thereby reducing the emergent synchrotron flux, and this effect weakens as the X-ray flux declines with time.
AB - Gamma-ray observations of a stellar tidal disruption event (TDE) detected by the Swift satellite and follow-up observations in radio, millimetre (mm), infrared and X-ray bands have provided a rich data set to study accretion on tomassive black holes, production of relativistic jets and their interaction with the surrounding medium. The radio and X-ray data for TDE Swift J1644+57 provide a conflicting picture regarding the energy in relativistic jet produced in this event: X-ray data suggest jet energy declining with time as t-5/3 whereas the nearly flat light curves in radio and mm bands lasting for about 100 d have been interpreted as evidence for the total energy output increasing with time. We show in this work that flat light curves do not require addition of energy to decelerating external shock (which produced radio and mm emission via synchrotron process), instead the flat behaviour is due to inverse-Compton cooling of electrons by X-ray photons streaming through the external shock; the higher X-ray flux at earlier times cools electrons more efficiently thereby reducing the emergent synchrotron flux, and this effect weakens as the X-ray flux declines with time.
KW - Methods: analytical
KW - Radiation mechanisms: non-thermal
KW - X-rays: bursts
UR - http://www.scopus.com/inward/record.url?scp=84885098860&partnerID=8YFLogxK
U2 - 10.1093/mnras/stt1221
DO - 10.1093/mnras/stt1221
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AN - SCOPUS:84885098860
SN - 0035-8711
VL - 434
SP - 3078
EP - 3088
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -