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Colloquium

Giant X-ray Flares in Nearby Galaxies

2017-03-08
  • Speaker : Prof. Jimmy Irwin (University of Alabama)
  • Date : 2017-05-24 16:00 ~ 17:00
  • Place : J331-2
  • Host : Dr. Chunglee Kim

 Very rapid (<1 minute), high amplitude (>100) variability at >1e40 erg/s is nearly unprecedented in our Universe. We have recently discovered a new class of X-ray point sources showing such variability in two nearby galaxies while analyzing archival Chandra and XMM-Newton data. One source is located within a suspected globular cluster of the host galaxy and flared one time, while the other source is located in either a globular cluster of the host galaxy or the core of a stripped dwarf companion galaxy that flared on five occasions over a seven year time span. When not flaring, the sources appear as normal accreting neutron star or black hole X-ray binaries, indicating that the flare event does not significantly disrupt the system. We speculate on the nature of these explosive, yet non-destructive objects.