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Heartbeat Oscillation detected in IGR J17091-3624

ATel #8948; Mark Reynolds (UMichigan), Jon Miller (UMichigan), Askley King (Stanford) on behalf of a larger collaboration
on 14 Apr 2016; 00:47 UT
Credential Certification: Mark Reynolds (markrey@umich.edu)

Subjects: Radio, Infra-Red, X-ray, Black Hole, Transient

We report on the results of ongoing monitoring observation of the Galactic micro-quasar IGR J17091-3624 with Swift/XRT in windowed timing mode.

In an ~860s observation on 2016-04-13T13:05:46 UT (obsid: 00031921133), clear oscillations are detected consistent with the re-emergence of the so-called heartbeat oscillation (ATel #3230, #3418) in the accretion flow of this micro-quasar with a frequency of approximately 0.027 Hz.

The source spectrum is well characterized by model consisting of the emission from an accretion disk and a hot optically thin Comptonizing corona, e.g., kT_disk ~ 0.9 keV, kT0_corona ~ 0.6 keV, tau_corona ~ 0.6, kT_e == 100 keV (chi^2/dof = 496/462), with a flux of f_x ~ 1.4e-09 erg/s/cm^2 corresponding to a luminosity of ~ 1e37 (d/8kpc)^2 erg/s in the 0.3-10.0 keV band.

Follow-up observations at all wavelengths are encouraged.

IGR J17091-3624 X-ray lightcurve