Jul 5 – 10, 2021
Europe/Rome timezone

Extragalactic Fast X-ray Transient Candidates Discovered by Chandra

Jul 5, 2021, 7:00 PM
Talk in the parallel session GRB 170817A and Binary Models GRB 170817A and Binary Models


Mr Jonathan Quirola Vasquez (Pontificia Universidad Católica de Chile)


Fast X-ray Transients (FXRTs) are as-yet unexplained phenomena. They are energetic X-ray flares that last a few tens to a few thousand seconds. Over the past few years, $\sim$30 extragalactic FXRTs have been discovered in Chandra, XMM-Newton, Swift/XRT and eROSITA data. Numerous proposed explanations include a tidal disruption (TDE) of a white dwarf (WD) by an intermediate-mass black hole (IMBH), a supernova shock breakout (SBO), and a binary neutron star merger (BNS). So far, FXRTs lack multiwavelength counterparts, and hence we rely on their host properties to understand their nature. In this talk, I will present a new population of FXRTs serendipitous discovered from Chandra archival data (observation from the Chandra Data Release 2). This new sample of 14 FXRTs might have a mix of origins. We identify a sub-sample of FXRTs that show similar timing and spectral properties to CDF-S XT2 (a FXRT previously identified in the Chandra Deep Field South), and volumetric rate density, which suggest an association with BNSs. The improve in the detection of FXRTs by the current and future X-ray missions will open new opportunities to study and understand exotic astrophysics phenomena associated with FXRTs.

Primary authors

Mr Jonathan Quirola Vasquez (Pontificia Universidad Católica de Chile) Prof. Franz Bauer (Pontificia Universidad Católica de Chile) Prof. Peter Jonker (Radboud University) Mr Deepak Eappachen (Radboud University)

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