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Extragalactic Fast X-ray Transient Candidates Hidden in the Chandra Source Catalog

Presentation #404.04 in the session The Chandra Source Catalog version 2.1: New Avenues for Discovery in X-ray Datasets.

Published onJul 01, 2023
Extragalactic Fast X-ray Transient Candidates Hidden in the Chandra Source Catalog

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, ∼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 (BNS) merger. 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 22 FXRTs serendipitous discovered from the Chandra Source Catalog, the developed methodology, and the synergy with other catalogs. This new sample of 22 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 (an FXRT previously identified in the Chandra Deep Field South) and volumetric rate density, which suggests an association with GRBs. Improving 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.

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