Extragalactic fast X-ray transient candidates discovered by <i>Chandra</i> (2014-2022)

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dc.contributor.authorQuirola-Vasquez, J.
dc.contributor.authorBauer, F. E.
dc.contributor.authorJonker, P. G.
dc.contributor.authorBrandt, W. N.
dc.contributor.authorYang, G.
dc.contributor.authorLevan, A. J.
dc.contributor.authorXue, Y. Q.
dc.contributor.authorEappachen, D.
dc.contributor.authorCamacho, E.
dc.contributor.authorRavasio, M. E.
dc.contributor.authorZheng, X. C.
dc.contributor.authorLuo, B.
dc.date.accessioned2025-01-20T20:07:44Z
dc.date.available2025-01-20T20:07:44Z
dc.date.issued2023
dc.description.abstractContext. Extragalactic fast X-ray transients (FXTs) are short flashes of X-ray photons of unknown origin that last a few minutes to hours.
dc.description.abstractAims. We extend the previous search for extragalactic FXTs (based on sources in the Chandra Source Catalog 2.0, CSC2) to further Chandra archival data between 2014 and 2022.
dc.description.abstractMethods. We extracted X-ray data using a method similar to that employed by CSC2 and applied identical search criteria as in previous work.
dc.description.abstractResults. We report the detection of eight FXT candidates, with peak 0.3-10 keV fluxes between 1 x 10(-13) to 1 x 10(-11) erg cm(-2) s(-1) and T-90 values from 0.3 to 12.1 ks. This sample of FXTs likely has redshifts between 0.7 and 1.8. Three FXT candidates exhibit light curves with a plateau (approximate to 1-3 ks duration) followed by a power-law decay and X-ray spectral softening, similar to what was observed for a few before-reported FXTs. In light of the new, expanded source lists (eight FXTs with known redshifts from a previous paper and this work), we have updated the event sky rates derived previously, finding 36.9(-8.3)(+9.7) deg(-2) yr(-1) for the extragalactic samples for a limiting flux of greater than or similar to 1 x 10(-13) erg cm(-2) s(-1), calculated the first FXT X-ray luminosity function, and compared the volumetric density rate between FXTs and other transient classes.
dc.description.abstractConclusions. Our latest Chandra-detected extragalactic FXT candidates boost the total Chandra sample by similar to 50%, and appear to have a similar diversity of possible progenitors.
dc.fuente.origenWOS
dc.identifier.doi10.1051/0004-6361/202345912
dc.identifier.eissn1432-0746
dc.identifier.issn0004-6361
dc.identifier.urihttps://doi.org/10.1051/0004-6361/202345912
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/91839
dc.identifier.wosidWOS:001023752300001
dc.language.isoen
dc.revistaAstronomy & astrophysics
dc.rightsacceso restringido
dc.subjectX-rays: bursts
dc.titleExtragalactic fast X-ray transient candidates discovered by <i>Chandra</i> (2014-2022)
dc.typeartículo
dc.volumen675
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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