XMM-<i>Newton</i>-discovered Fast X-ray Transients: host galaxies and limits on contemporaneous detections of optical counterparts

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dc.contributor.authorEappachen, D.
dc.contributor.authorJonker, P. G.
dc.contributor.authorQuirola-Vasquez, J.
dc.contributor.authorMata Sanchez, D.
dc.contributor.authorInkenhaag, A.
dc.contributor.authorLevan, A. J.
dc.contributor.authorFraser, M.
dc.contributor.authorTorres, M. A. P.
dc.contributor.authorBauer, F. E.
dc.contributor.authorChrimes, A. A.
dc.contributor.authorStern, D.
dc.contributor.authorGraham, M. J.
dc.contributor.authorSmartt, S. J.
dc.contributor.authorSmith, K. W.
dc.contributor.authorRavasio, M. E.
dc.contributor.authorZabludoff, A. I.
dc.contributor.authorYue, M.
dc.contributor.authorStoppa, F.
dc.contributor.authorMalesani, D. B.
dc.contributor.authorStone, N. C.
dc.contributor.authorWen, S.
dc.date.accessioned2025-01-20T16:10:01Z
dc.date.available2025-01-20T16:10:01Z
dc.date.issued2024
dc.description.abstractExtragalactic fast X-ray transients (FXTs) are a class of soft (0.3-10 keV) X-ray transients lasting a few hundred seconds to several hours. Several progenitor mechanisms have been suggested to produce FXTs, including supernova shock breakouts, binary neutron star mergers, or tidal disruptions involving an intermediate-mass black hole and a white dwarf. We present detailed host studies, including spectroscopic observations of the host galaxies of seven XMM-Newton-discovered FXTs. The candidate hosts lie at redshifts 0.0928 <z < 0.645 implying peak X-ray luminosities of 10(43) erg s(-1) <L X < 10(45) erg s(-1) and physical offsets of 1 kpc < r(proj) < 22 kpc. These observations increase the number of FXTs with a spectroscopic redshift measurement by a factor of 2, although we note that one event is re-identified as a Galactic flare star. We infer host star formation rates and stellar masses by fitting the combined spectroscopic and archival photometric data. We also report on a contemporaneous optical counterpart search to the FXTs in Pan-STARRS and ATLAS by performing forced photometry at the position of the FXTs. We do not find any counterpart in our search. Given our constraints, including peak X-ray luminosities, optical limits, and host properties, we find that XRT 110 621 is consistent with an supernova shock breakout (SN SBO) event. Spectroscopic redshifts of likely host galaxies for four events imply peak X-ray luminosities that are too high to be consistent with SN SBOs, but we are unable to discard either the binary neutron star or white dwarf-intermediate-mass black hole tidal disruption event scenarios for these FXTs.
dc.fuente.origenWOS
dc.identifier.doi10.1093/mnras/stad3924
dc.identifier.eissn1365-2966
dc.identifier.issn0035-8711
dc.identifier.urihttps://doi.org/10.1093/mnras/stad3924
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/90190
dc.identifier.wosidWOS:001186620300012
dc.issue.numero4
dc.language.isoen
dc.pagina.final11839
dc.pagina.inicio11823
dc.revistaMonthly notices of the royal astronomical society
dc.rightsacceso restringido
dc.subjectgamma-ray burst: general
dc.subjectX-rays: bursts
dc.subjectX-rays: general
dc.subjectsupernovae: general
dc.subjectgalaxies: general
dc.titleXMM-<i>Newton</i>-discovered Fast X-ray Transients: host galaxies and limits on contemporaneous detections of optical counterparts
dc.typeartículo
dc.volumen527
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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