Detection of 125.5-day optical periodic modulation of the neutron star M51 ULX-8

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dc.authoridALLAK, Dr. Sinan/0000-0001-7093-1079
dc.contributor.authorAllak, S.
dc.date.accessioned2025-01-27T21:05:44Z
dc.date.available2025-01-27T21:05:44Z
dc.date.issued2022
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractStudying Ultraluminous X-ray sources (ULXs) in the optical wavelengths provides important clues about the accretion mechanisms and the evolutionary processes of X-ray binary systems. In this study, three (C1, C2, and C3) possible optical counterparts were identified for well-known neutron star (NS) candidate M51 ULX-8 through advanced astrometry based on the Chandra and Hubble Space Telescope (HST) observations, as well as the GAIA optical source catalogue. Optical periodic modulation of 125.5 d with an amplitude of 0.14 mag was determined for C3, which has evidence to represent the optical nature of ULX-8 using one-year (2016-2017) 34 HST Advanced Camera for Surveys (ACS)/Wide Field Camera (WFC) observations. Moreover, surprisingly, the observed optical fluxes of C3 exhibit a bi-modal distribution. This could mean that there is a possible correlation between the optical and the X-ray flux variabilities of the ULX-8. The possible scenarios which are frequently mentioned in the literature proposed for the nature of optical emission and optical super-orbital period. The most probable scenario is that the optical emission could have originated from the accretion disc of the ULX-8.
dc.identifier.doi10.1093/mnras/stac2887
dc.identifier.endpage3504
dc.identifier.issn0035-8711
dc.identifier.issn1365-2966
dc.identifier.issue3
dc.identifier.scopus2-s2.0-85145255550
dc.identifier.scopusqualityQ1
dc.identifier.startpage3495
dc.identifier.urihttps://doi.org/10.1093/mnras/stac2887
dc.identifier.urihttps://hdl.handle.net/20.500.12428/27776
dc.identifier.volume517
dc.identifier.wosWOS:000872711900004
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherOxford Univ Press
dc.relation.ispartofMonthly Notices of The Royal Astronomical Society
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_WoS_20250125
dc.subjectastrometry
dc.subjectgalaxies: individual: M51 ULX-8
dc.subjectX-rays: binaries: Optical counterparts of M51 ULX-8
dc.titleDetection of 125.5-day optical periodic modulation of the neutron star M51 ULX-8
dc.typeArticle

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