Optical counterparts of ULXs in two dwarf galaxies: NGC 4861 and NGC 4449

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dc.authorid0000-0001-7093-1079en_US
dc.authorscopusid57207762938en_US
dc.authorwosid-en_US
dc.contributor.authorÖzdoğan Ela, M.
dc.contributor.authorAkyüz, A.
dc.contributor.authorAksaker, N.
dc.contributor.authorAvdan, S.
dc.contributor.authorOralhan, I. Akkaya
dc.contributor.authorVinokurov, A.
dc.contributor.authorAllak, S.
dc.date.accessioned2023-05-16T06:52:42Z
dc.date.available2023-05-16T06:52:42Z
dc.date.issued2021en_US
dc.departmentFakülteler, Fen Fakültesi, Fizik Bölümü
dc.description.abstractWe present the results of a search for optical candidates of ultraluminous X-ray sources (ULXs) in two dwarf galaxies, NGC 4861 and NGC 4449, using Hubble Space Telescope (HST) archival data. With precise astrometry, we confirm that NGC 4861 X1 is associated with an H II complex and we conclude that NGC 4861 X2 resides in a young star group of mass 400 ± 80 M☉. We also find that NGC 4449 X7 is associated with three optical candidates within an error radius of 0.2 arcsec at the 90 per cent confidence level. Absolute magnitudes (Mv) of these candidates are determined as −5.0 and −4.1. The age and mass values for the three candidates are estimated as 40–50 Myr and ∼8 M☉, respectively, using stellar evolutionary tracks. The locations of optical candidates suggest a possible association with a nearby group of stars. In addition, we analysed previously unused archival data of XMM–Newton, Chandra, and Swift where the sources were detected. Although the X-ray spectral data do not allow us to discriminate between physical models, long-term data at hand are consistent with the sources being in luminous hard states.en_US
dc.identifier.citationÖzdogan Ela, M., Akyüz, A., Aksaker, N., Avdan, S., Akkaya Oralhan, I., Vinokurov, A., . . . Bizyaev, D. (2021). Optical counterparts of ULXs in two dwarf galaxies: NGC 4861 and NGC 4449. Monthly Notices of the Royal Astronomical Society, 505(1), 771-782. doi:10.1093/mnras/stab1321en_US
dc.identifier.doi10.1093/mnras/stab1321
dc.identifier.endpage782en_US
dc.identifier.issn0035-8711
dc.identifier.issn1365-2966
dc.identifier.issue1en_US
dc.identifier.scopus2-s2.0-85108548900
dc.identifier.startpage771en_US
dc.identifier.urihttps://doi.org/10.1093/mnras/stab1321
dc.identifier.urihttps://hdl.handle.net/20.500.12428/4170
dc.identifier.volume505en_US
dc.identifier.wosWOS:000671453100054
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthorAllak, Sinan
dc.language.isoen
dc.publisherOxford University Pressen_US
dc.relation.ispartofMonthly Notices of the Royal Astronomical Societyen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.relation.tubitakinfo:eu-repo/grantAgreement/TUBITAK/SOBAG/117F115
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectGalaxiesen_US
dc.subjectIndividualen_US
dc.subjectNGC4861–galaxiesen_US
dc.subjectNGC4449–X-raysen_US
dc.subjectBinariesen_US
dc.titleOptical counterparts of ULXs in two dwarf galaxies: NGC 4861 and NGC 4449
dc.typeArticle

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