Identification of a new ultraluminous X-ray source in NGC 1316

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dc.authoridaksaker, nazim/0000-0001-8721-5036
dc.authoridALLAK, Dr. Sinan/0000-0001-7093-1079
dc.authoridAKYUZ, AYSUN/0000-0001-9533-9805
dc.authoridSoydugan, Faruk/0000-0002-5141-7645
dc.authoridavdan, senay/0000-0001-8986-8022
dc.authoridOZDOGAN ELA, Melike/0000-0003-2354-4839
dc.contributor.authorAllak, S.
dc.contributor.authorAkyuz, A.
dc.contributor.authorAksaker, N.
dc.contributor.authorEla, M. Ozdogan
dc.contributor.authorAvdan, S.
dc.contributor.authorSoydugan, Faruk
dc.date.accessioned2025-01-27T20:59:51Z
dc.date.available2025-01-27T20:59:51Z
dc.date.issued2020
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractIn this study, we report identification of a newultraluminous X-ray source (ULX) named as X-7 inNGC1316, with an unabsorbed luminosity of 2.1 x 10(39) erg s(-1) using the two recent Chandra archival observations. The X-7 was detected in the Chandra 2001 observation and was included in the source list of the NGC 1316 as CXOUJ032240.8-371224 with a luminosity of 5.7 x 10(38) erg s(-1). Present luminosity implies a luminosity increase of a factor of similar to 4. The best-fitting spectral model parameters indicate that X-7 has a relatively hot disc and hard spectra. If explained by a disc blackbody model, the mass of compact object is estimated as similar to 8 M-circle dot which is in the range of a stellar-mass black hole. The X-7 shows a relatively long-term count rate variability while no short-term variability is observed. We also identified a unique optical candidate within 0.22 arcsec error circle at 95 per cent confidence level for X-7 using the archival HST/ACS (Hubble Space Telescope/Advanced Camera for Surveys) and HST/WFC3 (The Wide Field Camera 3) data. Absolute magnitude (M-V) of this candidate is -7.8 mag. Its spectral energy distribution is adequately fitted a blackbody model with a temperature of 3100 K indicating an M type supergiant, assuming the donor star dominates the optical emission. In addition, we identified a transient ULX candidate (XT-1) located 6 arcsec away from X-7 has a (high) luminosity of similar to 10(39) erg s(-1) with no visible optical candidate.
dc.description.sponsorshipScientific and Technological Research Council of Turkey (TUBITAK) [117F115]; Cukurova University Research Fund [FBA-2019-11803]; TUBITAK
dc.description.sponsorshipThis research was supported by the Scientific and Technological Research Council of Turkey (TUBITAK) through project number 117F115. This research was also supported by the Cukurova University Research Fund through project number FBA-2019-11803. This research is a part of the PhD thesis of S. Allak and he acknowledges financial support by TUBITAK. Our special thanks toM. E. Ozel for his valuable contributions of the manuscript.
dc.identifier.doi10.1093/mnras/staa3073
dc.identifier.endpage5689
dc.identifier.issn0035-8711
dc.identifier.issn1365-2966
dc.identifier.issue4
dc.identifier.scopus2-s2.0-85096903467
dc.identifier.scopusqualityQ1
dc.identifier.startpage5682
dc.identifier.urihttps://doi.org/10.1093/mnras/staa3073
dc.identifier.urihttps://hdl.handle.net/20.500.12428/26858
dc.identifier.volume499
dc.identifier.wosWOS:000599131700074
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.subjectgalaxies: individual (NGC 1316)
dc.subjectX-rays: binaries
dc.subjectX-rays: general
dc.titleIdentification of a new ultraluminous X-ray source in NGC 1316
dc.typeArticle

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