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New Transient ULX Candidate in NGC 4254: Evidence of Circumbinary Disk?
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New Transient ULX Candidate in NGC 4254: Evidence of Circumbinary Disk?
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This paper presents the identification of a new transient ULX candidate (ULX-3) with reaching a peak luminosity of ~ 4e39 erg/s in NGC 4254 by using archival Chandra, Swift X-Ray Telescope (Swift/XRT), Hubble Space Telescope (HST), and James Webb Space Telescope (JWST) observations. From precise astrometric calculations, unique optical, near-infrared (NIR) and mid-infrared (mid-IR) counterparts were found. The spectral energy distribution (SED) and color-magnitude diagrams (CMDs) of counterparts of the new ULX candidate were plotted to constrain the nature of the possible donor star. Evidence of a circumbinary disk was found from its SED with two blackbody temperatures of 1000 and 200 K. Moreover, according to the X-ray hardness ratios, ULX-3 exhibits very hard to very soft transitions as seen in some high-mass X-ray binaries (HMXBs) with Be-star donors Moreover, ULX-3 varies by more than two orders of magnitude in the 0.3-10 keV energy band as seen in typical transient ULXs.
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Cited by 1 Pith paper
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Transient and Variable Ultra-luminous X-ray Sources in NGC 4552
Archival Chandra and XMM-Newton observations reveal two transient X-ray sources in NGC 4552 exceeding 10^39 erg/s, classifying them as new transient ULXs.
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