Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/44353
 Title: X-ray properties of two transient ULX candidates in galaxy NGC 7090 Authors: Liu, ZO'Brien, PTOsborne, JPEvans, PAPage, KL First Published: 2-May-2019 Publisher: Oxford University Press (OUP), Royal Astronomical Society Citation: Monthly Notices of the Royal Astronomical Society, 2019, 486, pp. 5709–5715 Abstract: We report the X-ray data analysis of two transient ultraluminous X-ray sources (ULXs, hereafter X1 and X2) located in the nearby galaxy NGC 7090. While they were not detected in the 2004 XMM-Newton and 2005 Chandra observations, their 0.3-10 keV X-ray luminosities reached $>3\times10^{39}\,\mathrm{erg\,s^{-1}}$ in later XMM-Newton or Swift observations, showing increases in flux by a factor of $>80$ and $>300$ for X1 and X2, respectively. X1 showed indications of spectral variability: at the highest luminosity, its X-ray spectra can be fitted with a powerlaw ($\Gamma=1.55\pm0.15$), or a multicolour disc model with $T_{\mathrm{in}}=2.07^{+0.30}_{-0.23}$ keV; the X-ray spectrum became softer ($\Gamma=2.67^{+0.69}_{-0.64}$), or cooler ($T_\mathrm{in}=0.64^{+0.28}_{-0.17}$ keV) at lower luminosity. No strong evidence for spectral variability was found for X2. Its X-ray spectra can be fitted with a simple powerlaw model ($\Gamma=1.61^{+0.55}_{-0.50}$), or a multicolour disc model ($1.69^{+1.17}_{-0.48}$ keV). A possible optical counterpart for X1 is revealed in HST imaging. No optical variability is found, indicating that the optical radiation may be dominated by the companion star. Future X-ray and optical observations are necessary to determine the true nature of the compact object. DOI Link: 10.1093/mnras/stz1194 eISSN: 1365-2966 Links: https://academic.oup.com/mnras/article/486/4/5709/5484889http://hdl.handle.net/2381/44353 Version: Publisher Version Status: Peer-reviewed Type: Journal Article Rights: Copyright © 2019, Oxford University Press (OUP), Royal Astronomical Society. Deposited with reference to the publisher’s open access archiving policy. (http://www.rioxx.net/licenses/all-rights-reserved) Appears in Collections: Published Articles, Dept. of Physics and Astronomy

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