Optical counterparts of two candidate ultraluminous x-ray sources in NGC 4536

Avdan, H. and Sonbas, E. and Dhuga, K. S. and Vinokurov, A. and Göğüş, Ersin and Avdan, S. and Solovyeva, Y. N. and Kostenkov, A. E. and Shablovinskaya, E. S. and Goktas, D. (2023) Optical counterparts of two candidate ultraluminous x-ray sources in NGC 4536. Monthly Notices of the Royal Astronomical Society, 521 (4). pp. 5298-5307. ISSN 0035-8711 (Print) 1365-2966 (Online)

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Archival XMM-Newton, Chandra, and Hubble Space Telescope(HST) data have been used to study the X-ray and optical properties of two candidate ultraluminous X-ray sources in NGC 4536. In order to search for potential optical counterparts, relative astrometry between Chandra and HST was improved, and as a result, optical counterparts were detected for both X-ray sources. To complement our findings (based on the archival data), ground-based optical spectra of the counterparts were obtained with the 6-m BTA (Big Telescope Alt-azimuth) Telescope located at the Special Astrophysical Observatory. The calculated redshift (z = 0.4391 ± 0.0010) for one of the sources (X-3) indicates that the source is, in fact, a background active galactic nucleus. Two possible optical counterparts (s1 and s2) were found for X-2. Whether s1 is point-like or an extended source is unclear: If it is point-like and the emission is dominated by the donor, its spectral type indicates O-B star. The second source (s2) is point-like and is consistent with the colours and absolute magnitudes of a red supergiant.
Item Type: Article
Uncontrolled Keywords: galaxies: individual: NGC 4536; X-rays: binaries
Divisions: Faculty of Engineering and Natural Sciences
Depositing User: Ersin Göğüş
Date Deposited: 06 Aug 2023 15:13
Last Modified: 06 Aug 2023 15:13
URI: https://research.sabanciuniv.edu/id/eprint/47249

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