Identification of 1RXS J165424.6-433758 as a polar cataclysmic variable

O’Connor, B. and Brink, J. and Buckley, D. A.H. and Mukai, K. and Kouveliotou, C. and Göğüş, Ersin and Potter, S. B. and Woudt, P. and Lien, A. and Levan, A. and Kargaltsev, O. and Baring, M. G. and Bellm, E. and Cenko, S. B. and Evans, P. A. and Granot, J. and Hailey, C. and Harrison, F. and Hartmann, D. and van der Horst, A. J. and Huppenkothen, D. and Kaper, L. and Kennea, J. A. and Slane, P. O. and Stern, D. and Troja, E. and Wijers, R. A. M. J. and Younes, G. (2023) Identification of 1RXS J165424.6-433758 as a polar cataclysmic variable. Astrophysical Journal, 957 (2). ISSN 0004-637X (Print) 1538-4357 (Online)

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We present the results of our X-ray, ultraviolet, and optical follow-up campaigns of 1RXS J165424.6-433758, an X-ray source detected with the Swift Deep Galactic Plane Survey. The source X-ray spectrum (Swift and NuSTAR) is described by thermal bremsstrahlung radiation with a temperature of kT = 10.1 ± 1.2 keV, yielding an X-ray (0.3-10 keV8) luminosity L X = (6.5 ± 0.8) × 1031 erg s−1 at a Gaia distance of 460 pc. Spectroscopy with the Southern African Large Telescope revealed a flat continuum dominated by emission features, demonstrating an inverse Balmer decrement, the λ4640 Bowen blend, almost a dozen He i lines, and He ii λ4541, λ4686, and λ5411. Our high-speed photometry demonstrates a preponderance of flickering and flaring episodes, and revealed the orbital period of the system, P orb = 2.87 hr, which fell well within the cataclysmic variable (CV) period gap between 2 and 3 hr. These features classify 1RXS J165424.6-433758 as a nearby polar magnetic CV.
Item Type: Article
Divisions: Faculty of Engineering and Natural Sciences
Depositing User: Ersin Göğüş
Date Deposited: 06 Feb 2024 15:39
Last Modified: 06 Feb 2024 15:39

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