Details

Autor(en) / Beteiligte

• O’Connor, B.
• Brink, J.
• Buckley, D. A. H.
• Mukai, K.
• Kouveliotou, C.
• Göğüş, E.
• Potter, S. B.
• Woudt, P.
• Lien, A.
• Levan, A.
• Kargaltsev, O.
• Baring, M. G.
• Bellm, E.
• Cenko, S. B.
• Evans, P. A.
• Granot, J.
• Hailey, C.
• Harrison, F.
• Hartmann, D.
• van der Horst, A. J.
• Huppenkothen, D.
• Kaper, L.
• Kennea, J. A.
• Slane, P. O.
• Stern, D.
• Troja, E.
• Wijers, R. A. M. J.
• Younes, G.

Titel

Identification of 1RXS J165424.6-433758 as a Polar Cataclysmic Variable

Ist Teil von

• The Astrophysical journal, 2023-11, Vol.957 (2), p.89

Ort / Verlag

Philadelphia: IOP Publishing

Erscheinungsjahr

2023

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Abstract 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) × 10 31 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 λ 4640 Bowen blend, almost a dozen He i lines, and He ii λ 4541, λ 4686, and λ 5411. 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.