학술논문
Identification of 1RXS J165424.6-433758 as a polar cataclysmic variable
Document Type
Working Paper
Author
O'Connor, B.; Brink, J.; Buckley, D. A. H.; Mukai, K.; Kouveliotou, C.; Gogus, 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.
Source
Subject
Language
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 \textit{Swift} Deep Galactic Plane Survey (DGPS). The source X-ray spectrum (\textit{Swift} and \textit{NuSTAR}) is described by thermal bremsstrahlung radiation with a temperature of $kT=10.1\pm1.2$ keV, yielding an X-ray ($0.3-10$ keV) luminosity $L_X=(6.5\pm0.8)\times10^{31}$ erg s$^{-1}$ at a \textit{Gaia} distance of 460 pc. Spectroscopy with the Southern African Large Telescope (SALT) revealed a flat continuum dominated by emission features, demonstrating an inverse Balmer decrement, the $\lambda4640$ Bowen blend, almost a dozen HeI lines, and HeII $\lambda4541$, $\lambda4686$ and $\lambda 5411$. Our high-speed photometry demonstrates a preponderance of flickering and flaring episodes, and revealed the orbital period of the system, $P_\textrm{orb}=2.87$ hr, which fell well within the cataclysmic variable (CV) period gap between $2-3$ hr. These features classify 1RXS J165424.6-433758 as a nearby polar magnetic CV.
Comment: Accepted for publication in ApJ
Comment: Accepted for publication in ApJ