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

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

doi:10.3847/1538-4357/acf831

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

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

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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) × 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.

Original language	English
Article number	89
Journal	Astrophysical Journal
Volume	957
Issue number	2
DOIs	https://doi.org/10.3847/1538-4357/acf831
State	Published - 1 Nov 2023

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Publisher Copyright:
© 2023. The Author(s). Published by the American Astronomical Society.

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10.3847/1538-4357/acf831

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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., ... Younes, G. (2023). Identification of 1RXS J165424.6-433758 as a Polar Cataclysmic Variable. Astrophysical Journal, 957(2), Article 89. https://doi.org/10.3847/1538-4357/acf831

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title = "Identification of 1RXS J165424.6-433758 as a Polar Cataclysmic Variable",

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) × 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.",

author = "B. O{\textquoteright}Connor and J. Brink and Buckley, {D. A.H.} and K. Mukai and C. Kouveliotou and E. G{\"o}ğ{\"u}{\c s} and Potter, {S. B.} and P. Woudt and A. Lien and A. Levan and O. Kargaltsev and Baring, {M. G.} and E. Bellm and Cenko, {S. B.} and Evans, {P. A.} and J. Granot and C. Hailey and F. Harrison and D. Hartmann and {van der Horst}, {A. J.} and D. Huppenkothen and L. Kaper and Kennea, {J. A.} and Slane, {P. O.} and D. Stern and E. Troja and Wijers, {R. A.M.J.} and G. Younes",

note = "Publisher Copyright: {\textcopyright} 2023. The Author(s). Published by the American Astronomical Society.",

year = "2023",

month = nov,

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doi = "10.3847/1538-4357/acf831",

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O’Connor, B, Brink, J, Buckley, DAH, Mukai, K, Kouveliotou, C, Göğüş, E, Potter, SB, Woudt, P, Lien, A, Levan, A, Kargaltsev, O, Baring, MG, Bellm, E, Cenko, SB, Evans, PA, Granot, J, Hailey, C, Harrison, F, Hartmann, D, van der Horst, AJ, Huppenkothen, D, Kaper, L, Kennea, JA, Slane, PO, Stern, D, Troja, E, Wijers, RAMJ & Younes, G 2023, 'Identification of 1RXS J165424.6-433758 as a Polar Cataclysmic Variable', Astrophysical Journal, vol. 957, no. 2, 89. https://doi.org/10.3847/1538-4357/acf831

TY - JOUR

T1 - Identification of 1RXS J165424.6-433758 as a Polar Cataclysmic Variable

AU - O’Connor, B.

AU - Brink, J.

AU - Buckley, D. A.H.

AU - Mukai, K.

AU - Kouveliotou, C.

AU - Göğüş, E.

AU - Potter, S. B.

AU - Woudt, P.

AU - Lien, A.

AU - Levan, A.

AU - Kargaltsev, O.

AU - Baring, M. G.

AU - Bellm, E.

AU - Cenko, S. B.

AU - Evans, P. A.

AU - Granot, J.

AU - Hailey, C.

AU - Harrison, F.

AU - Hartmann, D.

AU - van der Horst, A. J.

AU - Huppenkothen, D.

AU - Kaper, L.

AU - Kennea, J. A.

AU - Slane, P. O.

AU - Stern, D.

AU - Troja, E.

AU - Wijers, R. A.M.J.

AU - Younes, G.

PY - 2023/11/1

Y1 - 2023/11/1

N2 - 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.

AB - 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.

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VL - 957

JO - Astrophysical Journal

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ER -

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

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