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Swift/XRT Deep Galactic Plane Survey Discovery of a New Intermediate Polar Cataclysmic Variable, Swift J183920.1-045350

Gorgone, Nicholas M. and Woudt, Patrick A. and Buckley, David and Mukai, Koji and Kouveliotou, Chryssa and Huppenkothen, Daniela and Göğüş, Ersin and Bellm, Eric and Linford, Justin D. and van der Horst, Alexander J. and Baring, Matthew G. and Hartmann, Dieter and Barrett, Paul and Cenko, Bradley and Graham, Melissa and Granot, Johnathan and Harrison, Fiona and Kennea, Jamie and O’Connor, Brendan M. and Potter, Stephen and Stern, Daniel and Slane, Patrick and Wijers, Ralph (2021) Swift/XRT Deep Galactic Plane Survey Discovery of a New Intermediate Polar Cataclysmic Variable, Swift J183920.1-045350. Astrophysical Journal, 923 (2). Art. No. 243. ISSN 0004-637X. doi:10.3847/1538-4357/ac2738.

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We report on the Swift/XRT Deep Galactic Plane Survey discovery and multiwavelength follow-up observations of a new intermediate polar (IP) cataclysmic variable, Swift J183920.1-045350. A 449.7 s spin period is found in XMM-Newton and NuSTAR data, accompanied by a 459.9 s optical period that is most likely the synodic, or beat period, produced from a 5.6 hr orbital period. The orbital period is seen with moderate significance in independent long-baseline optical photometry observations taken with the ZTF and SAAO telescopes. We find that the X-ray pulse fraction of the source decreases with increasing energy. The X-ray spectra are consistent with the presence of an Fe emission line complex with both local and interstellar absorption. In the optical spectra, strong Hα, H i, He i, and He ii emission lines are observed, all common features in magnetic CVs. The source properties are thus typical of known IPs, with the exception of its estimated distance of 2.26_(−0.83)^(+1.93) kpc, which is larger than typical, extending the reach of the CV population in our Galaxy.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Gorgone, Nicholas M.0000-0002-1653-6411
Woudt, Patrick A.0000-0002-6896-1655
Buckley, David0000-0002-7004-9956
Mukai, Koji0000-0002-8286-8094
Kouveliotou, Chryssa0000-0003-1443-593X
Huppenkothen, Daniela0000-0002-1169-7486
Göğüş, Ersin0000-0002-5274-6790
Bellm, Eric0000-0001-8018-5348
Linford, Justin D.0000-0002-3873-5497
van der Horst, Alexander J.0000-0001-9149-6707
Baring, Matthew G.0000-0003-4433-1365
Hartmann, Dieter0000-0002-8028-0991
Barrett, Paul0000-0002-8456-1424
Cenko, Bradley0000-0003-1673-970X
Graham, Melissa0000-0002-9154-3136
Granot, Johnathan0000-0001-8530-8941
Harrison, Fiona0000-0003-2992-8024
Kennea, Jamie0000-0002-6745-4790
O’Connor, Brendan M.0000-0002-9700-0036
Potter, Stephen0000-0002-5956-2249
Stern, Daniel0000-0003-2686-9241
Slane, Patrick0000-0002-6986-6756
Wijers, Ralph0000-0002-3101-1808
Alternate Title:Probing the reach of the Intermediate Polar Cataclysmic Variable Population with Swift J183920.1-045350
Additional Information:© 2021. The American Astronomical Society. Received 2021 April 10; revised 2021 September 10; accepted 2021 September 14; published 2021 December 24. The authors wish to thank Sylvia Rose Kowalski and Deena Mickelson for their roles in VLA data acquisition. They also thank Hannes Breytenbach for taking some of the SAAO data. P.A.W. acknowledges financial support from the University of Cape Town and the National Research Foundation. The SALT observations reported here were obtained through the SALT Large Science program 2018-2-LSP-001, with D.B. as PI, who also acknowledges support of the National Research Foundation. C.K. and N.G. acknowledge support under NASA grant 80NSSC19K0916 and Smithsonian Astrophysical Observatory grant GO9-20057X. B.O. is supported in part by the National Aeronautics and Space Administration through grants NNX16AB66G, NNX17AB18G, and 80NSSC20K0389. We thank the NRAO for the generous allocation of VLA time for our observations. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. This work has made use of data from the European Space Agency mission Gaia, processed by the Gaia Data Processing and Analysis Consortium (DPAC, Funding for the DPAC has been provided by national institutions participating in the Gaia Multilateral Agreement. Facilities: Swift - Swift Gamma-Ray Burst Mission, NuSTAR - , XMM-Newton - , Chandra - , SALT - , SAAO - , Gaia - , Pan-STARRS - , ZTF - , APO - , VLA - . Software: casa (McMullin et al. 2007), heasoft (v6.23; Nasa High Energy Astrophysics Science Archive Research Center (Heasarc), 2014), ds9 (Joye & Mandel 2003; Smithsonian Astrophysical Observatory 2000), sas (v1.2; Gabriel et al. 2004), pyspeckit (Ginsburg & Mirocha 2011), stingray (Huppenkothen et al. 2019, v0.1;), ciao (Fruscione et al. 2006, v4.9;), pydis (Davenport 2019), pysalt package (Crawford et al. 2010), python 3 (Van Rossum & Drake 2009), iraf (Tody 1986, 1993), vartools (Hartman & Bakos 2016)
Group:Space Radiation Laboratory, NuSTAR, Astronomy Department
Funding AgencyGrant Number
Southern African Large Telescope (SALT)2018-2-LSP-001
National Research Foundation (South Africa)UNSPECIFIED
Smithsonian Astrophysical ObservatoryGO9-20057X
Gaia Multilateral AgreementUNSPECIFIED
Subject Keywords:Cataclysmic variable stars; DQ Herculis stars
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Cataclysmic variable stars (203); DQ Herculis stars (407)
Record Number:CaltechAUTHORS:20220119-572561000
Persistent URL:
Official Citation:Nicholas M. Gorgone et al 2021 ApJ 923 243
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:112989
Deposited By: George Porter
Deposited On:19 Jan 2022 22:58
Last Modified:19 Jan 2022 22:58

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