XMM–Newton confirmation of a new intermediate polar: XMMU J185330.7−012815

Authors

  • C. Y. Hui,

    Corresponding author
    1. Department of Astronomy and Space Science, Chungnam National University, Daejeon 305–764, Republic of Korea
      E-mail: cyhui@cnu.ac.kr
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  • K. Sriram,

    1. International Center for Astrophysics, Korea Astronomy and Space Science Institute, 36–1 Hwaam, Yuseong, Daejeon 305–348, Republic of Korea
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  • C.-S. Choi

    1. International Center for Astrophysics, Korea Astronomy and Space Science Institute, 36–1 Hwaam, Yuseong, Daejeon 305–348, Republic of Korea
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E-mail: cyhui@cnu.ac.kr

ABSTRACT

We report on the results of a detailed spectro-imaging and temporal analysis of an archival XMM–Newton observation of a new intermediate polar XMMU J185330.7−012815. Its X-ray spectrum can be well described by a multitemperature thermal plasma model with the K lines of heavy elements clearly detected. Possible counterparts of XMMU J185330.7−012815 have been identified in optical and ultraviolet (UV) bands. The low values of the inferred X-ray-to-UV and X-ray-to-optical flux ratios safely rule out the possibility of its being an isolated neutron star. We confirm the X-ray periodicity of ∼238 s but, differently from the previous preliminary results, we do not find any convincing evidence of phase shift in this observation. We further investigate its properties through an energy-resolved temporal analysis and find that the pulsed fraction monotonically increases with energy.

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