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

Details XMM-Newton confirmation of a new intermediate polar: XMMU J185330.7-012815 XMM-Newton confirmation of a new intermediate polar: XMMU J185330.7-012815

2011-08-24

arxiv.org/abs/1108.4895v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

9 pages, 4 figures, 1 table, accepted for publication in MNRAS

Scientific paper

We report the results from 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 multi-temperature 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 UV bands. The low value of the inferred X-ray-to-UV and X-ray-to-optical flux ratios help to safely rule out the possibility as an isolated neutron star. We confirm the X-ray periodicity of ~238 s, but different from the previous preliminary result, 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 the pulsed fraction monotonically increases with energy.

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