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Rea, N; Zelati, F. Coti; Esposito, P; D'Avanzo, P; de Martino, D; Israel, G. L; Torres, D. F; Campana, S; Belloni, T. M; Papitto, A; Masetti, N; Carrasco, L; Possenti, A; Wieringa, M; Wilhelmi, E. De Oña; Li, J; Bozzo, E; Ferrigno, C; Linares, M; Tauris, T. M; Hernanz, M; Ribas, I; Monelli, M; Borghese, A; Baglio, M. C; Casares, J
Monthly notices of the Royal Astronomical Society, 11/2017, Volume: 471, Issue: 3Journal Article, Publication
Abstract In a search for the counterpart to the Fermi-LAT source 3FGL J0838.8−2829, we performed a multiwavelength campaign: in the X-ray band with Swift and XMM–Newton; in the infrared and optical with OAGH, ESO-NTT and IAC80; and in the radio with ATCA observations. We also used archival hard X-ray data obtained by INTEGRAL. We report on three X-ray sources consistent with the position of the Fermi-LAT source. We confirm the identification of the brightest object, RX J0838−2827, as a magnetic cataclysmic variable that we recognize as an asynchronous system (not associated with the Fermi-LAT source). RX J0838−2827 is extremely variable in the X-ray and optical bands, and timing analysis reveals the presence of several periodicities modulating its X-ray and optical emission. The most evident modulations are interpreted as being caused by the binary system orbital period of ∼1.64 h and the white dwarf spin period of ∼1.47 h. A strong flux modulation at ∼15 h is observed at all energy bands, consistent with the beat frequency between spin and orbital periods. Optical spectra show prominent Hβ, He i and He ii emission lines that are Doppler-modulated at the orbital period and at the beat period. Therefore, RX J0838−2827 accretes through a disc-less configuration and could be either a strongly asynchronous polar or a rare example of a pre-polar system on its way to reaching synchronism. Regarding the other two X-ray sources, XMM J083850.4−282759 showed a variable X-ray emission, with a powerful flare lasting for ∼600 s, similar to what is observed in transitional millisecond pulsars during the subluminous disc state: this observation possibly means that this source can be associated with the Fermi-LAT source.
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