The X-ray Transient 2XMMi J003833.3+402133: A Candidate Magnetar at High Galactic Latitude

Abstract

We present detailed analysis of the transient X-ray source 2XMMi J003833.3+402133 detected by XMM-Newton in January 2008 during a survey of M 31. The X-ray spectrum is well fitted by either a steep power law plus a blackbody model or a double blackbody model. Prior observations with XMM-Newton, Chandra, Swift and ROSAT spanning 1991 to 2007, as well as an additional Swift observation in 2011, all failed to detect this source. No counterpart was detected in deep optical imaging with the Canada France Hawaii Telescope down to a 3sigma lower limit of g = 26.5 mag. This source has previously been identified as a black hole X-ray binary in M 31. While this remains a possibility, the transient behaviour, X-ray spectrum, and lack of an optical counterpart are equally consistent with a magnetar interpretation for 2XMMi J003833.3+402133. The derived luminosity and blackbody emitting radius at the distance of M 31 argue against an extragalactic location, implying that if it is indeed a magnetar it is located within the Milky Way but 22deg out of the plane. The high Galactic latitude could be explained if 2XMMi J003833.3+402133 were an old magnetar, or if its progenitor was a runaway star that traveled away from the plane prior to going supernova.

16 pages, 5 figures, 4 tables, accepted for publication in ApJ following moderate revision

References in corpus (17)

• X-ray Properties of Black-Hole Binaries
• Modelling the behaviour of accretion flows in X-ray binaries
• The XMM-Newton Serendipitous Survey. V. The Second XMM-Newton Serendipitous Source Catalogue
• The Haunted Halos of Andromeda and Triangulum: A panorama of galaxy formation in action
• A low-magnetic-field Soft Gamma Repeater
• The causal connection between disc and power-law variability in hard state black hole X-ray binaries
• Refining the fundamental plane of accreting black holes
• The Compact X-ray Source 1E 1547.0-5408 and the Radio Shell G327.24-0.13: A New Proposed Association between a Candidate Magnetar and a Candidate Supernova Remnant
• On the Possibility of Identification of a Short/Hard Burst GRB 051103 with the Giant Flare from a Soft Gamma Repeater in the M81 Group of Galaxies
• The deep XMM-Newton Survey of M 31
• An Ultraviolet Study of Star-Forming Regions in M31
• Discovery and Monitoring of a new Black Hole Candidate XTE J1752-223 with RXTE: RMS spectrum evolution, BH mass and the source distance
• Very deep X-ray observations of the Anomalous X-ray Pulsar 4U 0142+614
• An unified timing and spectral model for the Anomalous X-ray Pulsars XTE J1810-197 and CXOU J164710.2-455216
• Black hole candidate XTE J1752-223: Swift observations of canonical states during outburst
• XMM-Newton Observations of the Cataclysmic Variable GW Lib
• A New 626 s Periodic X-ray Source in the Direction of the Galactic Center

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