Discovery of a new X-ray transient source in the scutum region with Suzaku
PASJ_59SP12944.pdf 236 KB
stars: individual (Suzaku J1844-0404)
During an observation of the Galactic plane in the Scutum region with the Suzaku satellite, we discovered a new X-ray transient source, designated Suzaku J1844-0404. Compared with previous Chandra observations of the same field, four Chandra X-ray sources exist within the current positional uncertainty of Suzaku J1844-0404. A firm identification is not possible. From the beginning of the observation, the X-ray intensity was significant at ∼ 5×10-14 erg s-1 cm-2 (2–10 keV), which may be a possible precursor. Later, the source exhibited a flare with a peak flux of ∼ 10-12 erg s-1 cm-2 (2–10 keV). A strong and narrow emission line at ∼ 6.66 keV was observed during the flare, most likely the He-like Fe line. The spectrum in 1–10 keV is consistent with a heavily absorbed (NH ∼3×1022Hcm-2) thin thermal emission with kT as high as ∼7keV. A single short flare, as observed, is rather unlikely for a cataclysmic variable. The source is probably an active binary star or a young stellar object.
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