Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pasj...59s.215y&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.59, No.SP1, pp.215-220
Astronomy and Astrophysics
Astronomy
1
Stars: Flare, Stars: Individual (Suzaku J1844-0404), X-Rays: Spectra, X-Rays: Stars, X-Rays: Transients
Scientific paper
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 (2-10keV), which may be a possible precursor. Later, the source exhibited a flare with a peak flux of ˜ 10-12 erg s-1 cm-2 (2-10keV). 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 1-10keV is consistent with a heavily absorbed (NH ˜ 3 × 1022 H cm-2) thin thermal emission with kT as high as ˜ 7 keV. 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.
Bamba Aya
Ebisawa Ken
Ishida Manabu
Iwasawa Kazushi
Kokubun Motohide
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