Timing and Spectral Study of AXJ1745.6-2901 with Suzaku

Details Timing and Spectral Study of AXJ1745.6-2901 with Suzaku Timing and Spectral Study of AXJ1745.6-2901 with Suzaku

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009pasj...61s..99h&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.61, No.SP1, pp.S99--S106

Astronomy and Astrophysics

Astronomy

2

Galaxy: Center, Ism: Dust, X-Rays: Binaries, X-Rays: Individual (Ax J1745.6-2901)

Scientific paper

The eclipsing low-mass X-ray binary AX J1745.6-2901 was observed with Suzaku in its outburst phase. Combining the Chandra observation made 1.5 month earlier than Suzaku, we determined the orbital period to be 30063.76±0.14s. We found deep flux dips prior to the eclipse phase of the orbit. The X-ray spectrum of the persistent phase is described by a combination of a direct and a scattered-in components by dust emission. During the eclipse, the X-ray spectrum becomes only the dust scattering (scattered-in) component. The optical depth of the dust scattering is ˜10.5 at 1keV. The direct component is composed of a blackbody likely from the neutron-star surface and a disk-blackbody. No power-law component is found in the hard energy band up to 30keV. A clear edge at ˜7.1keV in the deep dip spectrum indicates that the major portion of Fe in the absorber is neutral, or in a low ionization state. We discovered four narrow absorption lines near the K-shell transition energies of FeXXV, FeXXVI, and NiXXVII. The absorption line features are well explained by the solar abundance gas in a bulk motion of ˜103 km s-1.

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