Suzaku Observations of the Great Annihilator and the Surrounding Diffuse Emissions

Details Suzaku Observations of the Great Annihilator and the Surrounding Diffuse Emissions Suzaku Observations of the Great Annihilator and the Surrounding Diffuse Emissions

Aug 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010pasj...62..971n&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.62, No.4, pp.971--979

Astronomy and Astrophysics

Astronomy

Galaxy: Center, Ism: Clouds, Ism: Supernova Remnants, X-Rays: Individual (Great Annihilator)

Scientific paper

We report the Suzaku observations of 1E 1740.7-2942, a black hole candidate called the ``Great Annihilator'' (GA). The high-quality spectrum of Suzaku provides the severest constraints on the parameters of the GA. Two clumpy structures are found around the GA in the line images of FeI Kα at 6.4 keV and SXV Kα at 2.45 keV. One clump, named M 359.23-0.04, exhibits the 6.4-keV line with an equivalent width of ˜1.2 keV, and is associated with a molecular cloud in the radio CS (J = 1-0) map. Thus, the 6.4-keV line from M 359.23-0.04 is likely due to X-ray fluorescence irradiated by an external X-ray source. The irradiating X-rays would be either a past flare of Sagittarius A* or a bright nearby source, the GA. The other clump, named G 359.12-0.05, is associated with the radio supernova remnant candidate G 359.07-0.02. We therefore propose that G 359.12-0.05 is an X-ray counterpart of G 359.07-0.02. G 359.12-0.05 has a thin thermal plasma spectrum with a temperature of kT ˜ 0.9 keV. The plasma parameters of G 359.12-0.05 are consistent with those of a single supernova remnant in the Galactic center region.

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