2010/05/01 by Shinya Nakashima, Masayoshi Nobukawa, Takeshi Go Tsuru +2
Physics and Astronomy · #Astrophysical Phenomena and Observations #Astrophysics and Cosmic Phenomena #Flare #Line (geometry) #Molecular cloud #Plasma #Relativity and Gravitational Theory #Sagittarius A* #Spectral line #Supernova #Supernova remnant #astro-ph.HE
paper · pdf · doi:10.1093/pasj/62.4.971
10 pages, 8 figures, accepted for publication in PASJ (Vol.62, No.4)
arxiv created 2010/05/01 · openalex publication_date 2010/08/25 · arxiv updated 2016/06/08 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Abstract 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.