A Super Bubble Candidate in the Galactic Center and a Local Enhancement G359.77-0.09

Abstract

A 20' \times 16' elliptical ring-like structure has been found near the Galactic center in the narrow energy band corresponding to the K$\alpha$ line from He-like sulfur. In the ring, two diffuse sources are found, a supernova remnant candidate G359.79-0.26 and an unidentified source G359.77-0.09. The X-ray spectrum of G359.77-0.09 is similar to that of G359.79-0.26, which can be explained by an absorbed thin thermal plasma model with temperatures of 0.7 and 1.0 keV. The absorption column densities of these two sources are large (N_H = 6.9 \times 10^{22} and 4.5 \times 10^{22} cm^{-2}) and are consistent with that of the Galactic center distance. The X-ray spectrum extracted from the ring-like structure is also represented by an absorbed thin thermal plasma model (kT_e \sim 0.9 keV). The thermal energy of the plasma filling the ring-like structure is estimated to be 1.0 \times 10^{51} erg. We therefore propose that the two sources comprise a single ring-like object, which is possibly a super bubble with a size of 49 pc \times 40 pc in the Galactic center region.

9 pages, 7 figures, accepted for publication in PASJ

References in corpus (8)

• Monte-Carlo Simulator and Ancillary Response Generator of Suzaku XRT/XIS System for Spatially Extended Source Analysis
• Reproducibility of Non-X-ray Background for the X-ray Imaging Spectrometer aboard Suzaku
• Iron and Nickel Line Diagnostics for the Galactic Center Diffuse Emission
• A Chandra/ACIS Study of 30 Doradus I. Superbubbles and Supernova Remnants
• A Chandra Catalog of X-ray Sources in the Central 150 pc of the Galaxy
• Performance of the Charge Injection Capability of Suzaku XIS
• Suzaku Observations of the North Polar Spur: Evidence for Nitrogen Enhancement
• Suzaku Observation of 30Dor C: A Supernova Remnant with the Largest Non-Thermal Shell

Cited by in corpus (5)

• The XMM-Newton view of the central degrees of the Milky Way
• Diffuse X-Ray Sky in the Galactic Center
• XMM-Newton observations of the Galactic Centre Region - II: The soft thermal emission
• Origin of the low-temperature plasma in the Galactic center X-ray emission
• High Energy Emission from the Galactic Center