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Detection of Nonthermal X-ray structures near the Galactic Center with Chandra

  • Atsushi Senda (a1), Katsuji Koyama (a2), Ken Ebisawa (a3), Jun Kataoka (a4) and Yoshiaki Sofue (a5)...

Abstract

We have discovered a number of nonthermal X-ray features within central 40 pc region of the Galactic center by analysing 600-ksec observations of Chandra archival data. Most of the detected X-ray structures exhibit small-scale knot-like morphologies and their spectra are well reproduced by single hard power-law with photon indices of 1-2. Among them, the most outstanding features are the three X-ray knots which are aligned on a straight line from the potition of Sgr A* to north-northwest direction. The X-ray properties of these knots lead us to suspect that they are X-ray jets ejected from Sgr A* in the recent past. In addition, we have obtained an indication that the summed flux of nonthermal diffuse X-rays within 30 pc of the GC seems to be smoothly connected to the 20-100 keV flux detected with INTEGRAL IBIS/ISGRI. These results suggest that the origin of GC hard X-rays (or High energy Gamma-rays) is not (or partly) from the Galactic nucleus.

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Keywords

Detection of Nonthermal X-ray structures near the Galactic Center with Chandra

  • Atsushi Senda (a1), Katsuji Koyama (a2), Ken Ebisawa (a3), Jun Kataoka (a4) and Yoshiaki Sofue (a5)...

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