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

Published online by Cambridge University Press:  12 May 2006

Atsushi Senda ,
Katsuji Koyama ,
Ken Ebisawa ,
Jun Kataoka  and
Yoshiaki Sofue
Atsushi Senda
Affiliation:
Cosmic Radiation Laboratory, RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan email: [email protected]
Katsuji Koyama
Affiliation:
Cosmic Ray Group, Department of Physics, Graduate School of Science, Kyoto University
Ken Ebisawa
Affiliation:
Center for Planning and Information syntems, ISAS/JAXA
Jun Kataoka
Affiliation:
Department of physics, Faculty of Science, Tokyo Institute of Technology
Yoshiaki Sofue
Affiliation:
Institute of Astronomy, University of Tokyo
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Abstract

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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.

Keywords

Galaxy: centerX-rays: ISMISM: jets and outflows
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Symposium S230: Populations of High Energy Sources in Galaxies , August 2005 , pp. 24 - 28
Copyright
2006 International Astronomical Union