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.
| Original language | English |
|---|---|
| Pages (from-to) | 24-28 |
| Number of pages | 5 |
| Journal | Proceedings of the International Astronomical Union |
| Volume | 1 |
| DOIs | |
| Publication status | Published - 2005 |
| Externally published | Yes |
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Keywords
- Galaxy: center
- ISM: jets and outflows
- X-rays: ISM
ASJC Scopus subject areas
- Astronomy and Astrophysics
Cite this
Detection of nonthermal X-ray structures near the galactic center with Chandra. / Senda, Atsushi; Koyama, Katsuji; Ebisawa, Ken; Kataoka, Jun; Sofue, Yoshiaki; Bosch-Ramon; Pietsch.
In: Proceedings of the International Astronomical Union, Vol. 1, 2005, p. 24-28.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Detection of nonthermal X-ray structures near the galactic center with Chandra
AU - Senda, Atsushi
AU - Koyama, Katsuji
AU - Ebisawa, Ken
AU - Kataoka, Jun
AU - Sofue, Yoshiaki
AU - Bosch-Ramon,
AU - Pietsch,
PY - 2005
Y1 - 2005
N2 - 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.
AB - 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.
KW - Galaxy: center
KW - ISM: jets and outflows
KW - X-rays: ISM
UR - http://www.scopus.com/inward/record.url?scp=63549093147&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=63549093147&partnerID=8YFLogxK
U2 - 10.1017/S174392130600771X
DO - 10.1017/S174392130600771X
M3 - Article
AN - SCOPUS:63549093147
VL - 1
SP - 24
EP - 28
JO - Proceedings of the International Astronomical Union
JF - Proceedings of the International Astronomical Union
SN - 1743-9213
ER -