Detection of nonthermal X-ray structures near the galactic center with Chandra

Atsushi Senda; Katsuji Koyama; Ken Ebisawa; Jun Kataoka; Yoshiaki Sofue; Bosch-Ramon; Pietsch

doi:10.1017/S174392130600771X

Detection of nonthermal X-ray structures near the galactic center with Chandra

Atsushi Senda, Katsuji Koyama, Ken Ebisawa, Jun Kataoka, Yoshiaki Sofue, Bosch-Ramon, Pietsch

Research output: Contribution to journal › Article › peer-review

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
Issue number	S230
DOIs	https://doi.org/10.1017/S174392130600771X
Publication status	Published - 2005
Externally published	Yes

Keywords

Galaxy: center
ISM: jets and outflows
X-rays: ISM

ASJC Scopus subject areas

Medicine (miscellaneous)
Astronomy and Astrophysics
Nutrition and Dietetics
Public Health, Environmental and Occupational Health
Space and Planetary Science

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title = "Detection of nonthermal X-ray structures near the galactic center with Chandra",

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.",

keywords = "Galaxy: center, ISM: jets and outflows, X-rays: ISM",

author = "Atsushi Senda and Katsuji Koyama and Ken Ebisawa and Jun Kataoka and Yoshiaki Sofue and Bosch-Ramon and Pietsch",

year = "2005",

doi = "10.1017/S174392130600771X",

language = "English",

volume = "1",

pages = "24--28",

journal = "Proceedings of the International Astronomical Union",

issn = "1743-9213",

publisher = "Cambridge University Press",

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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

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JO - Proceedings of the International Astronomical Union

JF - Proceedings of the International Astronomical Union

SN - 1743-9213

IS - S230

ER -

Detection of nonthermal X-ray structures near the galactic center with Chandra

Abstract

Keywords

ASJC Scopus subject areas

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