Hard X-ray view of the past activity of Sgr A in a natural Compton mirror

@article{Revnivtsev2004HardXV,
  title={Hard X-ray view of the past activity of Sgr A in a natural Compton mirror},
  author={Mikhail G. Revnivtsev and Eugene M. Churazov and Sergei Y. Sazonov and Rashid Alievich Sunyaev and Alexander A. Lutovinov and Marat Gilfanov and Alexey Vikhlinin and P. Shtykovsky and Masayuki Iki and Moscow and Russia. and -- Mpa and Garching and H Germany and - CfA and Cambridge and Usa},
  journal={Astronomy and Astrophysics},
  year={2004},
  volume={425}
}
We report the association of the recently discovered hard X-ray source IGR J17475−2822 with the giant molecular cloud Sgr B2 in the Galactic Center region. The broad band (3-200 keV) spectrum of the source constructed from data of different observatories strongly supports the idea that the X-ray emission of Sgr B2 is Compton scattered and reprocessed radiation emitted in the past by the Sgr Asource. We conclude that 300-400 years ago Sgr Awas a low luminosity (L ≈ 1.5 × 10 39 erg s −1 at 2-200… Expand

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References

SHOWING 1-10 OF 31 REFERENCES
Chandra Observations of Diffuse X-Rays from the Sagittarius B2 Cloud
We present the first Chandra results of the giant molecular cloud Sagittarius B2 (Sgr B2), located about 100 pc away from the Galactic center. Diffuse X-rays are clearly separated fromExpand
Chandra X-Ray Spectroscopic Imaging of Sagittarius A* and the Central Parsec of the Galaxy
We report the results of the first-epoch observation with the ACIS-I instrument on the Chandra X-Ray Observatory of Sagittarius A* (Sgr A*), the compact radio source associated with the supermassiveExpand
X-Ray-emitting Young Stars in the Orion Nebula
The Orion Nebula Cluster and the molecular cloud in its vicinity have been observed with the ACIS-I detector on board the Chandra X-ray Observatory with 23 hr exposure in two observations. We detectExpand
Characteristics of diffuse X-ray line emission within 20 parsecs of the Galactic center
Over the last three years, the Galactic center region has been monitored with the Chandra X-Ray Observatory. Besides the X-ray emission from the target object, Sgr A*, diffuse X-ray emission wasExpand
ASCA Discovery of Diffuse 6.4 keV Emission near the Sagittarius C Complex: A New X-Ray Reflection Nebula
We present an ASCA discovery of diffuse hard X-ray emission from the Sgr C complex with its peak in the vicinity of the molecular cloud core. The X-ray spectrum is characterized by a strong 6.4 keVExpand
ASCA OBSERVATIONS OF THE SAGITTARIUS B2 CLOUD: AN X-RAY REFLECTION NEBULA
We present the ASCA results of imaging spectroscopy of the giant molecular cloud Sgr B2. The X-ray spectrum is found to be very peculiar; it exhibits a strong emission line at 6.4 keV, a low-energyExpand
On Search and Detection of Hard X-Ray Emission from Orion-Like Complexes Produced by a Flux of Subrelativistic Nuclei
We analyze the origin of the Orion 7-rays discovered by the COMPTEL telescope and possibilities to search Orion-like sources with X-ray telescopes. We have shown that if these 7-rays are produced byExpand
EQUIVALENT WIDTH, SHAPE AND PROPER MOTION OF THE IRON FLUORESCENT LINE EMISSION FROM MOLECULAR CLOUDS AS AN INDICATOR OF THE ILLUMINATING SOURCE X-RAY FLUX HISTORY
Observations of the diffuse emission in the 8–22 keV energy range, elongated parallel to the Galactic plane, and detection of the strong 6.4-keV fluorescent line with ∼ 1 keV equivalent width fromExpand
X{ray emission from the giant molecular clouds in the Galactic Center region and the discovery of new X{ray sources
We report the results of X{ray (2{10 keV) observations of the giant molecular clouds Sgr B, Sgr C and Sgr D in the Galactic Center region, together with the discovery of the point-like source SAXExpand
XMM‐Newton observation of the galactic centre – evidence against the X‐ray reflection nebulae model?
We present preliminary results of a 50 ksec XMM-Newton observation of the Galactic Centre. Due to the excellent spectral resolution of XMM-Newton combined with its high throughput at energies evenExpand
...
1
2
3
4
...