Issue |
A&A
Volume 410, Number 2, November I 2003
|
|
---|---|---|
Page(s) | L5 - L8 | |
Section | Letters | |
DOI | https://doi.org/10.1051/0004-6361:20031355 | |
Published online | 17 November 2003 |
Letter to the Editor
Faint hard X-ray sources in the Galactic Center region: Supernova ejecta fragments population
AF Ioffe Institute for Physics and Technology, St. Petersburg 194021, Russia
Corresponding author: byk@astro.ioffe.ru
Received:
2
May
2003
Accepted:
3
September
2003
Long Chandra observations of field in the Galactic Center (GC) region reported by Muno
et al. ([CITE]) have revealed a population of about 2000 hard faint
X-ray sources limited by luminosities
. We show that fast moving knots (FMKs) of supernovae ejecta
could comprise a sizeable fraction of the sources. Each supernova
event can produce hundreds of FMKs. The presence of ~3
supernova remnants of age ∼103
in the GC
region could provide the required number of the FMKs. Simulated
X-ray spectra of the FMKs contain both thermal and nonthermal
components. The nonthermal spectra are power-laws with hard photon
indexes
and prominent lines of some
metals (e.g. Fe).
The
–
distribution and the hardness
ratios of the FMKs in the GC region are consistent with the
Chandra findings. Spatial distribution of the
FMKs in the GC region should appear as an
ensemble of coherent shell and jet-like structures of a few
arcmin-scale.
Key words: acceleration of particles / radiation mechanisms: non-thermal / ISM / clouds / ISM: individual object: Galactic Center / ISM: supernova remnants / X-rays: diffuse background
© ESO, 2003
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