February 28, 2002
Chandra Deep X-ray Observation of the Galactic Plane
Using the Chandra X-ray satellite, we have carried out the deepest X-ray
observation on a typical Galactic plane region.
Our main motivations were
We have detected more than 270 new X-ray sources in the two Chandra mosaic
fields (~25'x25'). There seems to be two populations of sources, soft spectral
sources which are bright only below 2 keV, and hard ones which are
conspicuous above 2 keV. In the hard X-ray band (2-10 keV), we found the point
source X-ray flux account for only ~10 % of the total energy flux observed
in the field of view, that indicates that the Galactic hard X-ray emission
has truly diffuse nature.
We also found the surface density of the hard X-ray sources is comparable to
that in high Galactic regions, which strongly suggest most of the hard X-ray
sources we detected are extragalactic AGNs seen through the Galactic plane.
- to examine if the Galactic plane hard X-ray emission is truly
diffuse emission or composed of numerous point sources, and
- to investigate the nature of the dimmest X-ray sources on the
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