Chandra observation of the Sgr B2 cloud: X-ray Reflection Nebula and past activities of our Galactic center

Details Chandra observation of the Sgr B2 cloud: X-ray Reflection Nebula and past activities of our Galactic center Chandra observation of the Sgr B2 cloud: X-ray Reflection Nebula and past activities of our Galactic center

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.4414m&link_type=abstract

American Astronomical Society, HEAD Meeting #5, #44.14; Bulletin of the American Astronomical Society, Vol. 32, p.1653

Astronomy and Astrophysics

Astronomy

Scientific paper

We present Chandra observation of the giant molecular cloud Sgr B2 at the Galactic center region. With high spatial resolution of Chandra, we can resolve 17 point sources from 3' x 3.5′ region inside of the cloud. In particular, we detect a few sources from the Sgr B2M core, including the possible counterpart of IRAS 17441-2822 with the large absorption of about 1024 H cm-2. We also obtain the detailed structure of the diffuse emission, which shows a convex shape pointed towards Galactic nucleus Sgr A*. The spectrum of the diffuse emission is very peculiar; it exhibits the very strong neutral iron line with the equivalent width of above 1 keV and the large absorption of about 1024 H cm-2. These features support the ``X-ray reflection nebula" hypothesis, in which the cloud is irradiated by an external X-ray source and emits fluorescent and scattered X-rays. We also argue the contribution of the point sources inside the cloud to the fluorescent X-rays, and reveal the past activities of the Galactic center.

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