Mathematics – Logic
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...20925410m&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #254.10; Bulletin of the American Astronomical Society,
Mathematics
Logic
Scientific paper
Based on three years of deep observations of the Galactic center with the Chandra X-ray Observatory, we report the discovery of changes in the intensities and morphologies of two hard X-ray nebulosities. The nebulosities are dominated by fluorescent iron emission, and are coincident with molecular clouds. The morphological changes are manifest on parsec scales, which requires that these iron features are scattered X-rays from a 2 or 3-year-long outburst of a point source (either Sgr A* or an X-ray binary) with a luminosity of at least 1e37 erg/s. The variability precludes the hypotheses that these nebulae either are produced by keV electrons bombarding molecular clouds, or are iron-rich ejecta from supernovae. Moreover, the morphologies of the reflection nebulae implies that the dense regions of the clouds are filamentary, with widths of 0.3 pc and lengths of 2 pc.
Baganoff Frederick Keith
Brandt Wiliam N.
Morris Mark R.
Muno Michael P.
Park Sahnggi
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