Astronomy and Astrophysics – Astronomy
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.1606w&link_type=abstract
American Astronomical Society, 192nd AAS Meeting, #16.06; Bulletin of the American Astronomical Society, Vol. 30, p.842
Astronomy and Astrophysics
Astronomy
Scientific paper
The sub-parsec masing disk recently found to be orbiting a ~ 10(7) solar mass black hole in the Seyfert 2 galaxy, NGC 4258, provides the most compelling evidence to date for the existence of a massive black hole in the nucleus of a galaxy. The disk is edge-on, the X-ray spectrum is heavily absorbed, and an active nucleus is visible in polarised light. Nearly all AGNs which contain maser sources and have X-ray observations show strong X-ray absorption consistent with an edge-on disk, suggesting that many of them may harbour active nuclei in their cores. We have made SAX observations of the Seyfert 2 galaxy ESO103-G35, which contains a nuclear maser source and is known to be heavily absorbed in the X-rays. We present preliminary analysis of the X-ray spectrum which extends up to ~ 200 keV with no detectable contribution from a reflected component, shows a ~ 300 keV equivalent width, cold, narrow Fe Kalpha line and absorption, N_H ~ 2 x 10(23) cm(-2) , consistent with earlier results.
Antonelli Angelo
Fiore Fabrizio
Mathur Smita
Wilkes Belinda
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