Computer Science
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000cxo..prop..726m&link_type=abstract
Chandra Proposal ID #02708043
Computer Science
Chandra Proposal Id #02708043
Scientific paper
The Circinus Galaxy is one of the nearest AGN and the brightest Compton-thick Seyfert 2. Due to heavy obscuration, below 10 keV the spectrum is dominated by a reflection component, the nucleus starting to be observable above 20 keV. No evidence for variability was present before we observed the Circinus Galaxy with BeppoSAX on 2001 January 7. The source has dramatically changed with since June 2000 both in flux and spectral shape. Below 10 keV, the flux increases by almost 50%,the spectrum becoming steeper. Above that energy, the change was much smaller, if any. There are two explanations: a) A past variation of the nuclear emission echoed by the reflection component. b) A burst from a off-center source reaching the luminosity of 10**40 erg/s, as that observed in M82 and attributed to accretion onto a black hole with a few hundred times the solar mass BeppoSAX cannot solve this ambiguity. Only a high angular resolution observation with Chandra can do it.
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