Short-time monitoring of extreme spectral variations in Seyfert 2s

Details Short-time monitoring of extreme spectral variations in Seyfert 2s Short-time monitoring of extreme spectral variations in Seyfert 2s

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008cxo..prop.2622r&link_type=abstract

Chandra proposal ID #10700125

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Scientific paper

We propose two 3 weeks monitoring campaigns of five 10 ks observations, of two Seyfert Galaxies, found in both reflection-dominated and transmission-dominated states in past observations. The aim is to detect such variations on time scales of a few days. A Chandra monitoring analogous to the ones proposed here, performed in 2006 on NGC 1365 provided a spectacular result: a spectral change from Compton-thin to Compton-thick and back to Compton-thin in four days. One more campaign completed just a few days before this deadline on UGC 4203 provided similar results.If found in other sources, these extreme variations would demonstrate that the thick absorber in Seyfert Galaxies is extremely compact (on the spatial scale of the broad line region).

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