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 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007cxo..prop.2432r&link_type=abstract

Chandra Proposal ID #09700497

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Chandra Proposal Id #09700497

Scientific paper

We propose two ~3 weeks monitoring campaigns consisting of five 10 ks observations each, of two Seyfert Galaxies which were observed both in reflection-dominated and in transmission-dominated states in past observations. The aim is to detect such dramatic variations on time scales of a few days. A Chandra monitoring campaign 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. 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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