Short-time monitoring of the extreme variations in NGC~1365

Details Short-time monitoring of the extreme variations in NGC~1365 Short-time monitoring of the extreme variations in NGC~1365

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005cxo..prop.2003r&link_type=abstract

Chandra Proposal ID #07700678

Physics

Chandra Proposal Id #07700678

Scientific paper

We propose six 15 ks Chandra ACIS-S observations - one every 2-3 days - of the exceptional variable Seyfert 1.8 galaxy NGC 1365, which challenges accepted ideas of the standard Unified Model of AGNs. Our request is based on the past XMM and Chandra observations of this source, which revealed transitions from Compton-thick to Compton-thin states in 3 weeks, and column density variability on a timescale of a few hours. We show that monitoring which fills the gap between the length of a single observation (~1 day) and the delay between the closest observations (3 weeks) would allow us to constrain the physics and geometry of the absorbing/reflecting gas with unprecedented detail, and would represent a significant step forward in our understanding of the circumnuclear medium in AGNs.

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