X-ray Eclipse of the AGN in NGC 1365: Measuring the Source Size

Details X-ray Eclipse of the AGN in NGC 1365: Measuring the Source Size X-ray Eclipse of the AGN in NGC 1365: Measuring the Source Size

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008rmxac..32..112r&link_type=abstract

The Nuclear Region, Host Galaxy and Environment of Active Galaxies (Eds. Erika Benítez, Irene Cruz-González, & Yair Krongold) Re

Astronomy and Astrophysics

Astronomy

Galaxies: Active, X-Rays: Galaxies

Scientific paper

I present a study of the extraordinary X-ray absorption variability of the obscured Seyfert Galaxy NGC 1365. A Chandra campaign of six short observations within ten days revealed an eclipse of the X-ray source in two days. Furthermore, an analysis of the spectral variability in a 60 ks long XMM-Newton observation, when the source was in a Compton-thin state, revealed a transition of an obscuring cloud with N_H ˜ 3×10(23) cm(-2) in ˜ 60 ks. These observations constrain the X-ray source size to < 10(14) cm and the distance of the obscuring cloud to < 10(16) cm.

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