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2007MNRAS.377..607P - Mon. Not. R. Astron. Soc., 377, 607-616 (2007/May-2)
Rapid NH changes in NGC 4151.
PUCCETTI S., FIORE F., RISALITI G., CAPALBI M., ELVIS M. and NICASTRO F.
Abstract (from CDS):
The overall absorption during the 2001 December observation is lower than in all other historical observations with similar 2-10 keV flux. This suggests that absorption variability plays a crucial role in the observed flux variability of this source.
Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS
Journal keyword(s): Galaxies: individual: NGC 4151 - Galaxies: Seyfert - X-rays: galaxies
Simbad objects: 6
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