Absorption Variability in NGC 1365 seen with XMM-Newton and NuSTAR
Abstract
Between July 2012 and February 2013, XMM-Newton and NuSTAR performed four long-look joint observations of the type 2 Seyfert NGC 1365 with the aim of measuring relativistic reflection from the inner region of the accretion disk. Fortuitously, two of observations caught the source in an unusually low absorption state, and one of these observation actually showed an uncovering of the central source. We have analyzed the variable absorption seen in these observations in order to characterize the geometry of the absorbing material in this source. In addition to a constant (likely distant) absorber with a column density of N_{H} ∼1 × 10^{22} cm^{-2}, we find a variable absorber with a range of N_{H} from 5-25 × 10^{22} cm^{-2} and a range of covering fractions from ∼0.5-1 over the course of the four observations. This is consistent with the picture of a clumpy torus/BLR with the clumps embedded in a smoother, more diffuse medium.
- Publication:
-
The X-ray Universe 2014
- Pub Date:
- July 2014
- Bibcode:
- 2014xru..confE.310R