Absorption from a multi-layer circumnuclear medium and reflection from the accretion disc in NGC 1365
Abstract
NGC 1365 hosts an X-ray obscured AGN known for both its variable absorption and its relativistic features in the reflection component. Recent simultaneous observations performed by XMM-Newton and NuSTAR caught the source in a rare, nearly unobscured state, revealing the presence of a warm absorber and a neutral, but low column density (∼ 1022 cm-2) absorber, usually not observable due to thicker layers along the line of sight. Here I propose a multi-layer structure of the circumnuclear medium which can explain all the observed absorption states of this source, and their variability properties. Remarkably, despite the spectral complexity due to this multi-component absorber, the relativistic reflection component (and hence the black hole spin) can be unambiguously measured through a time resolved spectroscopic analysis.
- Publication:
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Astronomische Nachrichten
- Pub Date:
- May 2016
- DOI:
- 10.1002/asna.201612342
- Bibcode:
- 2016AN....337..529R
- Keywords:
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- accretion;
- accretion disks;
- black hole physics;
- galaxies: active;
- galaxies: individual (NGC 1365);
- galaxies: nuclei;
- X-rays: galaxies