Journal article · Preprint article
The multi-layer variable absorbers in NGC 1365 revealed by XMM-Newton and NuSTAR
California Institute of Technology1
National Institute for Astrophysics2
Harvard-Smithsonian Center for Astrophysics3
Universidad de Valparaíso4
Pontifícia Universidade Católica5
University of California at Berkeley6
National Space Institute, Technical University of Denmark7
Astrophysics, National Space Institute, Technical University of Denmark8
Between 2012 July and 2013 February, NuSTAR and XMM-Newton performed four long-look joint observations of the type 1.8 Seyfert, NGC 1365. We have analyzed the variable absorption seen in these observations in order to characterize the geometry of the absorbing material. Two of the observations caught NGC 1365 in an unusually low absorption state, revealing complexity in the multi-layer absorber that had previously been hidden.
We find the need for three distinct zones of neutral absorption in addition to the two zones of ionized absorption and the Compton-thick torus previously seen in this source. The most prominent absorber is likely associated with broad-line region clouds with column densities of around ~1023 cm-2 and a highly clumpy nature as evidenced by an occultation event in 2013 February.
We also find evidence of a patchy absorber with a variable column around ~1022 cm-2 and a line-of-sight covering fraction of 0.3-0.9, which responds directly to the intrinsic source flux, possibly due to a wind geometry. A full-covering, constant absorber with a low column density of ~1 × 1022 cm-2 is also present, though the location of this low density haze is unknown.
Language: | English |
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Publisher: | American Astronomical Society |
Year: | 2015 |
Pages: | 107 |
ISSN: | 15384357 and 0004637x |
Types: | Journal article and Preprint article |
DOI: | 10.1088/0004-637X/804/2/107 |
ORCIDs: | Christensen, Finn Erland , 0000-0002-5116-3868 , 0000-0003-1468-9526 and 0000-0003-2686-9241 |