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The Multi-Layer Variable Absorbers in NGC 1365 Revealed by XMM-Newton and NuSTARBetween 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 approximately 10 (sup 23) per square centimeter 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 approximately 10 (sup 22) per square centimeter 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 approximately 1 by 10 (sup 22) per square centimeter is also present, though the location of this low density haze is unknown.
Document ID
20160010534
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Rivers, E.
(California Inst. of Tech. Pasadena, CA, United States)
Risaliti, G.
(Osservatorio Astrofisico Arcetri Florence, Italy)
Walton, D. J.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Harrison, F.
(California Inst. of Tech. Pasadena, CA, United States)
Arevalo, P.
(Universidad Catolica de Valparaiso Valparaiso, Chile)
Baur, F. E.
(Pontificia Univ. Catolica de Chile Santiago, Chile)
Boggs, S. E.
(California Univ. Berkeley, CA, United States)
Brenneman, L. W.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Brightman, M.
(California Inst. of Tech. Pasadena, CA, United States)
Zhang, W. W.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
August 23, 2016
Publication Date
May 7, 2015
Publication Information
Publication: The Astrophysical Journal
Publisher: The American Astronomical Society
Volume: 804
Issue: 2 107
e-ISSN: 2041-8213
Subject Category
Astronomy
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN35013
Funding Number(s)
CONTRACT_GRANT: NNG08FD60C
Distribution Limits
Public
Copyright
Other
Keywords
galaxies: active aEuro" galaxies: individual (NGC 1365) aEuro" X-rays: galaxies

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