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Title: NuSTAR catches the unveiling nucleus of NGC 1068
Author: Marinucci, A.
Bianchi, S.
Matt, G.
Alexander, D. M.
Baloković, M.
Bauer, F. E.
Brandt, W. N.
Gandhi, P.
Guainazzi, M.
Harrison, F. A.
Iwasawa, Kazushi
Koss, M.
Madsen, K. K.
Nicastro, F.
Puccetti, S.
Ricci, C.
Stern, D.
Walton, D. J.
Keywords: Galàxies actives
Observacions astronòmiques
Active galaxies
Astronomical observations
Issue Date: Feb-2016
Publisher: Royal Astronomical Society
Abstract: We present a NuSTAR and XMM-Newton monitoring campaign in 2014/2015 of the Comptonthick Seyfert 2 galaxy, NGC 1068. During the 2014 August observation, we detect with NuSTAR a flux excess above 20 keV (32 ± 6 per cent) with respect to the 2012 December observation and to a later observation performed in 2015 February. We do not detect any spectral variation below 10 keV in the XMM-Newton data. The transient excess can be explained by a temporary decrease of the column density of the obscuring material along the line of sight (from NH 1025 cm−2 to NH = 6.7 ± 1.0 × 1024 cm−2), which allows us for the first time to unveil the direct nuclear radiation of the buried active galactic nucleus in NGC 1068 and to infer an intrinsic 2-10 keV luminosity LX =7+7−4×1043 erg s−1.
Note: Reproducció del document publicat a:
It is part of: Monthly Notices of the Royal Astronomical Society, 2016, vol. 456, num. 1, p. L94-L98
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ISSN: 0035-8711
Appears in Collections:Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

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