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NuSTAR catches the unveiling nucleus of NGC 1068.

Marinucci, A. and Bianchi, S. and Matt, G. and Alexander, D.M. and Baloković, M. and Bauer, F.E. and Brandt, W.N. and Gandhi, P. and Guainazzi, M. and Harrison, F.A. and Iwasawa, K. and Koss, M. and Madsen, K.K. and Nicastro, F. and Puccetti, S. and Ricci, C. and Stern, D. and Walton, D.J. (2016) 'NuSTAR catches the unveiling nucleus of NGC 1068.', Monthly notices of the Royal Astronomical Society : letters., 456 (1). L94-L98.


We present a NuSTAR and XMM–Newton monitoring campaign in 2014/2015 of the Compton-thick 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+7−4×1043X=7−4+7×1043 erg s−1.

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Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society: Letters ©: 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:10 November 2015
Date deposited:15 June 2016
Date of first online publication:17 December 2015
Date first made open access:No date available

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