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NuSTAR catches the unveiling nucleus of NGC 1068
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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.
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MARINUCCI, A., et al. NuSTAR catches the unveiling nucleus of NGC 1068. Monthly Notices of the Royal Astronomical Society. 2016. Vol. 456, num. 1, pags. L94-L98. ISSN 0035-8711. [consulted: 19 of August of 2026]. Available at: https://hdl.handle.net/2445/127741