NuSTAR catches the unveiling nucleus of NGC 1068

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 performe...

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Detalles Bibliográficos
Autores: 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.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2016
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/127741
Acceso en línea:https://hdl.handle.net/2445/127741
Access Level:acceso abierto
Palabra clave:Galàxies actives
Observacions astronòmiques
Active galaxies
Astronomical observations
Descripción
Sumario: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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