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NuSTAR catches the unveiling nucleus of NGC 1068

NuSTAR catches the unveiling nucleus of NGC 1068
NuSTAR catches the unveiling nucleus of NGC 1068
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?4×1043 erg s?1
0035-8711
L94-L98
Gandhi, Poshak
5bc3b5af-42b0-4dd8-8f1f-f74048d4d4a9
Gandhi, Poshak
5bc3b5af-42b0-4dd8-8f1f-f74048d4d4a9

Gandhi, Poshak (2015) NuSTAR catches the unveiling nucleus of NGC 1068. Monthly Notices of the Royal Astronomical Society, 456 (1), L94-L98. (doi:10.1093/mnrasl/slv178).

Record type: Article

Abstract

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?4×1043 erg s?1

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Accepted/In Press date: 10 November 2015
Published date: 17 December 2015
Organisations: Astronomy Group

Identifiers

Local EPrints ID: 396270
URI: http://eprints.soton.ac.uk/id/eprint/396270
ISSN: 0035-8711
PURE UUID: 5da29e44-0c0d-437b-aeab-8262f51e2caa
ORCID for Poshak Gandhi: ORCID iD orcid.org/0000-0003-3105-2615

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Date deposited: 02 Jun 2016 13:46
Last modified: 17 Dec 2019 01:34

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Author: Poshak Gandhi ORCID iD

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