NuSTAR catches the unveiling nucleus of NGC 1068

A. Marinucci; S. Bianchi; G. Matt; D. M. Alexander; M. Baloković; F. E. Bauer; W. N. Brandt; P. Gandhi; M. Guainazzi; F. A. Harrison; K. Iwasawa; M. Koss; K. K. Madsen; F. Nicastro; S. Puccetti; C. Ricci; D. Stern; D. J. Walton

doi:10.1093/mnrasl/slv178

NuSTAR catches the unveiling nucleus of NGC 1068

A. Marinucci, S. Bianchi, G. Matt, D. M. Alexander, M. Baloković, F. E. Bauer, W. N. Brandt, P. Gandhi, M. Guainazzi, F. A. Harrison, K. Iwasawa, M. Koss, K. K. Madsen, F. Nicastro, S. Puccetti, C. Ricci, D. Stern, D. J. Walton

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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.

Original language	English (US)
Pages (from-to)	L94-L98
Journal	Monthly Notices of the Royal Astronomical Society: Letters
Volume	456
Issue number	1
DOIs	https://doi.org/10.1093/mnrasl/slv178
State	Published - Feb 11 2016

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1093/mnrasl/slv178

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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, K., Koss, M., Madsen, K. K., Nicastro, F., Puccetti, S., Ricci, C., Stern, D., & Walton, D. J. (2016). NuSTAR catches the unveiling nucleus of NGC 1068. Monthly Notices of the Royal Astronomical Society: Letters, 456(1), L94-L98. https://doi.org/10.1093/mnrasl/slv178

@article{160fb463678649368c47c9453ac5cc22,

title = "NuSTAR catches the unveiling nucleus of NGC 1068",

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.",

author = "A. Marinucci and S. Bianchi and G. Matt and Alexander, {D. M.} and M. Balokovi{\'c} and Bauer, {F. E.} and Brandt, {W. N.} and P. Gandhi and M. Guainazzi and Harrison, {F. A.} and K. Iwasawa and M. Koss and Madsen, {K. K.} and F. Nicastro and S. Puccetti and C. Ricci and D. Stern and Walton, {D. J.}",

note = "Publisher Copyright: {\textcopyright} 2015 The Authors.",

year = "2016",

month = feb,

day = "11",

doi = "10.1093/mnrasl/slv178",

language = "English (US)",

volume = "456",

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Marinucci, A, Bianchi, S, Matt, G, Alexander, DM, Baloković, M, Bauer, FE, Brandt, WN, Gandhi, P, Guainazzi, M, Harrison, FA, Iwasawa, K, Koss, M, Madsen, KK, Nicastro, F, Puccetti, S, Ricci, C, Stern, D & Walton, DJ 2016, 'NuSTAR catches the unveiling nucleus of NGC 1068', Monthly Notices of the Royal Astronomical Society: Letters, vol. 456, no. 1, pp. L94-L98. https://doi.org/10.1093/mnrasl/slv178

TY - JOUR

T1 - NuSTAR catches the unveiling nucleus of NGC 1068

AU - Marinucci, A.

AU - Bianchi, S.

AU - Matt, G.

AU - Alexander, D. M.

AU - Baloković, M.

AU - Bauer, F. E.

AU - Brandt, W. N.

AU - Gandhi, P.

AU - Guainazzi, M.

AU - Harrison, F. A.

AU - Iwasawa, K.

AU - Koss, M.

AU - Madsen, K. K.

AU - Nicastro, F.

AU - Puccetti, S.

AU - Ricci, C.

AU - Stern, D.

AU - Walton, D. J.

PY - 2016/2/11

Y1 - 2016/2/11

N2 - 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.

AB - 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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DO - 10.1093/mnrasl/slv178

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VL - 456

SP - L94-L98

JO - Monthly Notices of the Royal Astronomical Society: Letters

JF - Monthly Notices of the Royal Astronomical Society: Letters

IS - 1

ER -

NuSTAR catches the unveiling nucleus of NGC 1068

Abstract

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