NuSTAR catches the unveiling nucleus of NGC 1068

A. Marinucci, S. Bianchi, G. Matt, D. M. Alexander, M. Baloković, F. E. Bauer, William Nielsen 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

Research output: Contribution to journalArticle

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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 ≃ 10 25 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 × 10 43 erg s -1 .

Original languageEnglish (US)
Pages (from-to)L94-L98
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume456
Issue number1
DOIs
StatePublished - Jan 1 2016

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erg
XMM-Newton telescope
newton
nuclei
monitoring
nuclear radiation
active galactic nuclei
line of sight
luminosity
galaxies
material
radiation

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Marinucci, A., Bianchi, S., Matt, G., Alexander, D. M., Baloković, M., Bauer, F. E., ... 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
Marinucci, A. ; Bianchi, S. ; Matt, G. ; Alexander, D. M. ; Baloković, M. ; Bauer, F. E. ; Brandt, William Nielsen ; 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. / NuSTAR catches the unveiling nucleus of NGC 1068. In: Monthly Notices of the Royal Astronomical Society: Letters. 2016 ; Vol. 456, No. 1. pp. L94-L98.
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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

NuSTAR catches the unveiling nucleus of NGC 1068. / Marinucci, A.; Bianchi, S.; Matt, G.; Alexander, D. M.; Baloković, M.; Bauer, F. E.; Brandt, William Nielsen; 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.

In: Monthly Notices of the Royal Astronomical Society: Letters, Vol. 456, No. 1, 01.01.2016, p. L94-L98.

Research output: Contribution to journalArticle

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, William Nielsen

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 - 2016/1/1

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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 ≃ 10 25 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 × 10 43 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 ≃ 10 25 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 × 10 43 erg s -1 .

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JF - Monthly Notices of the Royal Astronomical Society: Letters

SN - 1745-3925

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Marinucci A, Bianchi S, Matt G, Alexander DM, Baloković M, Bauer FE et al. NuSTAR catches the unveiling nucleus of NGC 1068. Monthly Notices of the Royal Astronomical Society: Letters. 2016 Jan 1;456(1):L94-L98. https://doi.org/10.1093/mnrasl/slv178