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Probing the circumnuclear absorbing medium of the buried AGN in NGC 1068 through NuSTAR observations

Probing the circumnuclear absorbing medium of the buried AGN in NGC 1068 through NuSTAR observations
Probing the circumnuclear absorbing medium of the buried AGN in NGC 1068 through NuSTAR observations
We present the results of the latest NuSTAR monitoring campaign of the Compton-thick Seyfert 2 galaxy NGC 1068, composed of four ∼50 ks observations performed between 2017 July and 2018 February to search for flux and spectral variability on time-scales from 1 to 6 months. We detect one unveiling and one eclipsing event with time-scales less than 27 and 91 d, respectively, ascribed to Compton-thick material with NH = (1.8 ± 0.8) × 1024 and ≥ (2.4 ± 0.5) × 1024 cm−2 moving across our line of sight. This gas is likely located in the innermost part of the torus or even further inward, thus providing further evidence of the clumpy structure of the circumnuclear matter in this source. Taking advantage of simultaneous Swift–XRT observations, we also detected a new flaring ULX, at a distance d ∼ 30 arcsec (i.e. ∼2 kpc) from the nuclear region of NGC 1068, with a peak X-ray intrinsic luminosity of (3.0 ± 0.4) × 1040 erg s−1 in the 2–10 keV band.
0035-8711
Zaino, A.
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Bianchi, S.
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Marinucci, A.
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Matt, G.
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Bauer, F.E.
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Brandt, W.N.
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Gandhi, Poshak
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Guainazzi, M.
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Iwasawa, K.
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Puccetti, S.
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Ricci, C.
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Walton, D.J.
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Zaino, A.
c0dfe2dd-0180-45bc-b5df-f12dafbaa45b
Bianchi, S.
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Marinucci, A.
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Matt, G.
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Bauer, F.E.
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Brandt, W.N.
833e017c-17a6-4351-abd6-c886e7137c2d
Gandhi, Poshak
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Guainazzi, M.
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Iwasawa, K.
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Puccetti, S.
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Ricci, C.
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Walton, D.J.
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Zaino, A., Bianchi, S., Marinucci, A., Matt, G., Bauer, F.E., Brandt, W.N., Gandhi, Poshak, Guainazzi, M., Iwasawa, K., Puccetti, S., Ricci, C. and Walton, D.J. (2020) Probing the circumnuclear absorbing medium of the buried AGN in NGC 1068 through NuSTAR observations. Monthly Notices of the Royal Astronomical Society. (doi:10.1093/mnras/staa107).

Record type: Article

Abstract

We present the results of the latest NuSTAR monitoring campaign of the Compton-thick Seyfert 2 galaxy NGC 1068, composed of four ∼50 ks observations performed between 2017 July and 2018 February to search for flux and spectral variability on time-scales from 1 to 6 months. We detect one unveiling and one eclipsing event with time-scales less than 27 and 91 d, respectively, ascribed to Compton-thick material with NH = (1.8 ± 0.8) × 1024 and ≥ (2.4 ± 0.5) × 1024 cm−2 moving across our line of sight. This gas is likely located in the innermost part of the torus or even further inward, thus providing further evidence of the clumpy structure of the circumnuclear matter in this source. Taking advantage of simultaneous Swift–XRT observations, we also detected a new flaring ULX, at a distance d ∼ 30 arcsec (i.e. ∼2 kpc) from the nuclear region of NGC 1068, with a peak X-ray intrinsic luminosity of (3.0 ± 0.4) × 1040 erg s−1 in the 2–10 keV band.

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Probing the circumnuclear absorbing medium of the buried AGN in NGC 1068 through NuSTAR observations - Accepted Manuscript
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Accepted/In Press date: 10 January 2020
e-pub ahead of print date: 15 January 2020
Additional Information: arXiv is AM

Identifiers

Local EPrints ID: 439446
URI: http://eprints.soton.ac.uk/id/eprint/439446
ISSN: 0035-8711
PURE UUID: 57ded780-aa75-4417-a7c0-e293eb76813f
ORCID for Poshak Gandhi: ORCID iD orcid.org/0000-0003-3105-2615

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Date deposited: 23 Apr 2020 16:33
Last modified: 07 Oct 2020 02:06

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Contributors

Author: A. Zaino
Author: S. Bianchi
Author: A. Marinucci
Author: G. Matt
Author: F.E. Bauer
Author: W.N. Brandt
Author: Poshak Gandhi ORCID iD
Author: M. Guainazzi
Author: K. Iwasawa
Author: S. Puccetti
Author: C. Ricci
Author: D.J. Walton

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