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The NuSTAR view of the true Type 2 Seyfert NGC 3147

Bianchi, Stefano and Marinucci, Andrea and Matt, Giorgio and Middei, Riccardo and Barcons, Xavier and Bassani, Loredana and Carrera, Francisco J. and La Franca, Fabio and Panessa, Francesca (2017) The NuSTAR view of the true Type 2 Seyfert NGC 3147. Monthly Notices of the Royal Astronomical Society, 468 (3). pp. 2740-2744. ISSN 0035-8711. doi:10.1093/mnras/stx662.

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We present the first NuSTAR observation of a ‘true’ type 2 Seyfert galaxy. The 3–40 keV X-ray spectrum of NGC 3147 is characterized by a simple power-law, with a standard Γ ∼ 1.7 and an iron emission line, with no need for any further component up to ∼40 keV. These spectral properties, together with significant variability on time-scales as short as weeks (as shown in a 2014 Swift monitoring campaign), strongly support an unobscured line of sight for this source. An alternative scenario in terms of a Compton-thick source is strongly disfavoured, requiring an exceptional geometrical configuration, whereas a large fraction of the solid angle to the source is filled by a highly ionized gas, whose reprocessed emission would dominate the observed luminosity. Moreover, in this scenario, the implied intrinsic X-ray luminosity of the source would be much larger than the value predicted by other luminosity proxies, like the [O III]λ5007 emission-line extinction-corrected luminosity. Therefore, we confirm with high confidence that NGC 3147 is a true type 2 Seyfert galaxy, intrinsically characterized by the absence of a broad-line region.

Item Type:Article
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URLURL TypeDescription Paper
Bianchi, Stefano0000-0002-4622-4240
Matt, Giorgio0000-0002-2152-0916
Middei, Riccardo0000-0001-9815-9092
Additional Information:© 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2017 March 14. Received 2017 March 13; in original form 2017 January 27. Published: 16 March 2017. We would like to thank Kristin Kruse Madsen for her help in interpreting the discrepancy at the iron line energy between the two NuSTAR modules. SB acknowledges financial support from the Italian Space Agency under grant ASI-INAF I/037/12/0. AM and GM acknowledge financial support from the Italian Space Agency under grant ASI/INAF I/037/12/0-011/13. AM acknowledges financial support from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement no. 312789. FP acknowledges the ASI/INAF agreement number 2013-023-R1. XB and FJC acknowledge financial support through grant AYA2015-64346-C2-1-P (MINECO/FEDER).
Subject Keywords:galaxies: active – galaxies: Seyfert –X-rays: individual: NGC 3147
Issue or Number:3
Record Number:CaltechAUTHORS:20170320-101557112
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Official Citation:Stefano Bianchi, Andrea Marinucci, Giorgio Matt, Riccardo Middei, Xavier Barcons, Loredana Bassani, Francisco J. Carrera, Fabio La Franca, Francesca Panessa; The NuSTAR view of the true type 2 Seyfert NGC 3147, Monthly Notices of the Royal Astronomical Society, Volume 468, Issue 3, 1 July 2017, Pages 2740–2744,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75236
Deposited By: Joy Painter
Deposited On:20 Mar 2017 17:22
Last Modified:15 Nov 2021 16:31

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