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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29516
Title: The NuSTAR view of the true type 2 Seyfert NGC 3147
Authors: BIANCHI, STEFANO
Marinucci, Andrea
Matt, Giorgio
MIDDEI, RICCARDO
Barcons, Xavier
BASSANI, LOREDANA
Carrera, Francisco J.
LA FRANCA, FABIO
PANESSA, Francesca 
Issue Date: 2017
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 468
Issue: 3
First Page: 2740
Abstract: 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.
URI: http://hdl.handle.net/20.500.12386/29516
URL: https://academic.oup.com/mnras/article/468/3/2740/3072852
ISSN: 0035-8711
DOI: 10.1093/mnras/stx662
Bibcode ADS: 2017MNRAS.468.2740B
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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