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The NuSTAR view of the true type 2 Seyfert NGC 3147

AuthorsBianchi, Stefano; Marinucci, Andrea; Matt, Giorgio; Middei, Riccardo; Barcons, Xavier ; Bassani, Loredana; Carrera, Francisco J. ; La Franca, Fabio; Panessa, Francesca
KeywordsX-rays: individual: NGC 3147
Galaxies: Seyfert
Galaxies: active
Issue Date2017
PublisherRoyal Astronomical Society
Oxford University Press
CitationMonthly Notices of the Royal Astronomical Society 468(3): 2740-2744 (2017)
AbstractWe 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 [OIII ]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.
Publisher version (URL)https://doi.org/10.1093/mnras/stx662
Identifiersdoi: 10.1093/mnras/stx662
e-issn: 1365-2966
issn: 0035-8711
Appears in Collections:(IFCA) Artículos
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