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The NuSTAR view of the true type 2 Seyfert NGC 3147

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 ? ~ 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]?5007 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.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: Monthly Notices of the Royal Astronomical Society, Vol. 468, Iss. 3, Pps 2740-2744 (2017)

Editorial: Oxford University Press

 Fecha de publicación: 01/03/2017

Nº de páginas: 5

Tipo de publicación: Artículo de Revista

 DOI: 10.1093/mnras/stx662

ISSN: 0035-8711,1365-2966

Proyecto español: AYA2015-64346-C2-1-P

Url de la publicación: https://doi.org/10.1093/mnras/stx662