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The NuSTAR view of the true type 2 Seyfert NGC 3147.
- Source :
-
Monthly Notices of the Royal Astronomical Society . Jul2017, Vol. 468 Issue 3, p2740-2744. 5p. - Publication Year :
- 2017
-
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. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ACTIVE galaxies
*GALAXY spectra
*DATA analysis
*X-ray astronomy
*COMPTON scattering
Subjects
Details
- Language :
- English
- ISSN :
- 00358711
- Volume :
- 468
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Publication Type :
- Academic Journal
- Accession number :
- 123472088
- Full Text :
- https://doi.org/10.1093/mnras/stx662