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NGC 3147: A 'true' type 2 Seyfert galaxy without the broad-line region

AuthorsBianchi, Stefano; Panessa, Francesca ; Barcons, Xavier ; Matt, Giorgio; Bassani, Loredana; Carrera, Francisco J. ; Jiménez-Bailón, E.
KeywordsGalaxies: Seyfert
X-rays: individual: NGC 3147
Galaxies: active
Issue Date2008
PublisherRoyal Astronomical Society
Oxford University Press
CitationMonthly Notices of the Royal Astronomical Society 385(1): 195-199 (2008)
AbstractWe report on simultaneous optical and X-ray observations of the Seyfert galaxy, NGC 3147. The XMM-Newton spectrum shows that the source is unabsorbed in the X-rays (NH < 5 × 1020 cm-2). On the other hand, no broad lines are present in the optical spectrum. The origin of this optical/X-rays misclassification (with respect to the Unification Model) cannot be attributed to variability, since the observations in the two bands are simultaneous. Moreover, a Compton-thick nature of the object can be rejected on the basis of the low-equivalent width of the iron Kα line (≃130 eV) and the large ratio between the 2-10 keV and the [O iii] fluxes. It seems therefore inescapable to conclude that NGC 3147 intrinsically lacks the Broad-Line Region, making it the first 'true' type 2 Seyfert galaxy.
Publisher version (URL)https://doi.org/10.1111/j.1365-2966.2007.12625.x
Identifiersdoi: 10.1111/j.1365-2966.2007.12625.x
issn: 0035-8711
e-issn: 1365-2966
Appears in Collections:(IFCA) Artículos
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