NGC3147: a "true" Seyfert 2 without the broad-line region

Details NGC3147: a "true" Seyfert 2 without the broad-line region NGC3147: a "true" Seyfert 2 without the broad-line region

2007-10-23

arxiv.org/abs/0710.4226v1

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figures, accepted for publication in MNRAS Letters

Scientific paper

10.1111/j.1365-2966.2007.12625.x

We report on simultaneous optical and X-ray observations of the Seyfert galaxy, NGC3147. The XMM-Newton spectrum shows that the source is unabsorbed in the X-rays ($N_H<5\times10^{20}$ 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 K$\alpha$ line ($\simeq130$ eV) and the large ratio between the 2-10 keV and the [OIII] fluxes. It seems therefore inescapable to conclude that NGC3147 intrinsically lacks the Broad Line Region (BLR), making it the first "true" Seyfert 2.

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