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

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

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agn8.confe..10b&link_type=abstract

Proceedings of the 8th National Conference on AGN, held in Torino, Italy, May 19-22, 2008. Edited by L. Lanteri, C.M. Raiteri,

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Scientific paper

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 10^20 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 ( ~eq 130 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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