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One more surprise from the Circinus Galaxy: BeppoSAX discovery of a transmission component in hard X-rays
G. Matt, M. Guainazzi, R. Maiolino +11
The Circinus Galaxy has been observed, for the first time above 10 keV, by BeppoSAX. An excess emission above the extrapolation of the best fit 0.1--10 keV spectrum is apparent in…
A 3 dimensional diagnostic diagram for Seyfert 2s: probing X-ray absorption and Compton thickness
L. Bassani, M. Dadina, R. Maiolino +5
We present and discuss a "3-dimensional" diagnostic diagram for Seyfert2 galaxies obtained by means of X-ray and [OIII] data on a large sample of objects (reported in the Appendix)…
The swan song: the disappearance of the nucleus of NGC 4051 and the echo of its past glory
M. Guainazzi, F. Nicastro, F. Fiore +10
BeppoSAX observed the low-luminous Seyfert 1 Galaxy NGC4051 in a ultra-dim X-ray state. The 2-10 keV flux (1.26 x 10^{-12} erg/cm^2/s) was about 20 times fainter than its historica…
The X-ray spectrum and variability of the Seyfert 2 Galaxy NGC7172
M. Guainazzi, G. Matt, L. A. Antonelli +3
We present evidence of flux variability, on both short (hours) and long (months) time scales of the Seyfert 2 galaxy NGC 7172. These results are based on the ASCA observation of NG…