5 papers · 1 filter
Unveiling the nature of INTEGRAL objects through optical spectroscopy. VII. Identification of 20 Galactic and extragalactic hard X-ray sources
N. Masetti, P. Parisi, E. Palazzi +17
Within the framework of our program of assessment of the nature of unidentified or poorly known INTEGRAL sources, we present here spectroscopy of optical objects, selected through…
Jet-BLR connection in the radio galaxy 3C 390.3
T. G. Arshakian, J. Leon-Tavares, A. P. Lobanov +5
Variations of the optical continuum emission in the radio galaxy 3C 390.3 are compared to the properties of radio emission from the compact, sub-parsec-scale jet in this object. We…
Long-term variability of the optical spectra of NGC 4151: I. Light curves and flux correlations
A. I. Shapovalova, L. C. Popovic, S. Collin +13
Results of a long-term spectral monitoring of the active galactic nucleus of NGC 4151 are presented (11 years, from 1996 to 2006). High quality spectra (S/N>50 in the continuum nea…
Radio-Optical Study of Double-Peaked AGNs. I. 3C 390.3
J. Leon-Tavares, A. P. Lobanov, V. H. Chavushyan +1
We aim to test the model proposed to explain the correlation between the flux density at 15 GHz of a stationary component in the parsec-scale jet and the optical continuum emission…
Searching evidences for spiral shocks in the quiescent accretion disk of U Gem
V. V. Neustroev, V. Chavushyan, J. R. Valdes
We find that the quiescent accretion disk of U Gem has a complicated structure. Along to the bright spot originating in the region of interaction between the stream and the disk pa…