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The Activity of the Neighbours of Seyfert Galaxies
E. Koulouridis, M. Plionis, V. Chavushyan +4
We present a follow-up study on a series of papers concerning the role of close interactions as a possible triggering mechanism of AGN activity. We have already studied the close (…
The connection between the gamma-ray emission and millimeter flares in Fermi/LAT blazars
J. Leon-Tavares, E. Valtaoja, M. Tornikoski +2
We compare the gamma-ray photon flux variability of northern blazars in the Fermi/LAT First Source Catalog with 37 GHz radio flux density curves from the Metsahovi quasar monitorin…
Simultaneous Planck, Swift, and Fermi observations of X-ray and gamma-ray selected blazars
P. Giommi, G. Polenta, A. Lahteenmaki +92
We present simultaneous Planck, Swift, Fermi, and ground-based data for 105 blazars belonging to three samples with flux limits in the soft X-ray, hard X-ray, and gamma-ray bands.…
Radio-Optical-Gamma-Ray properties of MOJAVE AGN detected by Fermi/LAT
T. G. Arshakian, J. León-Tavares, M. Boettcher +5
Aims. We use a sample of 83 core-dominated active galactic nuclei (AGN) selected from the MOJAVE (Monitoring of Jets in AGN with VLBA Experiments) radio-flux-limited sample and det…
The connection between gamma-ray emission and millimeter flares in Fermi/LAT blazars
J. Leon-Tavares, E. Valtaoja, M. Tornikoski +2
We compare the gamma-ray photon flux variability of northern blazars in the Fermi/LAT First Source Catalog with 37 GHz radio flux density curves from the Metsahovi quasar monitorin…
Spectral optical monitoring of 3C 390.3 in 1995-2007: II. Variability of the spectral line parameters
L. C. Popovic, A. I. Shapovalova, D. Ilic +6
A study of the variability of the broad emission-line parameters of 3C390.3, an active galaxy with the double-peaked emission-line profiles, is presented. We give a detail analysis…