KVN observations reveal multiple γ-ray emission regions in 3C 84?

COMPTEL observations of the γ-ray blazars 3C 454.3 and CTA 102 during the CGRO mission

We have investigated the MeV behaviour of the γ-ray blazars 3C 454.3 and CTA 102 by analyzing all COMPTEL observations of this sky region during the complete CGRO mission. Both sources are detected by COMPTEL at the upper COMPTEL energies, although their flux estimates may be uncertain by possible minor contributions of nearby unidentified EGRET γ-ray sources. While CTA 102 was only detected at...

Veritas Observations of a Very High Energy Γ -ray Flare from the Blazar 3c 66a

The intermediate-frequency peaked BL Lacertae (IBL) object 3C 66A is detected during 2007–2008 in VHE (very high energy; E > 100 GeV) γ rays with the VERITAS stereoscopic array of imaging atmospheric Cherenkov telescopes. An excess of 1791 events is detected, corresponding to a significance of 21.2 standard deviations (σ ), in these observations (32.8 hr live time). The observed integral flux a...

Microquasars: hard X-ray/γ-ray emission

I review some of the basic observational details of jets from X-ray binaries, or ‘microquasars’. It is shown that in both (Z and Atoll) NS and BHC systems radio emission, and therefore jet formation, is correlated with the presence of hard (30–500 keV) X-ray emission. At γ-ray (> 500 keV) energies, the relation is not so clear. Possible physical connections between the presence of a jet, with a...

de Barcelona γ - ray emission from regions of star formation : Theory and observations with the MAGIC Telescope

X-ray Emission from the Radio Jet in 3c 120

We report the discovery of X-ray emission from a radio knot at a projected distance of 25′′ from the nucleus of the Seyfert galaxy, 3C 120. The data were obtained with the ROSAT High Resolution Imager (HRI). Optical upper limits for the knot preclude a simple power law extension of the radio spectrum and we calculate some of the physical parameters for thermal bremsstrahlung and synchrotron sel...