In recent years the number of known sources emitting in the TeV-PeV regime has increased significantly thanks to facilities like LHAASO and HAWC. The more natural candidates, for energetic and ambient properties, are pulsars and their environment.
However, due to the limited angular resolution of the current instruments, many of the observed sources have more than one lower-energy...
Born in 1997 to provide an optical follow-up of gamma-loud blazars observed by the Compton Gamma Ray Observatory, the Whole Earth Blazar Telescope (WEBT) is a large collaboration including several tens of astronomers around the northern hemisphere who monitor blazars mainly in the optical (including polarimetry), but also in the radio and near-infrared bands. Since 2000 the Collaboration has...
In recent years the number of known sources emitting in the TeV-PeV regime has increased significantly thanks to facilities like LHAASO and HAWC. The more natural candidates, for energetic and ambient properties, are pulsars and their environment.
However, due to the limited angular resolution of the current instruments, many of the observed sources have more than one lower-energy...
Despite the long held assumption that PWNe at high energy could be counted as "stable candles", detection of gamma-ray flares in the Crab nebula, led us to revisit our ideas about the working of such systems. Given the lack of resolution of current gamma-ray observations, analysis of variability was performed at other wavelengths in search for possible counterparts that could guide us to the...
TeV emitters are typically multi-wavelength sources, generally highly variable and occasionally highly polarized. This makes it critical to line up ground-based dedicated facilities for identification, follow-up and monitoring of CTA targets in polarized and total radio-to-optical light. Furthermore, the CTA itself provides suitable infrastructure for the implementation of specific observing...
