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An optical view of extragalactic gamma-ray emitters
Simona Paiano, Renato Falomo, Marco Landoni +2
The Fermi Gamma-ray Observatory discovered about a thousand extragalactic sources emitting energy from 100 MeV to 100 GeV. The majority of these sources belong to the class of blaz…
On the lensed blazar B0218+357
R. Falomo, A. Treves, R. Scarpa +2
We present an optical spectrum (4000-10500 Å ) of the lensed blazar B0218+357 secured at the 10m GTC and aimed to investigate and clarify the properties of this intriguing system.…
Spectroscopy of 10 gamma-ray BL Lac objects at high redshift
Simona Paiano, Marco Landoni, Renato Falomo +2
We present high S/N optical spectra of 10 BL Lac objects detected at GeV energies by Fermi satellite (3FGL catalog), for which previous observations suggested that they are at rela…
On the redshift of TeV BL Lac objects
Simona Paiano, Marco Landoni, Renato Falomo +3
We report results of a spectroscopic campaign carried out at the 10 m Gran Telescopio Canarias for a sample of 22 BL Lac objects detected (or candidates) at TeV energies, aimed to…