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High redshift Fermi blazars observed by GROND and Swift
G. Ghisellini, M. Nardini, G. Tagliaferri +7
We observed 5 gamma-ray loud blazars at redshift greater than 2 with the X-Ray Telescope (XRT) and the UltraViolet and Optical Telescope (UVOT) onboard the Swift satellite, and the…
SDSS J102623.61+254259.5: the second most distant blazar at z=5.3
T. Sbarrato, G. Ghisellini, M. Nardini +7
The radio-loud quasar SDSS J102623.61+254259.5, at a redshift z=5.3, is one of the most distant radio-loud objects. Since its radio flux exceeds 100 mJy at a few GHz, it is also on…
Blue Fermi Flat Spectrum Radio Quasars
G. Ghisellini, F. Tavecchio, L. Foschini +3
Many blazars detected by the Fermi satellite, observed spectroscopically in the optical, are line-less, and have been classified as BL Lac objects. Optical-UV photometry of nearly…
The WISE view of the disc-torus connection in z~0.6 Active Galactic Nuclei
Giorgio Calderone, Tullia Sbarrato, Gabriele Ghisellini
We selected all radio-quiet AGN in the latest release of Sloan digital sky survey quasar catalog, with redshift in the range 0.56-0.73. About 4000 (~80%) of these have been detecte…