The characterization of the distant blazar GB6 J1239+0443 from flaring and low activity periods
- Pacciani L.
- Donnarumma I.
- Denney K. D.
- Assef R. J.
- Ikejiri Y.
- Yamanaka M.
- Uemura M.
- Domingo A.
- Giommi P.
- Tarchi A.
- Verrecchia F.
- Longo F.
- Raino S.
- Giusti M.
- Vercellone S.
- Chen A. W.
- Striani E.
- Vittorini V.
- Tavani M.
- Bulgarelli A.
- Giuliani A.
- Pucella G.
- Argan A.
- Barbiellini G.
- Caraveo P.
- Cattaneo P. W.
- Colafrancesco S.
- Costa E.
- De Paris G.
- Del Monte E.
- Di Cocco G.
- Evangelista Y.
- Ferrari A.
- Feroci M.
- Fiorini M.
- Fuschino F.
- Galli M.
- Gianotti F.
- Labanti C.
- Lapshov I.
- Lazzarotto F.
- Lipari P.
- Marisaldi M.
- Mereghetti S.
- Morelli E.
- Moretti E.
- Morselli A.
- Pellizzoni A.
- Perotti F.
- Piano G.
- Picozza P.
- Pilia M.
- Prest M.
- Rapisarda M.
- Rappoldi A.
- Rubini A.
- Sabatini S.
- Soffitta P.
- Trifoglio M.
- Trois A.
- Vallazza E.
- Zanello D.
- Pittori C.
- Santolamazza P.
- Lucarelli F.
- Salotti L.
- Valentini G.
DOIAbstract
In 2008, AGILE and Fermi detected gamma-ray flaring activity from the unidentified EGRET source 3EG J1236+0457, recently associated with a flat spectrum radio quasar (GB6 J1239+0443) at z = 1.762. The optical counterpart of the gamma-ray source underwent a flux enhancement of a factor of 1530 in six years, and of similar to 10 in six months. We interpret this flare-up in terms of a transition from an accretion-disc-dominated emission to a synchrotron-jet-dominated one. We analysed a Sloan Digital Sky Survey (SDSS) archival optical spectrum taken during a period of low radio and optical activity of the source. We estimated the mass of the central black hole using the width of the C?iv emission line. In our work, we have also investigated SDS...
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