2012MNRAS.425.2015P

Query : 2012MNRAS.425.2015P

2012MNRAS.425.2015P - Mon. Not. R. Astron. Soc., 425, 2015-2026 (2012/September-3)

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. and VALENTINI G.

Abstract (from CDS):

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 15–30 in six years, and of ∼ 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 CIV emission line. In our work, we have also investigated SDSS archival optical photometric data and ultraviolet GALEX observations to estimate the thermal disc emission contribution of GB6 J1239+0443. Our analysis of the gamma-ray data taken during the flaring episodes indicates a flat gamma-ray spectrum, with an extension of up to 15GeV, with no statistically relevant sign of absorption from the broad-line region, suggesting that the blazar zone is located beyond the broad-line region. This result is confirmed by the modelling of the broad-band spectral energy distribution (well constrained by the available multiwavelength data) of the flaring activity periods and by the accretion disc luminosity and black hole mass estimated by us using archival data.

Marie Curie Fellow.

NASA Postdoctoral Program Fellow.


Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society 2012 RAS

Journal keyword(s): radiation mechanisms: non-thermal - galaxies: active - galaxies: individual: GB6 J1239+0443 - quasars: general

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 PG 0851+202 BLL 08 54 48.8749846272 +20 06 30.639583620   15.649 15.146 15.446   ~ 2513 1
2 4C 04.42 Bla 12 22 22.54962606 +04 13 15.7760715   17.88 17.98 17.06   ~ 354 1
3 7C 122223.5+213929 Bla 12 24 54.4583146056 +21 22 46.385507388   17.56 17.50 18.2   ~ 770 2
4 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 6022 1
5 NAME Virgo Region reg 12 30.8 +12 23           ~ 140 1
6 [VV2006] J123932.7+044305 Bla 12 39 32.75568115 +04 43 05.2330218   20.81 20.56 18.1   ~ 191 2
7 [VV2006] J123936.5+044249 QSO 12 39 36.5245647432 +04 42 49.300125228   19.11 18.81     ~ 25 0
8 [VV2006] J123945.1+044431 QSO 12 39 45.0712321776 +04 44 31.418540844   18.89 18.44     ~ 23 0
9 3C 279 Bla 12 56 11.16657958 -05 47 21.5251510   18.01 17.75 15.87   ~ 3205 2
10 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
11 QSO J1512-0906 Bla 15 12 50.53293048 -09 05 59.8297908   16.74 16.54     ~ 1409 1
12 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 3004 2

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