2011A&A...532A.150S


Query : 2011A&A...532A.150S

2011A&A...532A.150S - Astronomy and Astrophysics, volume 532A, 150-150 (2011/8-1)

Identification of γ-ray emission from 3C 345 and NRAO 512.

SCHINZEL F.K., SOKOLOVSKY K.V., D'AMMANDO F., BURNETT T.H., MAX-MOERBECK W., CHEUNG C.C., FEGAN S.J., CASANDJIAN J.M., REYES L.C., VILLATA M., RAITERI C.M., AGUDO I., BRAVO CALLE O.J.A., CAROSATI D., CASAS R., GOMEZ J.L., GURWELL M.A., HSIAO H.Y., JORSTAD S.G., KIMERIDZE G., KONSTANTINOVA T.S., KOPATSKAYA E.N., KOPTELOVA E., KURTANIDZE O.M., KURTANIDZE S.O., LARIONOV V.M., LARIONOVA E.G., LARIONOVA L.V., MARSCHER A.P., MOROZOVA D.A., NIKOLASHVILI M.G., ROCA-SOGORB M., ROS J.A., SIGUA L.A., SPIRIDONOVA O., TROITSKY I.S., VLASYUK V.V., LOBANOV A.P. and ZENSUS J.A.

Abstract (from CDS):

For more than 15 years, since the days of the Energetic Gamma-Ray Experiment Telescope (EGRET) on board the Compton Gamma-Ray Observatory (CGRO; 1991-2000), it has remained an open question why the prominent blazar 3C345 was not reliably detected at γ-ray energies ≥20MeV. Recently a bright γ-ray source (0FGLJ1641.4+3939/1FGLJ1642.5+3947), potentially associated with 3C345, was detected by the Large Area Telescope (LAT) on Fermi. Multiwavelength observations from radio bands to X-rays (mainly GASP-WEBT and Swift) of possible counterparts (3C345, NRAO512, B3 1640+396) were combined with 20 months of Fermi-LAT monitoring data (August 2008-April 2010) to associate and identify the dominating γ-ray emitting counterpart of 1FGLJ1642.5+3947. The source 3C345 is identified as the main contributor for this γ-ray emitting region. However, after November 2009 (15 months), a significant excess of photons from the nearby quasar NRAO512 started to contribute and thereafter was detected with increasing γ-ray activity, possibly adding flux to 1FGLJ1642.5+3947. For the same time period and during the summer of 2010, an increase of radio, optical and X-ray activity of NRAO512 was observed. No γ-ray emission from B3 1640+396 was detected.

Abstract Copyright:

Journal keyword(s): galaxies: active - quasars: individual: 3C345 - gamma rays: galaxies - quasars: individual: NRAO512 - quasars: individual: B3 1640+396

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 QSO B0235+1624 BLL 02 38 38.9300958576 +16 36 59.276150136   16.46 15.50 15.92   ~ 1466 2
2 QSO J0854+2006 BLL 08 54 48.8749846272 +20 06 30.639583620   15.91 15.43 15.56   ~ 2207 1
3 3C 279 Bla 12 56 11.1663795384 -05 47 21.528432492   18.01 17.75 15.87   ~ 2907 2
4 4C 38.41 QSO 16 35 15.4928147784 +38 08 04.499799360   18.14 17.97 17.25   ~ 812 1
5 6C 163852+395305 QSO 16 40 29.6332404024 +39 46 46.030865700   18.4 16.5 18.75   ~ 291 2
6 QSO B1640+396 QSO 16 41 47.5389998880 +39 35 03.321075804   20.01 19.83     ~ 63 1
7 3C 345 QSO 16 42 58.8102993888 +39 48 37.002763188   16.81 16.59 16.84   ~ 1646 2
8 4C 39.49 BLL 16 53 52.2160772976 +39 45 36.613228860 14.09 14.15 13.29 8.26   ~ 2049 2
9 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 2717 2

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2022.11.28-13:09:02

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