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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/50874

    Title: Identification of gamma-ray emission from 3C 345 and NRAO 512
    Authors: Schinzel,FK;Sokolovsky,KV;Ammando,F;Burnett,TH;Max-Moerbeck,W;Cheung,CC;Fegan,SJ;Casandjian,JM;Reyes,LC;Villata,M;Raiteri,CM;Agudo,I;Calle,OJAB;Carosati,D;Casas,R;Gomez,JL;Gurwell,MA;Hsiao,HY;Jorstad,SG;Kimeridze,G;Konstantinova,TS;Kopatskaya,EN;Koptelova,E;Kurtanidze,OM;Kurtanidze,SO;Larionov,VM;Larionova,EG;Larionova,LV;Marscher,AP;Morozova,DA;Nikolashvili,MG;Roca-Sogorb,M;Ros,JA;Sigua,LA;Spiridonova,O;Troitsky,IS;Vlasyuk,VV;Lobanov,AP;Zensus,JA
    Contributors: 天文研究所
    Date: 2011
    Issue Date: 2012-03-27 18:11:53 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 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 3C 345 was not reliably detected at gamma-ray energies >= 20 MeV. Recently a bright gamma-ray source (0FGL J1641.4+3939/1FGL J1642.5+3947), potentially associated with 3C 345, 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 (3C 345, NRAO512, B3 1640+396) were combined with 20 months of Fermi-LAT monitoring data (August 2008-April 2010) to associate and identify the dominating gamma-ray emitting counterpart of 1FGL J1642.5+3947. The source 3C 345 is identified as the main contributor for this gamma-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 gamma-ray activity, possibly adding flux to 1FGL J1642.5+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 gamma-ray emission from B3 1640+396 was detected.
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