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COMPTEL observations of the gamma-ray blazars 3C 454.3 and CTA 102 during the CGRO mission
Zhang S(张澍); Zhang, S; Collmar, W; Schonfelder, V
2005
发表期刊ASTRONOMY & ASTROPHYSICS
卷号444期号:3页码:767-775
通讯作者Inst High Energy Phys, Lab Particle Astrophys, Beijing 100049, Peoples R China ; Max Planck Inst Extraterr Phys, D-85741 Garching, Germany
摘要We have investigated the MeV behaviour of the gamma-ray blazars 3C 454.3 and CTA 102 by analyzing all COMPTEL observations of this sky region during the complete CGRO mission. Both sources are detected by COMPTEL at the upper COMPTEL energies, although their flux estimates may be uncertain by possible minor contributions of nearby unidentified EGRET gamma-ray sources. While CTA 102 was only detected at energies above 10 MeV during the early mission, 3C 454.3 is most significantly detected in the COMPTEL 3- 10 MeV band in the sum of all data. Time-resolved analyses indicate a weak (near COMPTEL threshold) but likely steady 3- 10 MeV emission over years, being independent of the observed time variability at energies above 100 MeV as observed by EGRET. This energy-dependent variability behaviour suggests different emission mechanisms at work in the two bands. Putting the COMPTEL fluxes in multifrequency perspective (radio to gamma-rays) reveals for both sources the typical two-hump blazar spectrum, with a low-energy maximum around the IR and a high-energy maximum at MeV energies. The latter one dominates the energy output across the whole electro-magnetic spectrum. The results of our analyses are discussed in the framework of current blazar modeling.
文章类型Article
关键词gamma rays : observations galaxies : active galaxies : quasars : individual : 3C 454.3, CTA 102
学科领域Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
DOI10.1051/0004-6361:20053592
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语种英语
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000233773200011
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被引频次:11[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/238451
专题粒子天体物理中心
作者单位中国科学院高能物理研究所
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Zhang S,Zhang, S,Collmar, W,et al. COMPTEL observations of the gamma-ray blazars 3C 454.3 and CTA 102 during the CGRO mission[J]. ASTRONOMY & ASTROPHYSICS,2005,444(3):767-775.
APA 张澍,Zhang, S,Collmar, W,&Schonfelder, V.(2005).COMPTEL observations of the gamma-ray blazars 3C 454.3 and CTA 102 during the CGRO mission.ASTRONOMY & ASTROPHYSICS,444(3),767-775.
MLA 张澍,et al."COMPTEL observations of the gamma-ray blazars 3C 454.3 and CTA 102 during the CGRO mission".ASTRONOMY & ASTROPHYSICS 444.3(2005):767-775.
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