COMPTEL observations of the gamma-ray blazars 3C 454.3 and CTA 102 during the CGRO mission

CORC > 高能物理研究所 > 中国科学院高能物理研究所 > 粒子天体物理中心

	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
刊名	ASTRONOMY & ASTROPHYSICS
	2005
卷号	444 期号:3 页码:767-775
关键词	gamma rays : observations galaxies : active galaxies : quasars : individual : 3C 454.3, CTA 102
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
英文摘要	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.
学科主题	Astronomy & Astrophysics
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
原文出处	SCI
语种	英语
WOS记录号	WOS:000233773200011
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/238451]
专题	高能物理研究所_粒子天体物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	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.