Gamma-ray emission in GPS quasars

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	Gamma-ray emission in GPS quasars
	Bai JM(白金明)
	2005
会议名称	5th Micorquasar Workshop
会议日期	2004-06-07
会议地点	Beijing, PEOPLES R CHINA
关键词	galaxies : active galaxies : jets quasars : general radiation mechanism : nonthermal gamma-rays : theory X-rays : galaxies
卷号	5
页码	207-212
通讯作者	Bai, JM (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Astron Observ, Kunming 650011, Peoples R China.
英文摘要	In this paper, it is argued that the relativistic jets in gigahertz peaked spectrum (GPS) quasars are oriented at small angle to the line of sight and are powerful gamma-ray sources. Besides luminous hard gamma-ray emission, most of them may have significant soft gamma-ray and X-ray emission due to infrared photons from very dense and dusty nuclear interstellar media in GPS quasars, which is consistent with ASCA X-ray observations. Because Compton cooling in GPS quasars is stronger than in flat spectrum radio quasars (FSRQs), synchrotron emission in GPS quasars may less dominate over thermal emission of the accretion disk and hot dust than in FSRQs, hence most GPS quasars show low optical polarization and small variability. We suggest that it is the significant radio emission of electron/positron pairs produced by the interaction of gamma-rays with the dense gas and dust grains in GPS quasars that makes GPS quasars show steep radio spectra, low radio polarization, and relatively faint VLBI/VLBA cores. The gamma-ray emission in GPS quasars can be tested by the observation of the INTEGRAL and GLAST in the near future.
收录类别	SCI ; CPCI
产权排序	第一完成单位
会议主办者	Tsinghua Univ
会议网址	http://iopscience.iop.org/1009-9271/5/S1/207/
会议录	CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
会议录出版者	SCIENCE PRESS
会议录出版地	16 DONGHUANGCHENGGEN NORTH ST, BEIJING 100717, PEOPLES R CHINA
学科主题	Astronomy & Astrophysics
语种	英语
ISSN号	1009-9271
WOS记录号	WOS:000234137100033
研究领域[WOS]	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
内容类型	会议论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/307]
专题	云南天文台_丽江天文观测站（南方基地）
作者单位	Yunnan Astronomical Observatory, National Astronomical Observatories, Chinese Academy of Sciences, Kunming, Yunnan 650011
推荐引用方式 GB/T 7714	Bai JM. Gamma-ray emission in GPS quasars[C]. 见:5th Micorquasar Workshop. Beijing, PEOPLES R CHINA. 2004-06-07.http://iopscience.iop.org/1009-9271/5/S1/207/.