How many radio-loud quasars can be detected by the gamma-ray large area space telescope?

	How many radio-loud quasars can be detected by the gamma-ray large area space telescope?
	Cao, Xinwu1 ; Bai, J. M.2
刊名	ASTROPHYSICAL JOURNAL LETTERS
	2008-02-01
卷号	673 期号:2 页码:L131-L134
关键词	accretion galaxies : active galaxies : jets radio continuum : galaxies accretion disks
英文摘要	In the unification scheme, radio quasars and FR II radio galaxies come from the same parent population, but viewed at different angles. Based on the Comptonization models for the gamma-ray emission from active galactic nuclei (AGNs), we estimate the number of radio quasars and FR II radio galaxies to be detected by the Gamma-Ray Large Area Space Telescope (GLAST) using the luminosity function (LF) of their parent population derived from the flat-spectrum radio quasar (FSRQ) LF. We find that similar to 1200 radio quasars will be detected by GLAST, if the soft seed photons for Comptonization come from the regions outside the jets. We also consider the synchrotron self-Comptonization (SSC) model, and find it unlikely to be responsible for gamma-ray emission from radio quasars. We find that no FR II radio galaxies will be detected by GLAST. Our results show that most radio AGNs to be detected by GLAST will be FSRQs (similar to 99% for the external Comptonization [EC] model), while the remainder (similar to 1%) will be steep-spectrum radio quasars (SSRQs). This implies that FSRQs will still be good candidates for identifying gamma-ray AGNs even for the GLAST sources. The contribution of all radio quasars and FR II radio galaxies to the extragalactic gamma-ray background (EGRB) is calculated, which accounts for similar to 30% of the EGRB.
学科主题	星系与宇宙学研究中心
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	ACTIVE GALACTIC NUCLEI ; LUMINOSITY FUNCTION ; BLAZARS ; RADIATION ; EMISSION ; JETS ; AGN ; EVOLUTION ; COMPTON ; GLAST
收录类别	SCI
语种	英语
WOS记录号	WOS:000255233000007
公开日期	2010-11-08
内容类型	期刊论文
源URL	[http://119.78.226.72//handle/331011/12459]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Yunnan, Peoples R China
推荐引用方式 GB/T 7714	Cao, Xinwu,Bai, J. M.. How many radio-loud quasars can be detected by the gamma-ray large area space telescope?[J]. ASTROPHYSICAL JOURNAL LETTERS,2008,673(2):L131-L134.
APA	Cao, Xinwu,&Bai, J. M..(2008).How many radio-loud quasars can be detected by the gamma-ray large area space telescope?.ASTROPHYSICAL JOURNAL LETTERS,673(2),L131-L134.
MLA	Cao, Xinwu,et al."How many radio-loud quasars can be detected by the gamma-ray large area space telescope?".ASTROPHYSICAL JOURNAL LETTERS 673.2(2008):L131-L134.