The VSOP 5 GHz active galactic nucleus survey. IV. The angular size/brightness temperature distribution

	The VSOP 5 GHz active galactic nucleus survey. IV. The angular size/brightness temperature distribution
	Horiuchi, S ; Fomalont, EB ; Scott, WK ; Taylor, AR ; Lovell, JEJ ; Moellenbrock, GA ; Dodson, R ; Murata, Y ; Hirabayashi, H ; Edwards, PG
刊名	ASTROPHYSICAL JOURNAL
	2004-11-20
卷号	616 期号:1 页码:110-122
关键词	galaxies : active radio continuum : galaxies surveys techniques : interferometric
英文摘要	The VLBI Space Observatory Programme (VSOP) mission is a Japanese-led project to study radio sources with submilliarcsecond angular resolution, using an orbiting 8 m telescope on board the satellite HALCA with a global Earth-based array of telescopes. A major program is the 5 GHz VSOP Survey Program, which we supplement here with Very Long Baseline Array observations to produce a complete and flux density - limited sample. Using statistical methods of analysis of the observed visibility amplitude versus projected (u, v) spacing, we have determined the angular size and brightness temperature distribution of bright radio emission from active galactic nuclei. On average, the cores have a diameter ( full width, half-power) of 0.20 mas, which contains about 20% of the total source emission, and 14% +/- 6% of the cores are less than 0.04 mas in size. About 20% +/- 5% of the radio cores have a source frame brightness temperature T-b > 1.0 x 10(13) K, and 3% +/- 2% have T-b > 1.0 x 10(14) K. A model of the high brightness temperature tail suggests that the radio cores have brightness temperatures approximate to1 x 10(12) K and are beamed toward the observer with an average bulk motion of beta = 0.993 +/- 0.004.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	EXTRAGALACTIC RADIO-SOURCES ; PEARSON-READHEAD SURVEY ; SPACE VLBI ; VARIABILITY SURVEY ; STATISTICS ; AGN
收录类别	SCI
语种	英语
WOS记录号	WOS:000225199500009
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/18320]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA 2.Natl Astron Observ, Tokyo 181, Japan 3.Swinburne Univ Technol, Ctr Astrophys & Supercomp, Hawthorn, Vic 2133, Australia 4.Natl Radio Astron Observ, Charlottesville, VA 22903 USA 5.Univ Calgary, Calgary, AB, Canada 6.Australia Telescope Natl Facil, Canberra, ACT, Australia 7.Natl Radio Astron Observ, Socorro, NM 87801 USA 8.Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Kanagawa 2298510, Japan 9.Joint Inst VLBI Europe, Dwingeloo, Netherlands 10.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
推荐引用方式 GB/T 7714	Horiuchi, S,Fomalont, EB,Scott, WK,et al. The VSOP 5 GHz active galactic nucleus survey. IV. The angular size/brightness temperature distribution[J]. ASTROPHYSICAL JOURNAL,2004,616(1):110-122.
APA	Horiuchi, S.,Fomalont, EB.,Scott, WK.,Taylor, AR.,Lovell, JEJ.,...&Shen, ZQ.(2004).The VSOP 5 GHz active galactic nucleus survey. IV. The angular size/brightness temperature distribution.ASTROPHYSICAL JOURNAL,616(1),110-122.
MLA	Horiuchi, S,et al."The VSOP 5 GHz active galactic nucleus survey. IV. The angular size/brightness temperature distribution".ASTROPHYSICAL JOURNAL 616.1(2004):110-122.