A peculiar broad line radio galaxy 1938-155: VLA observation at 90 cm

	A peculiar broad line radio galaxy 1938-155: VLA observation at 90 cm
	An, T; Hong, XY ; Feng, WX ; Zhao, JH
刊名	CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
	2004-12-01
卷号	4 期号:6 页码:527-532
关键词	galaxy : quasar : individual radio continuum : VLA
英文摘要	We observed 1938-155, a broad line radio galaxy (BLRG), with the Very Large Array (VLA) at 90 cm with an angular resolution of 6.8" x 4.0". The source consists of two components separated by 4 arcsec (similar to 20 kpc, for H-0 = 65 km s(-1) Mpc(-l), q(0) = 0.5) along the SE-NW direction. Both components show steep-spectra with a similar spectral index alpha similar to 0.83 +/- 0.07 (S-v proportional to v(-alpha)). The bright double components are surrounded by a low-brightness cocoon. The radio properties of the two bright components are consistent with the hot spots produced by twin jets. An upper limit of similar to 0.0008 for the core dominance parameter (R) is inferred, suggesting there is no prominent radio core in the source. Assuming a modest viewing angle 30degrees, a jet velocity is estimated similar to 0.07 c, based on the jet to counter-jet brightness ratio (J). The lower limit in jet speed inferred is consistent with no Doppler beaming effect on the jet. The radio galaxy 1938-155 could be an exceptional BLRG with no prominent radio core or jet.
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 ; COMPLETE SAMPLE ; GALAXIES ; Z-LESS-THAN-0.3 ; SPECTROSCOPY ; CORES
收录类别	SCI
语种	英语
WOS记录号	WOS:000226863000003
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/19321]
专题	上海天文台_VLBI研究室
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 3.Harvard Univ, Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
推荐引用方式 GB/T 7714	An, T,Hong, XY,Feng, WX,et al. A peculiar broad line radio galaxy 1938-155: VLA observation at 90 cm[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2004,4(6):527-532.
APA	An, T,Hong, XY,Feng, WX,&Zhao, JH.(2004).A peculiar broad line radio galaxy 1938-155: VLA observation at 90 cm.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,4(6),527-532.
MLA	An, T,et al."A peculiar broad line radio galaxy 1938-155: VLA observation at 90 cm".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 4.6(2004):527-532.