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Galaxies around the giant double radio source DA 240 - Redshifts and the discovery of an unusual association
Peng, B; Strom, RG; Wei, J; Zhao, YH
2004-02-01
Source PublicationASTRONOMY & ASTROPHYSICS
Volume415Issue:2Pages:487-498
AbstractWe have investigated galaxies near the giant radio source DA 240 in a study of the source's environment. Spectroscopic observations were obtained with the 2.16 m optical telescope of the National Astronomical Observatories of China. We have measured the redshifts of 26 objects, and find that 16 have nearly the same value as the DA 240 galaxy, and hence form a substantial group. Most of the others have lower redshifts and are probably outlying members of the Zwicky cluster Zw 0756.1+5616. We note that the radio galaxy host dominates the group. Ten of the galaxies in the group are aligned with the lobes of the radio source, and eight are projected on the components. We suggest that there may be a causal relationship, and find some evidence for enhanced activity among these galaxies. Moreover, there is a gradient in their velocities along the source axis. Whatever its explanation, we suggest that it establishes a dynamic timescale of some 10(9) yr. This may have been the time since the last merger, which triggered the giant radio source. The individual galaxy spectra are also presented and briefly discussed.
KeywordGalaxies : Active Galaxies : Individual : Da 240 Galaxies : Ism Galaxies : Distances And Redshifts Techniques : Spectroscopic Ism : Jets And Outflows
DOI10.1051/0004-6361:20034363
Indexed BySCI
Language英语
WOS IDWOS:000188936100016
Citation statistics
Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8143
Collection光学天文研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.ASTRON, NL-7990 AA Dwingeloo, Netherlands
3.Univ Amsterdam, Astron Inst, NL-1012 WX Amsterdam, Netherlands
Recommended Citation
GB/T 7714
Peng, B,Strom, RG,Wei, J,et al. Galaxies around the giant double radio source DA 240 - Redshifts and the discovery of an unusual association[J]. ASTRONOMY & ASTROPHYSICS,2004,415(2):487-498.
APA Peng, B,Strom, RG,Wei, J,&Zhao, YH.(2004).Galaxies around the giant double radio source DA 240 - Redshifts and the discovery of an unusual association.ASTRONOMY & ASTROPHYSICS,415(2),487-498.
MLA Peng, B,et al."Galaxies around the giant double radio source DA 240 - Redshifts and the discovery of an unusual association".ASTRONOMY & ASTROPHYSICS 415.2(2004):487-498.
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