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A relativistic helical jet in the gamma-ray AGN 1156+295
Hong, XY; Jiang, DR; Gurvits, LI; Garrett, MA; Garrington, ST; Schilizzi, RT; Nan, RD; Hirabayashi, H; Wang, WH; Nicolson, GD
AbstractWe present the results of a number of high resolution radio observations of the AGN 1156+295. These include multi-epoch and multi-frequency VLBI, VSOP, MERLIN and VLA observations made over a period of 50 months. The 5 GHz MERLIN images trace a straight jet extending to similar to2" at PAsimilar to-18degrees. Extended low brightness emission was detected in the MERLIN observation at 1.6 GHz and the VLA observation at 8.5 GHz with a bend of similar to90degrees at the end of the 2 arcsec jet. A region of similar diffuse emission is also seen about 2 arcsec south of the radio core. The VLBI images of the blazar reveal a core-jet structure with an oscillating jet on a milli-arcsecond (mas) scale which aligns with the arcsecond jet at a distance of several tens of milli-arcseconds from the core. This probably indicates that the orientation of the jet structure is close to the line of sight, with the northern jet being relativistically beamed toward us. In this scenario the diffuse emission to the north and south is not beamed and appears symmetrical. For the northern jet at the mas scale, proper motions of 13.7+/-3.5, 10.6+/-2.8, and 11.8+/-2.8 c are measured in three distinct components of the jet (q(0)=0.5, H-0=65 km s(-1) Mpc(-1) are used through out this paper). Highly polarised emission is detected on VLBI scales in the region in which the jet bends sharply to the north-west. The spectral index distribution of the source shows that the strongest compact component has a flat spectrum, and the extended jet has a steep spectrum. A helical trajectory along the surface of a cone was proposed based on the conservation laws for kinetic energy and momentum to explain the observed phenomena, which is in a good agreement with the observed results on scales of 1 mas to 1 arcsec.
KeywordGalaxies : Nuclei Galaxies : Jets Galaxies : Quasars : Individual : 1156+295
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WOS IDWOS:000221299400013
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Cited Times:18[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
3.Joint Inst VLBI Europe, NL-7990 AA Dwingeloo, Netherlands
4.Univ Manchester, Jodrell Bank Observ, Macclesfield SK11 9DL, Cheshire, England
5.ASTRON, NL-7990 AA Dwingeloo, Netherlands
6.Leiden Observ, NL-2300 RA Leiden, Netherlands
7.Inst Space & Astronaut Sci, Kanagawa 2298510, Japan
8.Hartebeesthoek Radio Astron Observ, ZA-1740 Krugersdorp, South Africa
Recommended Citation
GB/T 7714
Hong, XY,Jiang, DR,Gurvits, LI,et al. A relativistic helical jet in the gamma-ray AGN 1156+295[J]. ASTRONOMY & ASTROPHYSICS,2004,417(3):887-904.
APA Hong, XY.,Jiang, DR.,Gurvits, LI.,Garrett, MA.,Garrington, ST.,...&Nicolson, GD.(2004).A relativistic helical jet in the gamma-ray AGN 1156+295.ASTRONOMY & ASTROPHYSICS,417(3),887-904.
MLA Hong, XY,et al."A relativistic helical jet in the gamma-ray AGN 1156+295".ASTRONOMY & ASTROPHYSICS 417.3(2004):887-904.
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