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VLBI, MERLIN and HST observations of the giant radio galaxy 3C 236
Schilizzi, RT; Tian, WW; Conway, JE; Nan, R; Miley, GK; Barthel, PD; Normandeau, M; Dallacasa, D; Gurvits, LI
AbstractWe present VLBI and MERLIN data at 1.66 and 4.99 GHz on the central component coincident with the nucleus of the giant radio galaxy, 3C 236. The nuclear radio structure is composed of two complexes of emission which are resolved on scales from 1 milli-arcsec (mas) to 1 arcsec. Oscillations with an amplitude of similar to5 degrees can be seen in the compact radio structure. Spectral index distributions are plotted at angular resolutions of 10 and 25 mas and allow us to identify the core component in the south-east emission complex. Re-examination of the HST WFPC-2 image of 3C 236 by de Koff et al. (2000), shows that the normal to the dust disk in the nucleus is similar to 30 degrees from the plane of the sky and within 12 degrees of parallel to the overall orientation of the radio source. We suggest that the radio axis is also at an angle of similar to 30 degrees to the plane of the sky and that the north-west jet is on the approaching side. This orientation implies an overall size of 4.5 Mpc (H-0 = 75 kms(-1) Mpc(-1), q(0) = 0.5) for 3C 236. The coincidence of a dust feature and the south-east compact jet, within the astrometric errors, leads us to suggest that the dust may be in the form of a cloud encountered by the jet in the first similar to 400 pc of its journey out from the nucleus. One-sided emission at 5 GHz on 1 mas scales would suggest that the jets are ejected initially at less than or equal to 35 degrees to the line of sight, but this is difficult to reconcile with the obvious orientation stability of the jet system as a whole. Free-free absorption of the counter-jet may be an alternative explanation for the one-sideness. At the resolution of WSRT data at 327 MHz, the jet to the south-east is apparently continuous over a distance of 2.5 Mpc, making this the largest jet known in the universe. It is likely, however, that activity in the nucleus of 3C 236 is episodic but with a shorter duty cycle than in the double-double sources studied by Schoenmakers et al. (2000) and Kaiser et al. (2000).
KeywordGalaxies : Nuclei Galaxies : Jets Galaxies : Individual : 3c 236
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WOS IDWOS:000168306200005
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Document Type期刊论文
Affiliation1.Joint Inst VLBI Europe, NL-7990 AA Dwingeloo, Netherlands
2.Ist Radioastron, I-40126 Bologna, Italy
3.Univ Bologna, Dept Astron, I-40127 Bologna, Italy
4.Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA
5.Kapteyn Astron Inst, NL-9700 AV Groningen, Netherlands
6.Onsala Space Observ, S-43992 Onsala, Sweden
7.Max Planck Inst Radioastron, D-53121 Bonn, Germany
8.Chinese Acad Sci, Natl Astron Observ, Ctr Astrophys, Beijing 100012, Peoples R China
9.Beijing Astron Observ, Beijing 100012, Peoples R China
10.Leiden Observ, NL-2300 RA Leiden, Netherlands
Recommended Citation
GB/T 7714
Schilizzi, RT,Tian, WW,Conway, JE,et al. VLBI, MERLIN and HST observations of the giant radio galaxy 3C 236[J]. ASTRONOMY & ASTROPHYSICS,2001,368(2):398-407.
APA Schilizzi, RT.,Tian, WW.,Conway, JE.,Nan, R.,Miley, GK.,...&Gurvits, LI.(2001).VLBI, MERLIN and HST observations of the giant radio galaxy 3C 236.ASTRONOMY & ASTROPHYSICS,368(2),398-407.
MLA Schilizzi, RT,et al."VLBI, MERLIN and HST observations of the giant radio galaxy 3C 236".ASTRONOMY & ASTROPHYSICS 368.2(2001):398-407.
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