Wide-angle tailed radio galaxy 1159+583: Observations and models

Journal Article · Thu Nov 01 04:00:00 EST 1979 · Astron. J.; (United States)

DOI:https://doi.org/10.1086/112594· OSTI ID:5866397

Burns, J O; Owen, F N; Rudnick, L

Observations of the wide-angle tailed radio galaxy 1159+583 performed with the NRAO three-element interferometer and the VLA are reported. These observations range in resolution from approx. =7 arcsec (interferometer) to approx. =1 arcsec (VLA), illustrating a variety of scale sizes in the structure. A nuclear component with a relatively steep spectrum (0.7 +- 0.3) appears on the VLA map. The radio tail which extends to the south of the nuclear source has several unusual features. A large resolved (8 arcsec) and bright hot spot lies closest to the nuclear component. A peculiar thin jet (< or =2 arcsec) extends out of the hot spot and away from the galaxy, gradually merging into a tail which is broader by a factor of 5 to 6. This unusual morphology suggests some degree of asymmetry or unsteadiness in the rate and strength of the ejecta. The applicability of independent blob and plasma beam models are discussed for this source. From both energetic and dynamic considerations, a plasma beam (possibly moving at nonrelativistic bulk velocity) is best able to cope with the major features seen on the radio maps.

• Research Organization: National Radio Astronomy Observatory, Charlottesville, Virginia 22901
• OSTI ID: 5866397
• Journal Information: Astron. J.; (United States), Journal Name: Astron. J.; (United States) Vol. 84:11; ISSN ANJOA
• Country of Publication: United States
• Language: English

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