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The Compact Radio S...
The Compact Radio Source 2021+614 : Simultaneous 2.3 and 8.3 GHz Mark III VLBI Observations
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- Bartel, N. (author)
- Department of Earth and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA; Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, USA & Harvard-Smithsonian Astrophysical Observatory, Cambridge, MA, USA
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- Shapiro, I.I. (author)
- Department of Earth and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA; Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, USA & Harvard-Smithsonian Astrophysical Observatory, Cambridge, MA, USA
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- Corey, B.E. (author)
- NEROC, Haystack Observatory, Westford, MA, USA
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- Marcaide, J.M. (author)
- Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, USA & Max-Planck-Institut für Radioastronomie, Bonn, Germany
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- Rogers, A.E.E. (author)
- NEROC, Haystack Observatory, Westford, MA, USA
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- Whitney, A.R. (author)
- NEROC, Haystack Observatory, Westford, MA, USA
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- Cappallo, R.J. (author)
- NEROC, Haystack Observatory, Westford, MA, USA
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- Kühr, H. (author)
- Steward Observatory, Tucson, AZ, USA
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- Graham, D. (author)
- Max-Planck-Institut für Radioastronomie, Bonn, Germany
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- Bååth, L.B. 1948- (author)
- Onsala Space Observatory, Chalmers University of Technology, Gothenburg, Sweden
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(creator_code:org_t)
- Philadelphia, PA : Institute of Physics Publishing (IOPP), 1984
- 1984
- English.
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In: Astrophysical Journal. - Philadelphia, PA : Institute of Physics Publishing (IOPP). - 0004-637X .- 1538-4357. ; 279:1, s. 116-121
- Related links:
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Abstract
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- Second-epoch VLBI observations of the flat-spectrum radio source 2021+614 made simultaneously at 2.3 and 8.3 GHz with the Mark III system are reported. The maps derived from these observations reveal a complex, frequency-dependent radio structure on the milliarcsecond scale. The object has four nearly collinear components oriented at a position angle of about 35 degrees and embedded in an extended region. Two of these are optically thin, one has a flat spectrum, and the other appears to be synchrotron self-absorbed in the frequency range 2.3-8.3 GHz. No significant structural variation is found at either frequency between epochs separated by about three years. The formal estimate of the transverse velocity between two components, one with a flat and the other with an inverted spectrum, is v/c = 0.7 + or - 2.3. Remarkable similarities between 2021+614 and the unusual source 0316+413 are discussed.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
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- art (subject category)
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Bartel, N.
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Shapiro, I.I.
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Corey, B.E.
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Marcaide, J.M.
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Rogers, A.E.E.
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Whitney, A.R.
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Cappallo, R.J.
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Kühr, H.
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Graham, D.
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Bååth, L.B. 1948 ...
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- NATURAL SCIENCES
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Halmstad University