The Compact Radio Source 2021+614: Simultaneous 2.3 and 8.3 GHz Mark III VLBI Observations

Bartel, N.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 (författare)

The Compact Radio Source 2021+614 : Simultaneous 2.3 and 8.3 GHz Mark III VLBI Observations

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.

Shapiro, I.I.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 (författare)
Corey, B.E.NEROC, Haystack Observatory, Westford, MA, USA (författare)
Marcaide, J.M.Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, USA & Max-Planck-Institut für Radioastronomie, Bonn, Germany (författare)
Rogers, A.E.E.NEROC, Haystack Observatory, Westford, MA, USA (författare)
Whitney, A.R.NEROC, Haystack Observatory, Westford, MA, USA (författare)
Cappallo, R.J.NEROC, Haystack Observatory, Westford, MA, USA (författare)
Kühr, H.Steward Observatory, Tucson, AZ, USA (författare)
Graham, D.Max-Planck-Institut für Radioastronomie, Bonn, Germany (författare)
Bååth, L.B.1948-Onsala Space Observatory, Chalmers University of Technology, Gothenburg, Sweden(Swepub:hh)baath (författare)
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, USANEROC, Haystack Observatory, Westford, MA, USA (creator_code:org_t)

Ingår i:Astrophysical JournalPhiladelphia, PA : Institute of Physics Publishing (IOPP)279:1, s. 116-1210004-637X1538-4357

Av författaren/redakt...: Bartel, N.; Shapiro, I.I.; Corey, B.E.; Marcaide, J.M.; Rogers, A.E.E.; Whitney, A.R.; visa fler...; Cappallo, R.J.; Kühr, H.; Graham, D.; Bååth, L.B. 1948 ...; visa färre...

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