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Vlbi Observations of the Compact Components in M82

Published online by Cambridge University Press:  30 March 2016

N. Bartel ,
M.I. Ratner ,
A.E.E. Rogers ,
I.I. Shapiro ,
R.J. Bonometti ,
N.L. Cohen ,
M.V. Gorenstein  and
J.M. Marcaide
N. Bartel
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, U.S.A.
M.I. Ratner
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, U.S.A.
A.E.E. Rogers
Affiliation:
NEROC Haystack Observatory, Westford, MA, U.S.A.
I.I. Shapiro
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, U.S.A.
R.J. Bonometti
Affiliation:
Massachusetts Institute of Technology, Cambridge, MA, U.S.A.
N.L. Cohen
Affiliation:
Massachusetts Institute of Technology, Cambridge, MA, U.S.A.
M.V. Gorenstein
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, U.S.A.
J.M. Marcaide
Affiliation:
Max-Planck-Institut für Radioastronomie, Bonn, Fed. Rep. of Germany, now at Instituto de Astrofisica de Andalucia, Granada, Spain

Extract

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The nearby IrrII galaxy M82 (3C 231, NGC3034) is known to have a complex, very elongated radio brightness distribution in the central region of the galaxy (e.g., Kronberg and Wilkinson 1975). Because of the galaxy’s proximity (distance ~ 3.3 Mpc; Tammann and Sandage 1968), the brightness distribution can be investigated in considerable detail. Recently Unger et al. (1984) and Kronberg, Biermann, and Schwab (1985; see also Kronberg 1986) distinguished about 20 compact components in the central region, most of them unresolved with an upper limit on their angular sizes of ~ 150 mas corresponding to an upper limit on their linear sizes of ~ 2 pc. About half of the components were observed at more than one frequency and at several epochs and were found typically to have steep spectra between 5 and 15 GHz and (Kronberg and Sramek 1985) slowly decreasing flux densities.

Type
Joint Discussions
Information
Highlights of Astronomy , Volume 7: Highlights of Astronomy. As presented at the XIXth General Assembly of the IAU, 1985 , 1986 , pp. 661 - 663
Copyright
Copyright © Reidel 1986

References

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