92 centimeter VLBI structure of the elliptical galaxy MCG 5-4-18

Details 92 centimeter VLBI structure of the elliptical galaxy MCG 5-4-18 92 centimeter VLBI structure of the elliptical galaxy MCG 5-4-18

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...309..593w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 309, Oct. 15, 1986, p. 593-597. NSF-supported research.

Astronomy and Astrophysics

Astronomy

11

Centimeter Waves, Elliptical Galaxies, Galactic Nuclei, Radio Astronomy, Very Long Base Interferometry, Astronomical Maps, Continuous Spectra

Scientific paper

The 92 cm continuum emission from the nucleus of the elliptical galaxy MCG 5-4-18 (0116+319) was mapped using a seven antenna VLBI array. The emission shows two components separated by about 0.07 arcsec along P.A about 115 deg. Analysis of Perley's (1982) 20 and 6 cm VLA data shows no evidence for high surface brightness features offset from the nucleus by 1-50 kpc. Possible causes of the lack of extranuclear emission are suggested. A total radio spectrum is presented, which shows that the steep-spectrum behavior between 11 and 6 cm does not extend to shorter wavelengths because of the presence of a very compact, time-variable component. The nuclear activity in this elliptical galaxy may be triggered by an interaction with its close binary companion, MCG 5-4-17.

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