Radio structure in the inner 1 arcsecond of NGC 1068

Details Radio structure in the inner 1 arcsecond of NGC 1068 Radio structure in the inner 1 arcsecond of NGC 1068

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93...22u&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 93, Jan. 1987, p. 22-28.

Astronomy and Astrophysics

Astronomy

71

Galactic Nuclei, Galactic Structure, Radio Galaxies, Seyfert Galaxies, Spiral Galaxies, Very Long Base Interferometry, Astronomical Maps, Brightness Temperature, Radio Emission, Radio Telescopes

Scientific paper

High-resolution VLA and VLBI observations of NGC 1068 at several different wavelengths are reported. These observations provide new information about the triple radio source in the central arcsec (75 pc) of the galaxy. The 21-cm European VLBI Network observations at 0.05-arcsec resolution detect a core of flux density 89 + or - 10 mJy. This core is dominated by a component less than 20 marcsec (1.5 pc) in diameter that has a brightness temperature of about 10 to the 8th K. Two more components may have been detected by the VLBI observations, one on either side of the compact core. At 0.07-arcsec resolution, the 1.3-cm VLA map of the central arcsec of NGC 1068 reveals a C-shaped radio morphology on scales from 10 to 50 pc. A comparison of the relative locations of the three components in the VLA and VLBI maps shows that the compact core in the VLBI map probably should be identified with the central component in the 1.3- and 2-cm VLA maps. If this identification is correct, the central component in the VLA maps is the actual nucleus of the galaxy. The core of the inner triple radio source may contain a significant flat-spectrum component. The presence of a compact core and the evidence for bending strengthen the argument that the inner triple radio source is produced by a mechanism similar to that operating in powerful radio galaxies. For a minimum-energy configuration, magnetic-field strengths of about 1 mG and energy densities of about 100 nerg/cu cm are found for the components of this source.

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