High resolution observations of NGC1275 with a four-element intercontinental radio interferometer

Details High resolution observations of NGC1275 with a four-element intercontinental radio interferometer High resolution observations of NGC1275 with a four-element intercontinental radio interferometer

Jan 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.259...17p&link_type=abstract

Nature, vol. 259, Jan. 1-8, 1976, p. 17-20.

Astronomy and Astrophysics

Astronomy

68

Galactic Nuclei, Interferometers, Radio Galaxies, Active Galaxies, Astronomical Models, Extragalactic Radio Sources, Galactic Structure, Radiation Distribution

Scientific paper

Results are reported for observations of the active radio galaxy NGC 1275 which were made at a frequency of 10,650 MHz and a resolution of 0.00025 sec with a four-element intercontinental interferometer system extending from West Germany to California, Observational data are presented in the form of plots of fringe amplitude as a function of interferometer hour angle and are reduced to obtain a map of the radio structure of the galaxy's nucleus. The radio nucleus is found to consist of three apparently stationary emission features whose centers extend over a distance of 3 pc on a nearly straight line in position angle -9 deg. The brightest feature is located near the center of the source, and a significant part of its emission originates from a region smaller than 0.1 pc. It is noted that one or more of the features have changed their intensity or size in the past three years. A preferred elongation direction of all three radio features and several optical H-alpha filaments is found which suggests a common alignment mechanism that is effective over linear scales ranging from a few parsecs in the dense nucleus of the galaxy to more than 100 kpc in intergalactic space.

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