Structural changes in the nucleus of NGC 1275 at 2.8 CM wavelength

Details Structural changes in the nucleus of NGC 1275 at 2.8 CM wavelength Structural changes in the nucleus of NGC 1275 at 2.8 CM wavelength

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....79..268p&link_type=abstract

Astronomy and Astrophysics, vol. 79, no. 3, Nov. 1979, p. 268-273.

Astronomy and Astrophysics

Astrophysics

35

Galactic Nuclei, Galactic Structure, Radio Galaxies, Brightness, Centimeter Waves, Galactic Evolution, Long Term Effects, Relativistic Particles

Scientific paper

Observations at 2.8 cm of the compact radio source in the nucleus of NGC 1275 (3 C 84) during the period 1972 to 1976 show three main regions of emission about 3 pc in extent and aligned in position angle approximately -10 deg. Although there has been no relative motion of the components with a velocity greater than 10,000 km/s, the individual components appear to have expanded with an average radial velocity of about 15,000 km/s over the four year period covered by the observations. Published measurements of the increase in flux density and the observed increase in component size indicate that the entire nuclear source is only about twenty years old. The detailed form of the variations in total flux density suggests a continual acceleration or injection of relativistic particles, powered by an event which began about 20 yr ago. The overall extent of the radio nucleus and the small upper limit to any component motion suggests that energy, perhaps in the form of a relativistic beam, has propagated through a stationary medium.

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