The 20 year spectral evolution of the radio nucleus of NGC 1275

Details The 20 year spectral evolution of the radio nucleus of NGC 1275 The 20 year spectral evolution of the radio nucleus of NGC 1275

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...278...89o&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 278, March 1, 1984, p. 89-95. NSF-supported research.

Astronomy and Astrophysics

Astronomy

32

Galactic Nuclei, Galactic Radio Waves, Radiant Flux Density, Radio Sources (Astronomy), Seyfert Galaxies, Brightness Temperature, Radio Galaxies, Very Long Base Interferometry

Scientific paper

The paper presents flux density measurements at five radio frequencies of the variable radio source 3C 84 in the nucleus of the Seyfert-like galaxy NGC 1275, covering a time span of 20 yr. Evidence is discussed that 3C 84 is embedded in a thermal gas of density about 2000/cu cm which depolarizes the radio emission and cuts off the spectrum of the compact core below about 2 GHz. The compact core consists of several expanding centimeter wavelength components which evolve toward lower frequencies with time without exhibiting the large decrease in amplitude expected for a simple adiabatically expanding region. A prolonged (though clearly variable) supply of relativistic particles or in situ reacceleration is necessary to explain the observed spectral evolution. Compact components at millimeter and submillimeter wavelengths are necessary to account for the flux density and variability at these wavelengths. These components may be supplying energy to the centimeter wavelength components seen in VLBI maps.

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