Time variations of the neutral hydrogen absorption spectrum of NGC 1275 /3C 84/

Details Time variations of the neutral hydrogen absorption spectrum of NGC 1275 /3C 84/ Time variations of the neutral hydrogen absorption spectrum of NGC 1275 /3C 84/

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...262...81h&link_type=abstract

Astrophysical Journal, Part 1, vol. 262, Nov. 1, 1982, p. 81-86.

Astronomy and Astrophysics

Astronomy

12

Galactic Nuclei, H Lines, Seyfert Galaxies, Absorption Spectra, Flux Density, Hydrogen Clouds, Radio Sources (Astronomy), Secular Variations, Spectrum Analysis, Very Large Array (Vla), Very Long Base Interferometry

Scientific paper

The neutral hydrogen absorption spectrum and total radio continuum flux density of NGC 1275 (3C 84) have been monitored for temporal changes over a 6-year period. The strengths of two (at 8114 and 8120 km/sec) of the three dominant features in the spectrum have increased as the total flux density of NGC 1275 increased, although not by the same proportion. The third feature at 8106 km/sec has not varied. Assuming a constant optical depth, the flux density of the variable component which is being absorbed by the hydrogen at 8114 and 8120 km/sec was calculated. A flux density of within 0.6 Jy of 4.1 Jy was found for epoch 1974.4, in reasonable agreement with VLBI results for the very compact component of the radio source in NGC 1275. The hydrogen at 8106 km/sec must be absorbing another, more extended component of the radio source that does not vary. High-resolution spectral-line observations with the Very Large Array (VLA) indicate that more than 92% of the absorption at 8106 km/sec occurs in a region less than one arcsec in size. This implies that the hydrogen at 8106 km/sec absorbs radio continuum with a scale size between 0.01-1.0 arcsec..

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