Other
Scientific paper
May 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979phdt.........2r&link_type=abstract
Ph.D. Thesis California Inst. of Tech., Pasadena.
Other
2
Absorption Spectra, Hydrogen Clouds, Planetary Atmospheres, Angular Resolution, Galaxies, Mapping, Spectrum Analysis
Scientific paper
The high-velocity 21 cm absorption feature in NGC1275 (=3C84) was mapped at an angular resolution of a few milliarcseconds. The method of analysis makes use of both the absolute amplitude of the visibility function in the continuum, and the relative amplitude and phase between the line and continuum. Fine-scale structure in the continuum is determined from the observations, and the 21 cm structure of 3C84 on angular scales covering almost six orders of magnitude is reviewed. Two basic hypotheses which was advanced to elucidate the 21 cm absorption and other high-velocity features in NGC1275 are discussed. The results of the present investigation strongly support the interpretation that all the high-velocity features arise in a superposed galaxy in the Perseus Cluster. The alternative model, in which the high-velocity gas is ejected from the active nucleus, is inconsistent with the structure observed in the H1 absorption.
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