The 21-cm absorption line in NGC1275

Details The 21-cm absorption line in NGC1275 The 21-cm absorption line in NGC1275

Jul 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.262..369e&link_type=abstract

Nature, vol. 262, July 29, 1976, p. 369, 370.

Astronomy and Astrophysics

Astronomy

15

Absorption Spectra, Hydrogen Clouds, Line Spectra, Radio Sources (Astronomy), Radio Spectra, Electromagnetic Absorption, Hydrogen Atoms, Radiant Flux Density, Radio Spectroscopy, Radio Telescopes

Scientific paper

The results of observations of H I absorption in NGC 1275, obtained with the Westerbork Synthesis Radio Telescope and its 80-channel filter spectrometer, are reported. The difference between the channel containing the strongest absorption and the channels containing the continuum shows that the absorbed component is unresolved. Upper limits of 6 sec EW and 9 sec NS are placed on its angular size. The position of the absorbed component is within 1 sec of the position of the small diameter continuum source. These results exclude the possibility that the major part of the absorption occurs in either the 3 min by 4 min halo component or the 30 sec intermediate component. The data are used to derive a limit on the H I mass of possible foreground objects which may be causing the absorption.

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