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Title:
VLA imaging of extragalactic ammonia - Hot gas in the nucleus of IC 342
Authors:
Ho, Paul T. P.; Martin, Robert N.; Turner, Jean L.; Jackson, James M.
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AB(Steward Observatory, Tucson, AZ), AC(California, University, Los Angeles), AD(Max-Planck-Institut für extraterrestrische Physik, Garching bei München, Germany)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 355, May 20, 1990, p. L19-L22. (ApJL Homepage)
Publication Date:
05/1990
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Ammonia, Galactic Nuclei, High Temperature Gases, Intergalactic Media, Very Large Array (Vla), Angular Resolution, Imaging Techniques, Light Emission, Photoionization, Radio Galaxies
DOI:
10.1086/185728
Bibliographic Code:
1990ApJ...355L..19H

Abstract

Extragalactic NH3 is successfully imaged with 5-arcsec resolution using the VLA. Essentially all the single-dish flux is recovered in the interferometer maps. The hot gas (above 70 K), inferred from single-dish NH3 line-intensity ratios, appears to be closely associated with the innermost portions of the nuclear bar seen in CO. Small-scale anticorrelation of the NH3 emission with the central thermal radio continuum emission is likely to be due to heating and photoionization effects.

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