VLA observations of extragalactic NH3 in IC 342

Details VLA observations of extragalactic NH3 in IC 342 VLA observations of extragalactic NH3 in IC 342

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...272..484h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 272, Sept. 15, 1983, p. 484-487. Research supported by the American Astrono

Astronomy and Astrophysics

Astronomy

8

Ammonia, Astronomical Spectroscopy, Extragalactic Radio Sources, Interstellar Gas, Radio Astronomy, Spiral Galaxies, Antenna Arrays, Brightness Temperature, High Resolution, Image Resolution, Radio Interferometers, Star Formation Rate

Scientific paper

Aperture synthesis maps of the nuclear region in the nearby spiral IC 342 were made in the (J, K) = (1,1) and (2,2) inversion line of NH3. NH3 emission was not detected with an upper limit to the apparent brightness temperature of 0.5 K (referred to 6 sec resolution). Comparison with single-dish measurements indicates that the NH3 emission in the nucleus of IC 342 must be distributed on a size scale greater than 130 pc. These results are interpreted as favoring a model where the NH3 emission is moderately optically thick, thermalized to a gas temperature of approximately 50 K, and clumpy. This is consistent with a high OB star-formation rate in the nucleus accompanied by heated dust and gas.

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