Clumping in Orion KL - 2-arcsecond maps of ammonia

Details Clumping in Orion KL - 2-arcsecond maps of ammonia Clumping in Orion KL - 2-arcsecond maps of ammonia

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...124...23p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 124, no. 1, July 1983, p. 23-38.

Astronomy and Astrophysics

Astrophysics

154

Ammonia, Astronomical Maps, Molecular Clouds, Orion Nebula, Stellar Evolution, Angular Resolution, Brightness Temperature, Hyperfine Structure, Radial Velocity

Scientific paper

The NH3 emissions of the Kleinmann-Low-IR nebula in Orion are mapped with an angular resolution of 2 arcsec from data obtained on October 4, 1980, with the VLA at NRAO. Other parameters include field of view = 2 arcmin, velocity resolution = 1.5 km/s, velocity range = -40 to 40 km/sec, and channel rms noise = 50 mJy/clean beam area (equivalent to a main-beam brightness temperature of 32 K). Most of the IR sources observed at 20 microns (except the non-NH3-emitting source BN) appear near the edge of the averaged map for velocities from -8.4 to 12.3 km/s. Significant changes in the positions of intensity maxima observed in the individual velocity-channel maps are considered evidence of clumps with main-beam temperatures greater than 100 k and linewidths less than about 1.5 km/s. The 'spike', 'hot-component', and 'plateau' portions observed in 2 x 2-arcsec-region spectra of intensity maxima are interpreted as undisturbed gas, gas heated and compressed by IR-source winds, and interactions of these winds with 'hot-component' condensations, respectively.

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