Other
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.4805w&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #48.05; Bulletin of the American Astronomical Society, Vol. 24, p.1199
Other
Scientific paper
Spectra of the N_2H(+) J = 1 -> 0 transition have been obtained over a 2' x 2' area toward the Orion KL/IRc2 star-forming region with 26'' angular resolution using the IRAM 30 m telescope. The N_2H(+) emission, which exclusively traces the ridge gas, exhibits multiple radial velocities which appear to arise from the presence of at least two clouds of quiescent material. One cloud, ~ 75'' in extent, lies to the north and northeast of Orion-KL with a velocity of VLSR ~ 9.5 km s(-1) . A second cloud, ~ 60'' in extent, lies to the northwest and west with an average velocity of VLSR ~ 7.2 km s(-1) . There appears to be a sharp velocity discontinuity between these two clouds, such that both velocity components are present within a 15'' region centered near IRc2 and other infrared sources. A third region, ~ 35'' in extent with VLSR ~ 8.1 km s(-1) , is seen ~ 15'' south of IRc2 and is about 35'' in extent, which is likely to arise from the ``compact'' ridge. A fourth velocity component of VLSR ~ 6.4 km s(-1) lies 15-30'' southwest of IRc2 and is attributed to Orion-S. The velocity structure of N_2H(+) , therefore, does not uniformly change across OMC-1, and consequently is inconsistent with the presence of large-scale ( ~ 1 - 2') differential rotation of the extended ridge along the SW-NE axis about IRc2. The coincidence of the two larger clouds with star-forming activity in Orion-KL suggests that either the quiescent gas is being pushed apart, or that the star formation may have been triggered by a cloud-cloud interaction.
Sage Leslie J.
Womack Maria
Ziurys Lucy M.
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