Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93..168b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 93, Jan. 1987, p. 168-170.
Astronomy and Astrophysics
Astronomy
12
Ammonia, Emission Spectra, Linear Polarization, Millimeter Waves, Molecular Clouds, Orion Nebula, Formaldehyde, H Alpha Line, Radio Spectra
Scientific paper
The results of a VLA search for linear polarization in line emission from ammonia in OMC 1, employing techniques of continuum polarimetry, are reported. A previous search for theoretically predicted polarization in thermal line emission (Wannier et al., 1983) was unsuccessful, perhaps in part because of large beam sizes and resultant cancellation of polarization. The method reported here is complimentary, in achieving high angular resolution but no velocity resolution. No polarization was detected in any of the three ammonia transitions observed, with fractional polarization upper limits of 1 percent in a 4-arcsec beam. A possible reason for the nondetections is the high collision rate in the high-density environment of the Orion 'hot core' region, and resultant scrambling of molecular alignments. A high-resolution (about 5-arcsec) map of the continuum emission from the inner core of the Orion Nebula is included.
Barvainis Richard
Wootten Alwyn
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