Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...233l.141m&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 233, Nov. 1, 1979, p. L141-L145.
Astronomy and Astrophysics
Astronomy
43
Cyano Compounds, Interstellar Gas, Molecular Gases, Radio Astronomy, Spectrum Analysis, Taurus Constellation, Line Spectra, Stellar Evolution, Stellar Mass, Stellar Temperature, Velocity Distribution, Virial Theorem
Scientific paper
Results are presented for: (1) mapping observations of the Taurus Molecular Cloud 2 (TMC-2) in the J = 9-8 line of HC5N at 23.963888 GHz and in the (J, K) = (1, 1) inversion line of NH3 at 23.694495 GHz; (2) observations of the J = 4-3 line of HC5N in TMC-2 at 10.650643 GHz; (3) detections of the J = 9-8 line of HC5N in L1544 and L1521B; and (4) NH3 and HC5N surveys toward several other dark clouds in Taurus. The results obtained indicate that: (1) TMC-2 is a small (about 0.1 pc in size), dense (mean number density about 40,000 per cu cm), low-mass (about 1 solar mass) fragment in the Taurus complex, with a velocity dispersion at the emission peak of only about twice the thermal value; (2) the HC5N and NH3 emission regions in TMC-2 are coincident; (3) the HC5N line width in TMC-2 is much smaller than the free-fall width; and (4) the size, density, and temperature values deduced for TMC-2 satisfy the virial-theorem requirement for stable equilibrium.
Benson Priscilla J.
Ho Pak Tung
Myers Phil C.
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