Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...212..664m&link_type=abstract
Astrophysical Journal, Part 1, vol. 212, Mar. 15, 1977, p. 664-682.
Astronomy and Astrophysics
Astronomy
50
Astronomical Spectroscopy, Carbon Monoxide, Formaldehyde, Interstellar Gas, Radio Sources (Astronomy), Spectrum Analysis, Astronomical Maps, Cold Gas, Fine Structure, H Alpha Line, H Ii Regions, Ionized Gases, Nebulae, Radiative Recombination, Spectral Line Width
Scientific paper
The molecular cloud complex W49 A has been observed in the 2.6-mm CO line, the 2-cm H2CO line, and the H76-alpha recombination line. These observations are most consistent with a picture of the complex in which a large H II region lies between two massive molecular clouds. Using a simple hydrodynamic model coupled with calculations of radiative transfer in the recombination lines, it is found that many of the spectral-line and continuum observations obtained on this region can be naturally explained, including: (1) the multiple structure observed in the molecular lines and the single structure in the recombination lines; (2) the local standard of rest (LSR) velocities of both the molecular and recombination lines; (3) the velocity gradients observed in the lines; (4) the continuum emission from the H II region; and (5) the line widths and line-to-continuum ratios of the recombination lines.
Liszt Harvey Steven
Mufson Stuart Lee
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