The structure of W49 A as deduced from molecular and recombination line observations

Abstract

view Abstract Citations (58) References (44) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The structure of W49 A as deduced from molecular and recombination line observations. Mufson, S. L. ; Liszt, H. S. Abstract 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. Publication: The Astrophysical Journal Pub Date: March 1977 DOI: 10.1086/155089 Bibcode: 1977ApJ...212..664M Keywords: 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; Astrophysics full text sources ADS |