The large-scale distribution of molecular gas in the first Galactic quadrant

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Abstract

view Abstract Citations (164) References (27) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Large-Scale Distribution of Molecular Gas in the First Galactic Quadrant Clemens, Dan P. ; Sanders, David B. ; Scoville, Nicholas Z. Abstract Data from the Massachusetts-Stony Brook Galactic Plane CO Survey are analyzed to determine the detailed distribution of molecular (H2) gas in the first quadrant of the Galactic disk. In the inner Galaxy, the near-far distance ambiguity is resolved by exploiting the different angular extents of gas at the near and far locations. The resulting maps of the molecular hydrogen volume density, gas-layer thickness, and centroid offset from b = 0° were plotted as continuous color images with 300 pc mean resolution. The distribution of cataloged giant H II regions was compared with the face-on molecular hydrogen distribution. The H II regions are strongly correlated with the dense molecular rings: the H II region volume density exhibits a quadratic dependence on local H2 gas density. This strong correlation is then used to assign the distances to 50 H II regions with previously ambiguous distances. Publication: The Astrophysical Journal Pub Date: April 1988 DOI: 10.1086/166177 Bibcode: 1988ApJ...327..139C Keywords: Disk Galaxies; Galactic Structure; H Ii Regions; Interstellar Gas; Molecular Gases; Stellar Coronas; Gas Density; Hydrogen; Pitch (Inclination); Sagittarius Constellation; Spiral Galaxies; Star Formation; Astrophysics; GALAXIES: THE GALAXY; GALAXIES: STRUCTURE; INTERSTELLAR: MOLECULES; NEBULAE: H II REGIONS full text sources ADS | data products SIMBAD (2)

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