The large-scale distribution of molecular gas in the first Galactic quadrant
D. P. Clemens, D. B. Sanders, N. Z. Scoville;
ApJ, 1988, 327, 139
ABSTRACT:The emission parameters for the molecular component of the interstellar medium are determined
throughout the first Galactic quadrant.
Face-on maps of the peak midplane
molecular density, scale height, and offset from b = 0 deg with roughly 300 pc
resolution are presented.
These maps are compared with the distribution of
cataloged H II regions to test whether both species trace the same Galactic
locations.
The properties of the spiral (or ringlike) arms are deduced from the
derived images and pitch-angle upper limits are estimated.
The H II regions
are strongly correlated with the dense molecular rings.
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
CODE: clemens88