H i Spectral-Line Observations in the Direction of W31
Abstract
Contour maps of antenna temperature in the region of W31 are presented. H I absorption features occur at radial velocities of +6.5, +16.5, and +27 km with respect to the local standard of rest. Neither of the two possible kinematic distances is likely to be correct. The true distance of W3l is probably about 4.5 kpc, although noncircular motions may be responsible for a distance error. lii absorption is probably associated with Ht09a emission and OH absorption, but is probably unrelated to H2CO absorption.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- February 1971
- DOI:
- 10.1086/150813
- Bibcode:
- 1971ApJ...164...29R