IRAS sources beyond the solar circle. II. Distribution in the galactic warp.
Abstract
The shape of the outer Galaxy derived from the distribution of molecular clouds with embedded IRAS sources is compared with the shape revealed by H I observations. Of the 1302 selected IRAS sources, 1077 revealed CO J = 1-0 emission and subsequently provided a kinematic distance. CO emission is found at velocities as extreme as 110 km/s, corresponding to heliocentric distances of 15 kpc or galactocentric distances of 20 kpc. The ensemble of clouds features the same warped shape and flaring thickness as shown by the outer-Galaxy H I gas layer. The distribution of IRAS sources is found to end more abruptly at large R than that of H I.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- April 1990
- Bibcode:
- 1990A&A...230...21W
- Keywords:
-
- Infrared Sources (Astronomy);
- Milky Way Galaxy;
- Molecular Clouds;
- Galactic Structure;
- H I Regions;
- Infrared Astronomy Satellite;
- Spatial Distribution;
- Spiral Galaxies;
- Star Formation;
- Astrophysics