An H I stream in the galactic anticenter
Abstract
Observations at 21 cm reveal the presence of an extended, continuous stream of neutral hydrogen moving at high velocity in the galactic anticenter region. The stream is almost linear, over 50 deg long, and characterized by a nearly constant velocity of about -115 km/s along its length. Its average column density of H I is rather low, below 2 x 10 to the 19th/sq cm, and the H I mass is on the order of 0.0028/d-squared solar masses per sq pc, where d is the unknown distance in parsecs. Possible interpretations of its nature are discussed, and the most likely one locates the stream within our own galaxy, suggesting a connection with other perturbations observed in the interstellar medium in the general region of the Per OB2 association.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- June 1980
- DOI:
- 10.1086/158011
- Bibcode:
- 1980ApJ...238..554G
- Keywords:
-
- Centimeter Waves;
- Interstellar Gas;
- Milky Way Galaxy;
- Radio Astronomy;
- Radio Sources (Astronomy);
- Astronomical Maps;
- Galactic Nuclei;
- Gas Flow;
- Hydrogen Atoms;
- Velocity Distribution;
- Astrophysics