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Paper: Faint HI 21-cm Emission Line Wings at Forbidden Velocities
Volume: 317, Milky Way Surveys: The Structure and Evolution of Our Galaxy
Page: 38
Authors: Kang, J.; Koo, B.-C.; Heiles, C.
Abstract: We present the results of a search for faint HI 21-cm emission line wings at velocities forbidden by the galactic rotation in large-scale (l, v) diagrams of the galactic plane using the Leiden & Dwingeloo (LD) Survey. These “forbidden-velocity (FV) wings” protrude from their surroundings over more than 20 km s−1 in limited (< 2 °) spatial regions. They are different from high-velocity clouds, but must be associated with some dynamical processes. We have found 73 FV wings in the region | b | ≤ 13° and 0 < l < 260°. We compare their positions with those of supernova remnants and galaxies, and find that 80% are not coincident with those objects. We discuss the statistical properties of FV wings and their origins.
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