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Title:
Faint H I 21 cm Emission Line Wings at Forbidden Velocities
Authors:
Kang, Ji-hyun; Koo, Bon-Chul
Affiliation:
AA(Astronomy Program, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea; , ), AB(Astronomy Program, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea; , )
Publication:
The Astrophysical Journal Supplement Series, Volume 173, Issue 1, pp. 85-103. (ApJS Homepage)
Publication Date:
11/2007
Origin:
UCP
ApJ Keywords:
ISM: General, ISM: Kinematics and Dynamics, ISM: Structure, Radio Lines: ISM, ISM: Supernova Remnants
DOI:
10.1086/519769
Bibliographic Code:
2007ApJS..173...85K

Abstract

We present the results of a search for faint H I 21 cm emission line wings at velocities forbidden by Galactic rotation in the Galactic plane using the Leiden/Dwingeloo H I Survey data and the H I Southern Galactic Plane Survey data. These ``forbidden-velocity wings'' (FVWs) appear as protruding excessive emission in comparison with their surroundings in limited (<~2°) spatial regions over velocity extents of more than ~20 km s-1 in large-scale (l, v) diagrams. Their high velocities imply that there should be some dynamical phenomena associated. We have identified 87 FVWs. We present their catalog and discuss their distribution and statistical properties. We found that 85% of FVWs are not coincident with known supernova remnants (SNRs), galaxies, or high-velocity clouds. Their natures are currently unknown. We suspect that many of them are fast-moving H I shells and filaments associated with the oldest SNRs that are essentially invisible except via their H I line emission. We discuss other possible origins.

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