Observational evidence for a high velocity cloud collision

Astronomy and Astrophysics – Astrophysics

Scientific paper

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H I Regions, Hydrogen Clouds, Interstellar Matter, Solar Neighborhood, Velocity Distribution, Bubbles, High Speed, Radio Spectra

Scientific paper

H I observations of an area of about 40 sq deg comprising clouds at low, intermediate, and high velocities are presented. The low velocity cloud LVD 127 exhibits emission in several components at velocities between -17 km/s and +7 km/s. Features in position-velocity space with high velocity gradients emerge from LVD 127 and reach velocities of down to -100 km/s. The high velocity cloud belongs to the Chain A complex. It exhibits a core-envelope and head-tail structure, indicating an interaction with the surrounding medium. The intermediate velocity cloud is juxtaposed to the high velocity cloud. A position-velocity map not only shows the juxtaposition but also indicates connections between these clouds at velocities in between. This strongly suggests a physical relation between these clouds at velocities of -55 km/s and -210 km/s, respectively. Most probably, the intermediate velocity cloud resulted from the collision of the high velocity cloud with a low velocity one.

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