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Astron. Astrophys. Suppl. Ser. 142, 25-30

A new survey for high velocity HI detections in the Southern Hemisphere

R. Morras [*] [*] - E. Bajaja [*] - E.M. Arnal [*] [*] - W.G.L. Pöppel [*]

Send offprint request: R. Morras

Instituto Argentino de Radioastronomía, c.c. 5, (1894) Villa Elisa, Argentina

Received July 27; accepted October 22, 1999


A new high-sensitivity HI survey of the southern sky was made south of Declination -25$^\circ$, at the Instituto Argentino de Radioastronomía (IAR), on a half-degree grid in galactic coordinates. A total of 50980 positions were observed. One of the goals of this survey was to search for high velocity clouds (HVCs). The HI profiles have been smoothed to a velocity resolution of 8 km s-1. The resulting rms noise falls in the range 0.015 to 0.020 K. We have detected 6848 high velocity (HV) components.

Key words: surveys -- ISM: clouds -- ISM: kinematics and dynamics -- Galaxy: halo -- Galaxy: kinematics and dynamics

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