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Astron. Astrophys. Suppl. Ser. 142, 35-40

A high sensitivity H I survey of the sky at $\delta\leq$ $\delta\leq$ -25°

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

Send offprint request: E.M. Arnal

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

Received July 19; accepted November 16, 1999


This paper reports on a high sensitivity $\lambda$ 21-cm neutral hydrogen survey of the sky south of $\delta\leq$ -25$^\circ $. A total of 50980 positions lying on a galactic coordinate grid with points spaced by ( $\bigtriangleup$l, $\bigtriangleup$b) = (0 $.\!\!^\circ$5/cos b, 0 $.\!\!^\circ$5), were observed with the 30 m dish of the Instituto Argentino de Radioastronomía (IAR). The angular resolution of the survey is HPBW = 30$^\prime$, and the velocity coverage spans the interval -450 $\rm\, km\, s^{-1}$ to +400 $\rm\, km\, s^{-1}$ (LSR). The velocity resolution is 1.27 $\rm\, km\, s^{-1}$ and the final rms noise of the entire database is $\sim$ 0.07 K. The brightness temperature scale is accurate to 5%.

Key words: surveys -- ISM: general -- Galaxy: general radio lines: ISM -- ISM: clouds

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