A high sensitivity HI survey of the sky at delta <= -25 deg

Abstract

This paper reports on a high sensitivity lambda 21-cm neutral hydrogen survey of the sky south of delta <= -25o. A total of 50980 positions lying on a galactic coordinate grid with points spaced by (bigtriangleup l, bigtriangleup b) = (0\fdg5/cos b, 0\fdg5), were observed with the 30 m dish of the Instituto Argentino de Radioastronomía (IAR). The angular resolution of the survey is HPBW = 30\arcmin, and the velocity coverage spans the interval -450 km s-1 to +400 km s-1 (LSR). The velocity resolution is 1.27 km s-1 and the final rms noise of the entire database is ~ 0.07 K. The brightness temperature scale is accurate to 5%.