A high sensitivity Hi survey of the sky at δ ≤ -25°

Abstract

This paper reports on a high sensitivity λ 21-cm neutral hydrogen survey of the sky south of -25°. A total of 50980 positions lying on a galactic coordinate grid with points spaced by ( l, b) = (05/cos b, 05), were observed with the 30 m dish of the Instituto Argentino de Radioastronomía (IAR). The angular resolution of the survey is HPBW = 30', and the velocity coverage spans the interval -450 to +400 (LSR). The velocity resolution is 1.27 and the final rms noise of the entire database is ~ 0.07 K. The brightness temperature scale is accurate to 5%.