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

E. M. Arnal; E. Bajaja; J. J. Larrarte; R. Morras; W. G.L. Pöppel

doi:10.1051/aas:2000134

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Volume 142 / No 1 (February II 2000)

Astron. Astrophys. Suppl. Ser., 142 1 (2000) 35-40

Abstract

Free Access

Issue		Astron. Astrophys. Suppl. Ser. Volume 142, Number 1, February II 2000


Page(s)		35 - 40
DOI		https://doi.org/10.1051/aas:2000134
Published online		15 February 2000

Astron. Astrophys. Suppl. Ser. 142, 35-40 (2000)

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

E. M. Arnal, E. Bajaja, J. J. Larrarte, R. Morras and W. G.L. Pöppel

Instituto Argentino de Radioastronomía, c.c. 5, (1894) Villa Elisa, Argentina e-mail: arnal@iar.unlp.edu.ar; bajaja@orbis.conae.gov.ar; rimorras@isis.unlp.edu.ar; wpoppel@iar.unlp.edu.ar

Send offprint request to: E.M. Arnal

Received: 19 July 1999
Accepted: 16 November 1999

Abstract

This paper reports on a high sensitivity λ 21-cm neutral hydrogen survey of the sky south of $\delta\leq$ -25°. 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', 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 ~ 0.07 K. The brightness temperature scale is accurate to 5%.  

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