Astronomy & Astrophysics

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Issue		A&A Volume 440, Number 2, September III 2005
Page(s)		775 - 782
Section		On-line catalogs and data
DOI		10.1051/0004-6361:20041864

A&A 440, 775-782 (2005)
DOI: 10.1051/0004-6361:20041864

The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI

Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections

P. M. W. Kalberla¹, W. B. Burton^{2, 3}, Dap Hartmann^{2, 4}, E. M. Arnal^{5, 6}, E. Bajaja⁵, R. Morras^{5, 6} and W. G. L. Pöppel⁵

¹ Radioastronomisches Institut der Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
    e-mail: pkalberla@astro.uni-bonn.de
² Sterrewacht Leiden, Postbus 9513, 2300 Leiden, The Netherlands
³ National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, Virginia 22903, USA
    e-mail: bburton@nrao.edu
⁴ Delft University of Technology, Postbus 5, 2600 Delft, The Netherlands
    e-mail: L.Hartmann@TBM.TUDelft.nl
⁵ Instituto Argentino de Radioastronomía, c.c. 5, (1894) Villa Elisa, Argentina
    e-mail: [bajaja;arnal]@iar.unlp.edu.ar; rimorras@isis.unlp.edu.ar; wpoeppel@iar.unlp.edu.ar
⁶ Facultad de Ciencias Astronómicas y Geofísicas, UNLP, Av. Paseo del Bosque, s/n, 1900 La Plata, Argentina

(Received 19 August 2004 / Accepted 3 March 2005 )

Abstract
We present the final data release of observations of $\lambda$ 21-cm emission from Galactic neutral hydrogen over the entire sky, merging the Leiden/Dwingeloo Survey (LDS: Hartmann & Burton 1997, Atlas of Galactic Neutral Hydrogen) of the sky north of $\delta$ = -30° with the Instituto Argentino de Radioastronomía Survey (IAR: Arnal et al. 2000, A&AS, 142, 35; and Bajaja et al. 2005, A&A, 440, 767) of the sky south of $\delta$ = -25°. The angular resolution of the combined material is HPBW ~ $0\fdg6$ . The LSR velocity coverage spans the interval -450 km s^-1 to +400 km s^-1, at a resolution of 1.3 km s^-1. The data were corrected for stray radiation at the Institute for Radioastronomy of the University of Bonn, refining the original correction applied to the LDS. The rms brightness-temperature noise of the merged database is 0.07-0.09 K. Residual errors in the profile wings due to defects in the correction for stray radiation are for most of the data below a level of 20-40 mK. It would be necessary to construct a telescope with a main beam efficiency of $\eta_{{\rm MB}} \ga 99$ % to achieve the same accuracy. The merged and refined material entering the LAB Survey of Galactic H I is intended to be a general resource useful to a wide range of studies of the physical and structural characteristices of the Galactic interstellar environment. The LAB Survey is the most sensitive Milky Way H I survey to date, with the most extensive coverage both spatially and kinematically.

Key words: surveys -- radio lines: ISM -- Galaxy: structure

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