Abstract. We present the final data release of observations of λ21-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 δ = −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 δ = −25• . The angular resolution of the combined material is HPBW ∼ 0.• 6. 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 η MB > ∼ 99% to achieve the same accuracy. The merged and refined material entering the LAB Survey of Galactic H 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 survey to date, with the most extensive coverage both spatially and kinematically.
Abstract. We present the final data release of the high sensitivity λ 21-cm neutral hydrogen survey of the sky south of δ ≤ −25• . A total of 50 980 positions lying on a galactic coordinate grid with points spaced by (∆l, ∆b) = (0.• 5/cos b, 0.• 5) were observed with the 30-m dish of the Instituto Argentino de Radioastronomía (IAR). The angular resolution of the survey is HPBW = 0.• 5 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 data are corrected for stray radiation and converted to brightness temperatures.
Abstract. This paper reports on a high sensitivity λ 21-cm neutral hydrogen survey of the sky south of δ ≤ −25• . A total of 50980 positions lying on a galactic coordinate grid with points spaced by ( l, b) = (0.• 5/cos b, 0.• 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 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%.
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