VIII/76 Leiden/Argentine/Bonn (LAB) Survey of Galactic HI (Kalberla+ 2005)
Leiden/Argentine/Bonn (LAB) Survey of Galactic HI
Kalberla P.M.W., Burton W.B., Hartmann D., Arnal E.M., Bajaja E.,
Morras R., Poeppel W.G.L.
<Astron. Astrophys., 440, 775 (2005) >
=2005A&A...440..775K 2005A&A...440..775K
ADC_Keywords: H I data ; Interstellar medium; Surveys; Radio sources; Atlases
Keywords: surveys - ISM: general - Galaxy: general - radio lines: ISM -
ISM: clouds
Description:
The LAB survey contains the final data release of observations of
21-cm emission from Galactic neutral hydrogen over the entire sky,
merging the Leiden/Dwingeloo Survey (LDS: Hartmann & Burton 1997,
Cat. VIII/54) of the sky north of -30° with the Instituto
Argentino de Radioastronomia Survey (IAR: Arnal et al.
2000A&AS..142...35A 2000A&AS..142...35A and Bajaja et al. 2005, Cat. VIII/75) of the sky
south of -25°. The angular resolution of the combined material is
HPBW ∼ 0.6°. The LSR velocity coverage spans the interval -450
km/s to +400 km/s, at a resolution of 1.3km/s. 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 ηMB>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.
The Survey is available as 3-D maps, with or without Hanning smoothing,
covering the whole ±458km/s or limited to ±250km/s range.
The resolution of the 3-D maps is 0.5° in galactic longitude
and latitude, and up to 1km/s in velocity.
The survey exists also as (b,v) maps at longitude intervals
stepped by 0.5° -- these files supersedes the FITS files
given in the Hartmann and Burton Atlas (Cat. VIII/54)
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
lab.fit 2880 161052 The LAB Survey (full velocity range,
1km/s resolution)
labh.fit 2880 161052 The LAB Survey (full velocity range, Hanning
smoothed, 1km/s resolution)
lab2.fit 2880 80438 The LAB Survey (full velocity range,
2km/s resolution)
lab250.fit 2880 87668 The LAB Survey (±250km/s range,
1km/s resolution)
lab250h.fit 2880 87668 The LAB Survey (±250km/s range, Hanning
smoothed, 1km/s resolution)
lab250hs.fit 2880 87668 The LAB Survey (±250km/s range, Hanning
smoothed, including stray radiation)
bvmaps.dat 16 721 List of the 721 (v,b) maps in "bvmaps"
subdirectory
bvmaps/* . 721 HI Maps for constant Galactic Longitude
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See also:
http://www.astro.uni-bonn.de/~webrai/german/tools_labsurvey.php :
the LAB Home Page
Byte-by-byte Description of file: bvmaps.dat
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Bytes Format Units Label Explanations
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1- 5 F5.1 deg GLON Galactic longitude of the map
7- 16 A10 --- FITSfile Name of fits file in "bvmaps" subdirectory,
made of 893x361 points (±450km/s velocity
range, ±90° galactic latitude range)
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Acknowledgements:
Peter Kalberla, Bonn University
(End) Francois Ochsenbein [CDS] 18-Jul-2005