VIII/76     Leiden/Argentine/Bonn (LAB) Survey of Galactic HI  (Kalberla+ 2005)
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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
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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 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 {eta}MB>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:

       FileName      Lrecl  Records   Explanations

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/*           0      721   HI Maps for constant Galactic Longitude


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

   Bytes Format Units   Label     Explanations

   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)


Acknowledgements:
    Peter Kalberla, Bonn University
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(End)                                   Francois Ochsenbein [CDS]    18-Jul-2005