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VIII/11     Berkeley Low-Latitude H I Survey    (Weaver+ 1973)
The Berkeley Low-Latitude Survey of Neutral Hydrogen
    Weaver H., Williams D.R.W.
   <Astron. & Astrophys. Suppl., 8, 1 (1973)>
   =1973A&AS....8....1W
ADC_Keywords: Radio sources ; Surveys ; Radio lines ; H I data


Description:
    This  survey consists of H I 21-cm spectra covering galactic latitudes
    from -10 degrees to +10 degrees and galactic longitudes from 10degrees
    to  250degrees.  The observations were made with the Hat Creek 85-foot
    telescope between  1968 and 1970.  The  individual spectra contain 238
    points per profile spaced  every 5kHz  and cover  a velocity  range of
    250km/s.  The velocity resolution is 2km/s (half-power of each filter)
    and  the half-power beamwidth is 35arcmin.  The spacing between points
    observed   on  the  sky  are  0.25degrees  in  galactic  latitude  and
    0.5degrees in galactic longitude.  Each spectrum or record consists of
    a header followed by 238 antenna temperatures. The header contains the
    galactic longitude, galactic latitude, and central velocity (LSR). The
    catalog contains a total of 38961 spectra.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
catalog.dat     1204    38961   Low latitude H I Survey Data
software.for      80      459   Two Fortran main codes and several subroutines


Byte-by-byte Description of file: catalog.dat

   Bytes Format  Units     Label   Explanations

   1-  4  I4     0.1deg    GLONc   Galactic Longitude
   5-  9  I5     0.01deg   GLATc   Galactic Latitude
  10- 14  I5     0.1km/s   Vo     *Central Velocity (Local Standard of Rest)
  15-1204 238I5   0.1K      TA     *Antenna temperature

Note on Vo, TA:
    The velocity Vo corresponds to channel#122; channels are spaced 5kHz.
    The corresponding VLSRs for the measured antenna temperatures can be
    obtained by the following FORTRAN statements:
      cvel = Vo * 0.1    !  in units of km/s
      do i = 1, 238
         VLSR(i)= cvel + (i-122)* 1.0553
      enddo
    One array of TA was in error and estimated (at  163.5-06.75)


Brief description of software.for:
    FORTRAN codes for use in extracting spectra from the H I surveys of
    Heiles and Habing (VIII/7), Parkes (VIII/8), Argentina (VIII/9),
    Bell Labs (VIII/10), and this catalog (VIII/11).

History:
  * The catalog was received at ADC in 1992; a brief introduction
    was added at CDS (Francois Ochsenbein).
  * The documentation was added in December 1995 at ADC (C.-H. Joseph Lyu)
    One record (#24881, located at 163.5-06.75) was noted as being
    wrong.
  * November 2003 at CDS (F. Ochsenbein): the bad TA values for the
    erroneous record #24881 (163.5-06.75), concerning the values 113 to
    238 of the index in the array, have been replaced by the mean of the
    adjacent records (corresponding to the galactic locations 163.5-06.50
    and 163.5-07.00. The documentation (ReadMe) was revised.
(End) C.-H. Joseph Lyu [Hughes STX/NASA]; Francois Ochsenbein [CDS]  29-Nov-2003