The authors measured atomic hydrogen, the principal component of
the interstellar medium in the Milky Way, over a five-year period
using the 25-meter radio telescope of the Netherlands Foundation
for Research in Astronomy. Displayed in several projections, each
map corresponds to a particular velocity interval; separation by
velocity roughly corresponds to separation by distance, or by
energetics. The Leiden/Dwingeloo survey covers the entire sky above
declination -300, on a half-degree grid, over a velocity range of
1000 km/s at 1 km/s resolution. The limiting brightness temperature
sensitivity is 0.07 K. A CD-ROM also accompanies the Atlas, and
contains the entire dataset of the Leiden/Dwingeloo survey in
computer-readable form. The CD-ROM also contains color images in
GIF format, as well as animations displaying the 3-dimensional data
cube.
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