GCO Observations of Neutral Hydrogen in the Magellanic Clouds
Joachim Köppen Kiel Jan.2018
Some brief explanations
This tool shows the results of a survey of the Southern Hemisphere skies in the
radio line of atomic hydrogen at 21 cm wavelength, done with the 2.3m diameter
SRT at Grove Creek Observatory.
With a system temperature near 170 K, the integration times are 5 or 10 min on
Test operations in 2018 were done with a system temperature of about 500 K.
Integration times were increased to 2 hours per position.
The results are shown as:
- false colour map of antenna temperature (i.e. the measured intensity) for
galactic longitude and latitude, at a fixed value of the radial
velocity. The colour bar at the right hand side gives the relation between colour
and the value varying linearly between minimum (violet) and maximum (red).
- false colour map of antenna temperature for galactic longitude and
radial velocity, for a given value of the galactic latitude. The strong
feature is the Milky Way.
- false colour map of antenna temperature for radial velocity and
galactic latitude, for a given value of the galactic longitude.
- the spectrum at the specified galactic longitude and latitude is a plot
of antenna temperature as a function of radial velocity. The bump near
vrad = 0 km/s is the emission from neutral hydrogen clouds in the
- The values for the fixed parameter(s) can be changed by the user: enter a new
value in the associated field and hit the return key. NOTE: if the display
does not change, there's simply no data available for that position.
- Mouse position gives the values of all coordinates of the current
position of the mouse.
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