Some brief explanations

This tool shows the results of two surveys of the area around the Magellanic Clouds 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 4 hours on each position. After some repair work in 2019, the observations were repeated.

In 2023 this area of the entire sky was scanned by 24 hour drift scans. The data in the area around the Magellanic Clouds is shown here in three resolutions, 0.75°, 0.5°, and 0.3°.

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 v_rad = 0 km/s is the emission from neutral hydrogen clouds in the Milky Way.
• 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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