Orsay Survey of Atomic Hydrogen in the Galactic Plane
(displayed by Joachim Köppen Kiel Sept.2013/Jan.2019)


Some brief explanations

This tool shows the results of a survey of the Galactic Plane at the radio line of atomic hydrogen at 21 cm wavelength, done with the 3.3m diameter radio telescope in Orsay, south of Paris, near Orly airport, built and operated by J.J.Maintoux.

The data are in a datacube of galactic longitude (from 4° to 240° in steps of 2°), a single galactic latitude (0°), and radial velocity from -200 to +200 km/s. The results are shown as:


dataset: glong range:


show: vrad = glong = glat =


Mouse position:



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