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The Question
(Submitted September 15, 1997)
I am studying about 21cm wavelength or 1420 MHz radio waves
coming from the sky. Do you know where I can find
information about sky mapping with a radio telescope at 21cm?
The Answer
There is a map of the Milky Way in the 21 cm H line, and other wavelength
bands at -
http://adc.gsfc.nasa.gov/mw/milkyway.html
There are also links to key papers describing 21 cm studies. These links
lead into the abstract service of the Astronomical Data System, from which
you can search for similar papers.
Another interesting link is -
http://www.haystack.mit.edu/edu/undergrad/srt/
- which describes the Small Radio Telescope Project at the Haystack
Observatory. They have been able to make a 21 cm map of the
Milky Way using a 9-foot Satellite TV dish antenna. This work
was discussed in the August 96 Sky and Telescope.
I hope that this information is helpful.
Paul Butterworth and Leonard Garcia
for the Ask an Astrophysicist Team
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