Imagine the Universe!
Imagine Home  |   Ask an Astrophysicist  |  
Ask an Astrophysicist

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 -

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 -

- 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

Previous question
Main topic
Next question

Imagine the Universe is a service of the High Energy Astrophysics Science Archive Research Center (HEASARC), Dr. Alan Smale (Director), within the Astrophysics Science Division (ASD) at NASA's Goddard Space Flight Center.

The Imagine Team
Acting Project Leader: Dr. Barbara Mattson
All material on this site has been created and updated between 1997-2012.

DVD Table of Contents
Educator's Index