The GEM 408 MHz Receiver System

GEM 408 MHz Rationale

The frequency 408 MHz was chosen because the Galaxy produces a large (of order 100 K) emission signal at that frequency. The only full sky radio map exisiting is at 408 MHz and this provides both a test of our technique and a successful collection of data at 408 MHz could make the existing Haslam et al. survey much more valuable by providing an independent calibration and cross-check. A GEM success could lead to a residual destriping of these data which we have found to be very good thus far.

Reports on the 408 MHz Receiver and Feed

Summary Report (missing)
408 MHz Parts list (missing)
photograph of 408 MHz on GEM dish at Bishop California. See also other Teide pictures.
Antenna beam pattern at 408 MHz

The project has been supported in part by the US Department of Energy, by the US National Science Foundation, by the Progetto Italia Antartide, by INPE-Brazil, and by Colciencias of Colombia. Some of the publications to date are on the following GEM publication list.

Some preliminary 408 MHz GEM maps

Return to the Smoot Group page for a complete description of Dr. Smoot's group's research activities.