[Discuss-gnuradio] gr-radio-astronomy: a good annotated trace of Sgr A

[Marcus Leech]

Here's a meridian transit observation of the region around Sgr A--the 
source near the center of our galaxy.

http://www.propulsionpolymers.com/radioastronomy/galactic_plane.png

There's lumpiness due both to receiving system instability, and the fact 
that the galactic background radiation is not
 uniformly distributed in intensity.   Around 16:20 or so, there's some 
interference from the Sun, since it
 transited only 2 beam-widths above where I was pointing.  I annotated 
it with TGIF.

The quasi-discrete source at the galactic center is driven by a 
postulated black hole.  The physics are complicated, but
 part of the emission is thermal, due to heating of the surrounding gas 
and dust by gamma and x-rays coming out of
 the event horizon around the black hole as matter falls into it.