Detecting the Spiral Arms of the Milky Way

This GNU Radio flowgraph processes live or recorded data from the Allen Telescope Array (ATA) to display the 21cm hydrogen line emissions from gas in the Milky Way. The flowgraph filters the raw data to isolate the 21cm signal and outputs a frequency sink plot, showing the characteristic spectral line that indicates the presence of neutral hydrogen in our galaxy. This emission is essential for studying the structure and dynamics of the Milky Way, as the 21cm hydrogen line allows astronomers to trace the distribution of gas, revealing details about the galaxy's rotation and spiral arms.