Brandon Christmas, Joe Corrigan
Velocity Mapping of Andromeda
In this module we observed the presence of neutral hydrogen inside of the Andromeda Galaxy. We wished to find out how fast parts of Andromeda were moving towards or away from us. To do this we utilize the doppler shift in neutral hydrogens natural frequency of 1420.4 MHz. If the gas is moving towards us then it will have an appeared faster frequency and the inverse if its moving away from us. We directly looked for a range of frequency in a range of 1380.4 MHz to 1460.4 MHz. This covers the range of the doppler shift that will allow us to map whether the gas is shifted one way or another. The Image above is what we constructed when we mapped the different frequencies to Red, Green, and Blue. Red is moving towards us and Blue is away from us. From those colors we can conclude the andromeda is rotating clockwise on its axis.