How to make an image in radio astronomy

Radio Astronomy 101
In a rather simplistic viewpoint: you get uv data from your array (bottom right); you convolve it with a point spread function (top right) to get a nicely uniformly gridded data set (top left) and then you take the FFT of it to get a pretty image (bottom left).
Of course that’s a gross under-estimate of what you need todo but highlights a key point – you have to grid the data. This is computationaly expensive and something I’m working on at the moment. The above plots are really just an example of a small python script I’ve developed to try out a few ideas. In reality, you’d have some source structure in there and hopefully your final image would be something that would be much more representative on the sky than the criss-cross pattern you seen in the final image (bottom left).

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: