Things to think about when looking at cross-matched sources in Navigator

For each cluster, make a final sample of all crossmatched sources that are brighter than r=20.5 and bluer than g-r=1.1. Then use their SDSS coordinates ('ra_SDSS' and 'dec_SDSS' in your data table) to look them up on the SDSS Navigator site (

While looking at your sources, think about the following things.

Is it a good X-ray/optical cross-match? Think about different cases:

Is it likely to be in the cluster?

What kind of galaxy is it in?

X-ray hardness ("HRhs" column in the dataset)