GeminiFocus 2013 Year in Review | Page 18

Figure 1. Example clusters detected by ACT. The top shows the ACT clusters displaying the temperature decrements observed in 148 GHz, with blue the coldest and red the hottest. The middle and bottom panels show the optical images of the same clusters, with the ACT maps surrounding them. Three of these four clusters were followed up with Gemini. 16 GeminiFocus 2013 Year in Review January2014