The two empty spaces above and below the centre are caused by the radio-lobes of the central galaxy. See this NASA Press Release and Astronomy Picture of the Day . This image was also featured in Astronomy Picture of the Day . Temperature map of Perseus calculated from adaptively binned colour maps. Absorption map of Perseus calculated from adaptively binned colour maps.
ADS link .
ADS link . Submitted to refereed journals None here at the moment. This page is not an official page of the Institute of Astronomy.