The Virgo Consortium

The Hydrangea Project

The most massive galaxy cluster

Visualization of the most massive galaxy cluster simulated as part of the Hydrangea project. The brightness of the image represents the gas density, while the colour encodes the temperature of the gas (blue: cold, white: hot).


The Hydrangea Project, led by Yannick Bahé and involving researchers in Germany, the UK, the Netherlands, and Spain, is a large suite of 24 simulations of massive galaxy clusters run with the same code as used for the EAGLE project. These simulations employ the so-called “zoom-in” technique, which focuses computing power on a relatively small region (with a diameter approximately 100 million light years). This core region was carefully selected to contain a massive galaxy cluster, within a total volume that is many thousand times larger.

Projected gas density

Projected gas density is shown on the left, gas temperature on the right (white is hottest, black coldest).


The initial paper for “The Hydrangea Project” has been published as Bahé et al. 2017. For more information please visit MPA’s monthly highlight article or GCS’s project description page or contact Yannick Bahé.