A399 and A401 form a close pair of clusters. We have observed them with XMM-Newton in four pointings. Both central regions show significant departures from our idealised picture of relaxed rich clusters. We find enhanced X-ray flux and temperature in the intercluster region, and we argue that it is a compression region, as the two clusters are approaching each other for the first time. It seems likely that in the Abell 399/401 system, we are witnessing two merger remnants, just before they merge together to form a single rich cluster of galaxies.
Memorie della Societa Astronomica Italiana
- Pub Date:
- X-rays : galaxies : clusters;
- intergalactic medium;
- galaxies : clusters : individual (Abell 399;
- Abell 401)