Topic
The largest gravitationally bound structures in the universe, containing hundreds of galaxies embedded in hot, X-ray-emitting intracluster gas.
Simulations of the El Gordo collision, over two quadrillion solar masses, fit two-state self-interacting dark matter better than noninteracting dark matter. Phys.org's account calls the result a possible solution, not a definite one.
Reality
A team led by Andrea Botteon used Chandra and eROSITA X-rays to trace the radio 'Treble Clef' to a black hole outburst and a cluster collision. The authors call the two-stage origin likely; the merger evidence comes from the shape of the cluster's hot gas.
Perspective Coverage
3 publishersReality
IPAC researchers report that Webb data show galaxy cluster XLSSC 122, 10.4 billion light-years away, holds an unusually dense concentration of matter. Caltech IPAC's summary says that suggests some cosmic structures may have developed much faster than current models predict.
Reality
Hubble observations suggest the core of NGC 4693, a Virgo Cluster spiral about 55 million light-years away, turns out of step with its arms and bulge. Both explanations on offer point to outside influence, though nothing reported yet settles which applies.
Reality
A Tohoku University-led team used the XRISM satellite to read iron emission lines around the quasar H1821+643, and measured turbulent hot gas spanning about 300,000 light-years with roughly 100 times the energy earlier estimates allowed.
Reality