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A radio ridge connecting two galaxy clusters in a filament of the cosmic web

Brunetti, G.; Enßlin, T. A.; Shimwell, T. W. +26 more

Galaxy clusters are the most massive gravitationally bound structures in the Universe. They grow by accreting smaller structures in a merging process that produces shocks and turbulence in the intracluster gas. We observed a ridge of radio emission connecting the merging galaxy clusters Abell 0399 and Abell 0401 with the Low-Frequency Array (LOFAR…

A loud quasi-periodic oscillation after a star is disrupted by a massive black hole

Steiner, James F.; Remillard, Ronald A.; Homan, Jeroen +9 more

The tidal forces close to massive black holes can rip apart stars that come too close to them. As the resulting stellar debris spirals toward the black hole, the debris heats up and emits x-rays. We report observations of a stable 131-second x-ray quasi-periodic oscillation from the tidal disruption event ASASSN-14li. Assuming the black hole mass …