Using the Hard X-ray Modulation Telescope (HXMT) and the Neutron star Interior Composition Explorer (NICER), astronomers from China and India have observed two X-ray binaries known as GX 339−4 and EXO 1846−031. Results of the observational campaign, published May 29 on the arXiv pre-print repository, reveal essential information regarding the evolution of quasi-periodic oscillations (QPOs) identified in these systems.
