By analyzing the data from NASA’s Swift spacecraft and from the Neutron Star Interior Composition Explorer (NICER) onboard the International Space Station, astronomers have investigated an active optical transient known as AT2021fxu. Results of the study, published December 14 on the arXiv preprint server, deliver important insights into the nature of this transient, revealing that it is a changing-look active galactic nucleus.
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Source: Phys.org