An ultraluminous X-ray source (ULX) in the NGC 1313 galaxy, known as NGC 1313 X-1, showcases an unusual X-ray spectral variability, according to a new study recently conducted by an international team of astronomers. The finding is reported in a paper published November 21 on arXiv.org.
Source:
https://phys.org/news/2019-12-unusual-x-ray-spectral-variability-ngc.html