NGC 2403 XMM4 is a super-Eddington neutron star, study finds

By analyzing the data from various space telescopes, astronomers have performed a detailed study of an ultraluminous X-ray source known as NGC 2403 XMM4. Results of the study, published January 5 in the Monthly Notices of the Royal Astronomical Society journal, indicate that this source is a neutron star accreting at super-Eddington rates.