The (re)appearance of NGC 925 ULX-3, a new transient ULX

Hannah P. Earnshaw, Marianne Heida, Murray Brightman +8

We report the discovery of a third ULX in NGC 925 (ULX-3), detected in November 2017 by Chandra at a luminosity of $L_{\mathrm{X}}=(7.8\pm 0.8)\times 10^{39}$ erg s${}^{-1}$. Examination…