The X-ray Variability of the Ultraluminous X-ray Sources in the NGC 4631 galaxy

Jiashun Chen, Jianfeng Wu, Zikun Lin

We perform a systematic study on the long-term X-ray variability for the five ultraluminous X-ray sources (ULXs) in the NGC 4631 galaxy (X1-X5), using Chandra, XMM-Newton, and Swif…