Study the X-ray Dust Scattering Halos with Chandra Observations of Cygnus X-3 and Cygnus X-1

Jingen Xiang, Shuang Nan Zhang, Yangsen Yao

We improve the method proposed by Yao \emph{et al} (2003) to resolve the X-ray dust scattering halos of point sources. Using this method we re-analyze the Cygnus X-1 data observed…