A Search for New Galactic Magnetars in Archival<i>Chandra</i>and<i>XMM‐Newton</i>Observations
A Search for New Galactic Magnetars in Archival<i>Chandra</i>and<i>XMM‐Newton</i>Observations
We present constraints on the number of Galactic magnetars, which we have established by searching for sources with periodic variability in 506 archival Chandra observations and 441 archival XMM-Newton observations of the Galactic plane (| b| < 5°). Our search revealed four sources with periodic variability on timescales of 200-5000 …