The isolated neutron star RX J1605.3+3249: Is it a pulsarquestionMark

From archival XMMNewton data of the isolated neutron star RX J1605.3+3249 wefound a candidate period for the star.s rotation of 6.88 s. We propose three 20ksec observations to confirm this. The observations will also allow to verifythe existence of a narrow absorption line at 0.58 keV in the RGS spectrumreported by van Kerkwijk et al. (2004). If both, the suggested spin period andthe narrow absorption line can be confirmed, RX J1605.3+3249 becomes the bestpotential candidate among the ROSAT discovered isolated neutron stars withthermal Xray spectrum to measure both its mass and radius. This would yieldimportant constraints on the equation of state of matter in neutron stars. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]