Unveiling the quiescent state properties of the transient AXP XTE J1810-197

This XMM program is aimed at studying the quiescent state of the Anomalous XrayPulsar (AXP) XTE J1810197. The transient Xray behaviour of this source ismaking possible to study its properties over an unprecedented range of fluxlevels and energies. Moreover, the recent detetion of XTE J1810197 as one ofthe brightest (fading) radio pulsars (a unique property amongst AXPs) make evenmore compelling the need of carrying out simultaneous multiwavelengthobservations and of considering its broad band emission as a whole whenmodelling the timing and spectral properties. Thus, this source represents aRosetta stone for our understanding of the nature and emission mechanism ofAXPs, and for a unified scheme for isolated neutron stars (NSs) encompassing dissimilar classes. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]