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Spectral studies of quiescent emission and bursts of magnetar candidatesusing XMM-Newton, Chandra and Swift data are presented. Spectra of both thequiescent emission and the bursts for most magnetar candidates are reproducedby a photoelectrically absorbed two blackbody function (2BB). There is a strongcorrelation between lower and higher temperatures of 2BB (kT_LT and kT_HT) forthe magnetar candidates of which the spectra are well reproduced by 2BB. Inaddition, a square of radius for kT_T (R_LT^2) is well correlated with a squareof radius for kT_HT (R_HT^2). A ratio kT_LT/kT_HT ~ 0.4 is nearly constantirrespective of objects and/or emission types (i.e., the quiescent emission andthe bursts). This would imply a common emission mechanism among the magnetarcandidates. The relation between the quiescent emission and the bursts might beanalogous to a relation between microflares and solar flares of the sun. ThreeAXPs (4U 0142+614, 1RXS J170849.0-400910 and 1E 2259+586) seem to have anexcess above ~7 keV which well agrees with a non-thermal hard componentdiscovered by INTEGRAL.

Uniting the Quiescent Emission and Burst Spectra of Magnetar Candidates