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The isolated neutron star candidate 2XMM J104608.7-594306

机译：The isolated neutron star candidate 2XMM J104608.7-594306

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Over the last decade, X-ray observations have revealed the existence of several classes of isolated neutron stars (INSs) which areradio-quiet or exhibit radio emission with properties much at variance with those of ordinary radio pulsars. The identification ofnew sources is crucial in order to understand the relations among the different classes and to compare observational constraints withtheoretical expectations. A recent analysis of the 2XMMp catalogue provided fewer than 30 new thermally emitting INS candidates.Among these, the source 2XMM J104608.7-594306 appears particularly interesting because of the softness of its X-ray spectrum,kT = 117 ± 14 eV and N11 = (3.5 ± 1.1) x 1021 cm-2 (3o-), and of the present upper limits in the optical, ma26, Inv25.5and mR 25 (98.76 confidence level), which imply a logarithmic X-ray-to-optical flux ratio log(Fx /Fv ) 3.1, corrected forabsorption. We present the X-ray and optical properties of 2XMM J104608.7-594306 and discuss its nature in the light of twopossible scenarios invoked to explain the X-ray thermal emission from INSs: the release of residual heat in a cooling neutron star, asin the seven radio-quiet ROSAT-discovered INSs, and accretion from the interstellar medium. We find that the present observationalpicture of 2XMM J104608.7-594306 is consistent with a distant cooling INS with properties in agreement with the most up-to-dateexpectations of population synthesis models: it is fainter, hotter and more absorbed than the seven ROSAT sources and possibly locatedin the Carina Nebula, a region likely to harbour unidentified cooling neutron stars. The accretion scenario, although not entirely ruledout by observations, would require a very slow (-10 km s-1) INS accreting at the Bondi-Hoyle rate.

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