Abstract
We present a first analysis of a deep X-ray spectrum of the isolated neutron star RBS1223 obtained with XMM-Newton. Spectral data from four new monitoring observations in 2005/2006 were combined with archival observations obtained in 2003 and 2004 to form a spin-phase averaged spectrum containing 290 000 EPIC-pn photons. This spectrum shows higher complexity than its predecessors, and can be parameterised with two Gaussian absorption lines superimposed on a blackbody. The line centers, E 2≃2E 1, could be regarded as supporting the cyclotron interpretation of the absorption features in a field B∼4×1013 G. The flux ratio of those lines does not support this interpretation. Hence, either feature might be of truly atomic origin.
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Schwope, A.D., Hambaryan, V., Haberl, F. et al. The complex X-ray spectrum of the isolated neutron star RBS1223. Astrophys Space Sci 308, 619–623 (2007). https://doi.org/10.1007/s10509-007-9375-1
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DOI: https://doi.org/10.1007/s10509-007-9375-1