Is RXJ1856.5-3754 a strange quark star?

Details Is RXJ1856.5-3754 a strange quark star? Is RXJ1856.5-3754 a strange quark star?

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003nupha.718..351d&link_type=abstract

Nuclear Physics A, Volume 718, p. 351-358.

Physics

Nuclear Physics

3

Scientific paper

Deep Chandra LETGS observations of the isolated neutron star candidate RXJ1856.5-3754 have demonstrated that, to within the accuracy of the observations, the X-ray spectrum is consistent with a blackbody with a temperature of 7 × 105 K and a radiation radius R∞ ~ 5 km-much too small for current neutron star equations of state. The small apparent radius, lack of X-ray pulsations down to a level of 3%, and failure to explain the observations in terms of current neutron star models, lead to the suggestion that RXJ1856.5-3754 might be a strange quark star. We discuss some issues associated with this interpretation and look briefly at RX J1856.5-3754 in the context of other have smooth featureless spectra. Both X-ray and optical spectra of some of these objects might be explained by ``naked'' crusted neutron stars or strange quark stars with thin coronae. RX J1856.5-3754 remains an interesting strange quark star candidate.

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