Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-12-23
Astronomy and Astrophysics
Astrophysics
6 page, 2 figures, "The Restless High-Energy Universe" Proceedings of the symposium dedicated to six years of successful Beppo
Scientific paper
10.1016/j.nuclphysbps.2004.04.09
We discuss recent Chandra and XMM-Newton observations of the bright isolated neutron star RX J1856.5-3754 and suggest that the absence of any line features is due to effects of a high magnetic field strength (~10^13 G). Using different models for the temperature distribution across the neutron star surface assuming blackbody emission to fit the optical and X-ray spectrum and we derive a conservative lower limit of the "apparent" neutron star radius of 16.5 km x (d/117 pc). This corresponds to the radius for the "true" (de-redshifted) radius of 14 km for a 1.4 Msun neutron star, indicating a stiff equation of state at high densities. A comparison of the result with mass-radius diagrams shows that quark stars and neutron stars with quark matter cores can be ruled out with high confidence.
Burwitz Vadim
Haberl Franck
Truemper Joachim E.
Zavlin Vyacheslav E.
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