Bibliographic Details
| Title: |
The puzzles of RX J1856.5-3754: neutron star or quark star? |
| Authors: |
Trümper, J.E.1, Burwitz, V.1, Haberl, F.1, Zavlin, V.E.1 |
| Source: |
Nuclear Physics B Proceedings Supplement. Jun2004, Vol. 132 Issue 1-3, p560-565. 6p. |
| Subjects: |
Neutron stars, Pulsars, Magnetic fields, Spectrum analysis |
| Abstract: |
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 (∼1013G). Using different models for the temperature distribution across the neutron star surface and assuming blackbody emission to fit the optical and X-ray spectrum, we derive a conservative lower limit of the "apparent“ neutron star radius of 16.5 km × (d/117 pc). This corresponds to the radius for the ”true“ (de-redshifted) radius of 14 km for a 1.4 M◎ 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. [Copyright &y& Elsevier] |
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| Database: |
Engineering Source |
