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RX J1856: astrophysical evidence for quark stars

Frederick M Walter

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On 10 April 2002 NASA announced that Chandra observations of the compact object RX J185635-3754 implied that it was smaller than allowed by models of neutron stars, and that this was evidence for the existence of quark stars. If true, this is a very important observation. But the bulk of the evidence does not support this assertion. I shall review the extant data, and show that neither the data nor theory supports this interpretation. On the other hand, the data show that compact objects may be far stranger than we thought.


PACS

97.60.Jd Neutron stars

01.30.Rr Surveys and tutorial papers; resource letters

97.10.Nf Masses

Subjects

Education and communication

Astrophysics and astroparticles

Dates

Issue 1 (January 2004)

Received 16 May 2003, in final form 19 June 2003

Published 11 December 2003



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