Computer Science
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007xmm..prop..135v&link_type=abstract
XMM-Newton Proposal ID #05545101
Computer Science
Supernovae, Supernova Remnants, Diffuse (Galactic) Emission And Isolated Neutron Stars, Rx J0720.4-3125, Xmm-Newton Proposal Id #05545101
Scientific paper
RX J0720.4-3125 belongs to a group of radio-quiet isolated neutron stars, whose spectra are characterized by a black-body spectrum plus one or more broad absorption features. It is unique in that its black-body temperature, and the depth of the absorption feature is variable. The cause for this spectral evolution is unclear, but one proposed model is free precession of a neutron star with two hot spots. Observing in the next XMM-Newton cycle will complete the coverage of a putative precession cycle with a period of 7.1+/-0.5 yr. This puts the precession hypothesis to the ultimate test.
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