Long-term variability in the X-ray emission of RX J0720.4-3125

Details Long-term variability in the X-ray emission of RX J0720.4-3125 Long-term variability in the X-ray emission of RX J0720.4-3125

2004-01-05

arxiv.org/abs/astro-ph/0401028v2

Astron.Astrophys. 415 (2004) L31

Astronomy and Astrophysics

Astrophysics

Accepted for publication in Astronomy & Astrophysics Letters

Scientific paper

10.1051/0004-6361:20040009

We detect a gradual, long-term change in the shape of the X-ray spectrum of the isolated neutron star RX J0720.4-3125, such that the spectrum of the source can no longer be described as a blackbody spectrum. The change is accompanied by an energy-dependent change in the pulse profile. If the X-ray emission is influenced by the magnetic field of the pulsar, these changes in spectral shape may point to precession of the neutron star.

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