Spectral and temporal variations of the X-ray pulsar RX J0720.4-3125

Details Spectral and temporal variations of the X-ray pulsar RX J0720.4-3125 Spectral and temporal variations of the X-ray pulsar RX J0720.4-3125

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010xmm..prop...24h&link_type=abstract

XMM-Newton Proposal ID #06707001

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Supernovae, Supernova Remnants, Diffuse (Galactic) Emission And Isolated Neutron Stars, Rx J0720.4-3125

Scientific paper

RX J0720.4-3125 belongs to a group of seven isolated and radio-quiet X-ray pulsars discovered during the ROSAT all sky survey; the so called ``Magnificent Seven" (M7). Among them, RX J0720.4-3125 occupies an unique place inasmuch it exhibits spectral and temporal variations on time scales of years that are not seen for the other M7. These variations could be the result of a sudden event (e.g. a glitch), or they are periodic in nature, e.g. caused by free recession. In either case one expects to see further spectral/temporal evolution. Applying a timing solution with constant spin-down (dot{P}) to RX J0720.4-3125 leads to large variable phase residuals with a sinusoidal pattern (but having two humps of different heights) and a variable phase lag [abridge]

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