What is the nature of RX J0720.4-3125?

Details What is the nature of RX J0720.4-3125? What is the nature of RX J0720.4-3125?

1998-01-06

arxiv.org/abs/astro-ph/9801038v1

MNRAS 297 (1998), L69

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figures, to appear in Monthly Notices

Scientific paper

10.1046/j.1365-8711.1998.01799.x

RX J0720.4-3125 has recently been identified as a pulsating soft X-ray source in the ROSAT all-sky survey with a period of 8.391 s. Its spectrum is well characterized by a black-body with a temperature of $8 \times 10^5$ K. We propose that the radiation from this object is thermal emission from a cooling neutron star. For this black-body temperature we can obtain a robust estimate of the object's age of $\sim 3 \times 10^5$ yr, yielding a polar field $\sim 10^{14}$ G for magnetic-dipole spin down and a value of ${\dot P}$ compatible with current observations.

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