XMM-Newton observations of IGR J00291+5934: signs of a thermal spectral component during quiescence

Details XMM-Newton observations of IGR J00291+5934: signs of a thermal spectral component during quiescence XMM-Newton observations of IGR J00291+5934: signs of a thermal spectral component during quiescence

2008-10-27

arxiv.org/abs/0810.4804v1

Astronomy and Astrophysics

Astrophysics

5 pages - 2 figures. Accepted for publication on ApJL

Scientific paper

10.1086/595867

We present X-ray observations of the transient accretion-powered millisecond pulsar IGR J00291+5934 during quiescence. IGR J00291+5934 is the first source among accretion powered millisecond pulsars to show signs of a thermal component in its quiescent spectrum. Fitting this component with a neutron star atmosphere or a black body model we obtain soft temperatures (~64 eV and ~110 eV, respectively). As in other sources of this class a hard spectral component is also present, comprising more than 60% of the unabsorbed 0.5-10 keV flux. Interpreting the soft component as cooling emission from the neutron star, we can conclude that the compact object can be spun up to milliscond periods by accreting only <0.2 solar masses.

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