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The 599 Hz X-ray pulsar IGR J00291+5934

The 599 Hz X-ray pulsar IGR J00291+5934. D. K. Galloway 1 , C. B. Markwardt 2 , E. H. Morgan 1 , D. Chakrabarty 1 , T. E. Strohmayer 2 and R. Remillard 1 1. Center for Space Research, MIT; 2. LHEA, NASA Goddard Space Flight Center. Discovered Dec. 2 by INTEGRAL (Eckert et al., ATel 352)

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The 599 Hz X-ray pulsar IGR J00291+5934

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  1. The 599 Hz X-ray pulsar IGR J00291+5934 D. K. Galloway1, C. B. Markwardt2, E. H. Morgan1, D. Chakrabarty1, T. E. Strohmayer2 and R. Remillard1 1. Center for Space Research, MIT; 2. LHEA, NASA Goddard Space Flight Center • Discovered Dec. 2 by INTEGRAL (Eckert et al., ATel 352) • RXTE observations revealed 599 Hz pulsations with ~9% amplitude (Markwardt et al. ATel 353) • Mission-long ASM lightcurve revealed two previous outbursts, 3 and 6 years previously (Remillard et al., ATel 357) • Variable radio counterpart (ATels 355, 361, 364) R~17.4 optical counterpart (Fox & Kulkarni, ATel 354; see also ATels 356, 363, 366)

  2. 886 The fastest millisecond X-ray pulsar… so far • Compare with two fastest radio pulsars at 622, 642 Hz, and fastest burst oscillation source at 620 Hz • Assuming mass transfer is driven by gravitational radiation in the 2.46 hr binary orbit , distance is 3.3-12 kpc • Mass function = 2.810-5M; minimum companion mass is0.038M, likely a heated brown dwarf donor (e.g. Bildsten & Chakrabarty 2001, ApJ 557, 292) • INTEGRAL offers a new avenue for detecting these rare sources IGR J00291+5934: f0 = 598.892130657(2) Hz aXsini = 64.9912 lt-ms Porb = 8844.0903(6) s T90 = 53345.18751580(5) MJD

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