Chandra observations of the millisecond X-ray pulsar IGR J00291+5934 in quiescence

Abstract

In this Paper we report on our analysis of three Chandra observations of the accretion-powered millisecond X-ray pulsar IGR J00291+5934 obtained during the late stages of the 2004 outburst. We also report the serendipitous detection of the source in quiescence by ROSAT during MJD 48830-48839. The detected 0.3-10 keV source count rates varied significantly between the Chandra observations from (7.2+-1.2)x10^-3, (6.8+-0.9)x10^-3, and (1.4+-0.1)x10^-2 counts per second for the 1st, 2nd, and 3rd Chandra observation, on MJD 53371.88, 53383.99, and 53407.57, respectively. The count rate for the 3rd observation is 2.0+-0.4 times as high as that of the average of the first two observations. The unabsorbed 0.5-10 keV source flux for the best-fit power-law model to the source spectrum was (7.9+-2.5)x10^-14, (7.3+-2.0)x10^-14, and (1.17+-0.22)x10^-13 erg cm^-2 s^-1 for the 1st, 2nd, and 3rd Chandra observation, respectively. We find that this source flux is consistent with that found by ROSAT [~(5.4+-2.4)x10^-14 erg cm^-2 s^-1]. Under the assumption that the interstellar extinction, N_H, does not vary between the observations, we find that the blackbody temperature during the 2nd Chandra observation is significantly higher than that during the 1st and 3rd observation. Furthermore, the effective temperature of the neutron star derived from fitting an absorbed blackbody or neutron star atmosphere model to the data is rather high in comparison with many other neutron star soft X-ray transients in quiescence, even during the 1st and 3rd observation. If we assume that the source quiescent luminosity is similar to that measured for two other accretion powered millisecond pulsars in quiescence, the distance to IGR J00291+5934 is 2.6-3.6 kpc.

arXiv comment7 pages, 3 Figures, accepted for publication in MNRAS

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• INTEGRAL and RXTE observations of accreting millisecond pulsar IGR J00291+5934 in outburst
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• Statistical theory of thermal evolution of neutron stars
• A Double Outburst from IGR J00291+5934: Implications for Accretion Disk Instability Theory
• The return to quiescence of Aql X-1 following the 2010 outburst
• The neutron star soft X-ray transient 1H1905+000 in quiescence
• Observations of the 599 Hz Accreting X-ray Pulsar IGR J00291+5934 during the 2004 Outburst and in Quiescence
• The 2015 outburst of the accretion-powered pulsar IGR J00291+5934: INTEGRAL and Swift observations
• A cold neutron star in the transient low-mass X-ray binary HETE J1900.1-2455 after 10 years of active accretion
• An accreting millisecond pulsar with black hole-like X-ray variability: IGR J00291+5934
• The optical counterpart of IGR J00291+5934 in quiescence
• The quiescent X-ray properties of the accreting millisecond X-ray pulsar and eclipsing binary Swift J1749.4-2807
• X-ray study of HLX1: intermediate-mass black hole or foreground neutron star?
• Investigating Variability of Quiescent Neutron Stars in the Globular Clusters NGC 6440 and Terzan 5
• XMM-Newton observations of IGR J00291+5934: signs of a thermal spectral component during quiescence
• The puzzling case of the accreting millisecond X-ray pulsar IGR J00291+5934: flaring optical emission during quiescence