XMM-Newton observations of two transient millisecond X-ray pulsars in quiescence

Abstract

We report on XMM-Newton observations of two X-ray transient millisecond pulsars (XRTMSPs). We detected XTE J0929-314 with an unabsorbed luminosity of \~7x10^{31} erg/s. (0.5-10 keV) at a fiducial distance of 10 kpc. The quiescent spectrum is consistent with a simple power law spectrum. The upper limit on the flux from a cooling neutron star atmosphere is about 20% of the total flux. XTE J1807-294 instead was not detected. We can put an upper limit on the source quiescent 0.5-10 keV unabsorbed luminosity <4x10^{31} erg/s at 8 kpc. These observations strenghten the idea that XRTMSPs have quiescent luminosities significantly lower than classical neutron star transients.

arXiv comment4 pages including 1 figures. Accepted for publication in A&A Letters

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Cited by in corpus (23)

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• Cooling of Accretion-Heated Neutron Stars
• Analysing the atolls: X-ray spectral transitions of accreting neutron stars
• Rapid Cooling of the Neutron Star in the Quiescent Super-Eddington Transient XTE J1701-462
• Statistical theory of thermal evolution of neutron stars
• Discovery of kHz QPOs and shifted frequency correlations in the accreting millisecond pulsar XTE J1807--294
• Spin up and phase fluctuations in the timing of the accreting millisecond pulsar XTE J1807-294
• 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
• UltraCompCAT: a comprehensive Catalogue of Ultra-Compact and Short Orbital Period X-ray Binaries
• Linking burst-only X-ray binary sources to faint X-ray transients
• A cold neutron star in the transient low-mass X-ray binary HETE J1900.1-2455 after 10 years of active accretion
• The optical counterparts of Accreting Millisecond X-Ray Pulsars during quiescence
• A low-level accretion flare during the quiescent state of the neutron-star X-ray transient SAX J1750.8-2900
• ADAFs, accretion discs and outbursts in compact binaries
• The Low Quiescent X-Ray Luminosity of the Transient X-Ray Burster EXO 1747-214
• The quiescent X-ray properties of the accreting millisecond X-ray pulsar and eclipsing binary Swift J1749.4-2807
• Physics of accretion flows around compact objects
• Outflows and spectral evolution in the eclipsing AMXP SWIFT J1749.4-2807 with NICER, XMM-Newton and NuSTAR
• The quasi-persistent neutron star soft X-ray transient 1M 1716-315 in quiescence
• Two new bursting neutron star low-mass X-ray binaries: Swift J185003.2-005627 and Swift J1922.7-1716