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

S. Campana, N. Ferrari, L. Stella, G. L. Israel
2005 Astronomy and Astrophysics  
We report on XMM-Newton observations of two X-ray transient millisecond pulsars (XRTMSPs). We detected XTE J0929-314 with an unabsorbed luminosity of 7̃x10^31 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 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
more » ... 8 kpc. These observations strenghten the idea that XRTMSPs have quiescent luminosities significantly lower than classical neutron star transients.
doi:10.1051/0004-6361:200500103 fatcat:tzyty2urings3jftbnrlzkc4lm