Volume 434, Number 3, May II 2005
|Page(s)||L9 - L12|
|Published online||18 April 2005|
Letter to the Editor
XMM-Newton observations of two transient millisecond X-ray pulsars in quiescence
INAF – Osservatorio Astronomico di Brera, via Bianchi 46, 23807 Merate (Lc), Italy e-mail: firstname.lastname@example.org
2 Università degli Studi di Milano, via Celoria 16, 20133 Milano, Italy
3 INAF – Osservatorio Astronomico di Roma, via Frascati 33, 00040 Monteporzio Catone (Roma), Italy
Accepted: 22 March 2005
We report on XMM-Newton observations of two X-ray transient millisecond pulsars (XRTMSPs). We detected XTE J0929-314 with an unabsorbed luminosity of (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 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 at 8 kpc. These observations strenghten the idea that XRTMSPs have quiescent luminosities significantly lower than classical neutron star transients.
Key words: accretion, accretion disks / binaries: close / stars: individual: XTE J0929-314, XTE J1807-294 / stars: neutron
© ESO, 2005
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