| Issue |
A&A
Volume 434, Number 3, May II 2005
|
|
|---|---|---|
| Page(s) | L9 - L12 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361:200500103 | |
| Published online | 18 April 2005 | |
Letter to the Editor
XMM-Newton observations of two transient millisecond X-ray pulsars in quiescence
1
INAF – Osservatorio Astronomico di Brera, via Bianchi 46, 23807 Merate (Lc), Italy e-mail: campana@merate.mi.astro.it
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
Received:
28
December
2004
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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