Volume 419, Number 1, May III 2004
|Page(s)||269 - 276|
|Section||Stellar structure and evolution|
|Published online||23 April 2004|
XMM-Newton spectral and timing analysis of the faint millisecond pulsars PSR J0751+1807 and PSR J1012+5307
Centre d'Étude Spatiale des Rayonnements, 9 avenue du Colonel Roche, 31028 Toulouse Cedex 04, France
2 University of Manchester, Jodrell Bank Observatory, Macclesfield, Cheshire, SK11 9DL, UK
3 LPCE/CNRS Orléans, 3A avenue de la Recherche Scientifique, 45071 Orléans Cedex 02, France
4 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
Corresponding author: N. A. Webb, Natalie.Webb@cesr.fr
Accepted: 2 February 2004
We present XMM-Newton MOS imaging and PN timing data of the faint millisecond pulsars PSR J0751+1807 and PSR J1012+5307. We find 46 sources in the MOS field of view of PSR J0751+1807 searching down to an unabsorbed flux limit of ergs cm-2 s-1 (0.2–10.0 keV). We present, for the first time, the X-ray spectra of these two faint millisecond pulsars. We find that a power law model best fits the spectrum of PSR J0751+1807, , with an unabsorbed flux of (0.2–10.0 keV). A power law is also a good description of the spectrum of PSR J1012+5307, , with an unabsorbed flux of (0.2–10.0 keV). However, a blackbody model cannot be excluded as the best fit to this data. We present some evidence to suggest that both of these millisecond pulsars show pulsations in this X-ray band. We find some evidence for a single broad X-ray pulse for PSR J0751+1807 and we discuss the possibility that there are two pulses per spin period for PSR J1012+5307.
Key words: X-rays: stars / stars: pulsars: individual: PSR J0751+1807, PSR J1012+5307 / radiation mechanisms: non-thermal / radiation mechanisms: thermal
© ESO, 2004
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