XMM-Newton observation of the 5.25 ms transient millisecond pulsar XTE J1807-294 in outburst

Preprint

9 July 2003

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.astro-ph/0307174

Abstract

We report on the results obtained for the millisecond transient X-ray pulsar XTE J1807-294 in a 40 min orbital period system, based on an XMM-Newton ToO observation carried out during March 2003. The source was found at a luminosity level of about 2x10^36 erg/s in the 0.5-10 keV range (assuming a distance of 8 kpc). We confirm the presence of the 5.25 ms pulsations (after accounting for the orbital modulation) and find a pulsed fraction of 5.8% in the 0.3-10 keV band. The pulse shape in nearly sinusoidal. The spectral continuum of the source is well fitted by an absorbed Comptonization model plus a soft component. No emission or absorption lines have been detected in the 0.5-10 keV range with upper limits of 10-40 eV. The reported analysis represent the first detailed study of this source, the fourth belonging to the ultra-compact binary system class hosting an accreting neutron star.

Keywords

All Related Versions

Version 1, 2003-07-09, ArXiv
Published version: The Astrophysical Journal, 594 (1), L39.

This publication has 0 references indexed in Scilit: