XMM-Newton and VLT observations of the isolated neutron star 1E 1207.4-5209

Details XMM-Newton and VLT observations of the isolated neutron star 1E 1207.4-5209 XMM-Newton and VLT observations of the isolated neutron star 1E 1207.4-5209

2003-12-30

arxiv.org/abs/astro-ph/0312646v1

Astron.Astrophys. 418 (2004) 625-637

Astronomy and Astrophysics

Astrophysics

25 pages, 9 postscript figures. Accepted for publication in Astronomy & Astrophysics

Scientific paper

10.1051/0004-6361:20031781

In August 2002, XMM-Newton devoted two full orbits to the observation of 1E 1207.4-5209, making this isolated neutron star the most deeply scrutinized galactic target of the mission. Thanks to the high throughput of the EPIC instrument, ~360,000 photons were collected from the source, allowing for a very sensitive study of the temporal and spectral behaviour of this object. The spectral data, both time-averaged and phase-resolved, yield one compelling interpretation of the observed features: cyclotron absorption from one fundamental (~0.7 keV) and three harmonics, at ~1.4, ~2.1 and ~2.8 keV. Possible physical consequences are discussed, also on the basis of the obvious phase variations of the features' shapes and depths. We also present deep VLT optical data which we have used to search for a counterpart, with negative results down to ~27.

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