Volume 467, Number 2, May IV 2007
|Page(s)||L45 - L48|
|Published online||24 April 2007|
Letter to the Editor
Discovery of X-ray emission from the young radio pulsar PSR J1357–6429
Università degli Studi di Pavia, Dipartimento di Fisica Nucleare e Teorica and INFN-Pavia, via Bassi 6, 27100 Pavia, Italy e-mail: email@example.com
2 INAF - Istituto di Astrofisica Spaziale e Fisica Cosmica Milano, via Bassini 15, 20133 Milano, Italy
3 Università degli Studi di Milano - Bicocca, Dipartimento di Fisica G. Occhialini, p.za della Scienza 3, 20126 Milano, Italy
Accepted: 10 April 2007
We present the first X-ray detection of the very young pulsar PSR J1357-6429 (characteristic age of 7.3 kyr) using data from the XMM-Newton and Chandra satellites. We find that the spectrum is well described by a power-law plus blackbody model, with photon index and blackbody temperature eV. For the estimated distance of 2.5 kpc, this corresponds to a 2–10 keV luminosity of ~1.2 1032 erg s-1, thus the fraction of the spin-down energy channeled by PSR J1357-6429 into X-ray emission is one of the lowest observed. The Chandra data confirm the positional coincidence with the radio pulsar and allow to set an upper limit of 3 1031 erg s-1 on the 2–10 keV luminosity of a compact pulsar wind nebula. We do not detect any pulsed emission from the source and determine an upper limit of 30% for the modulation amplitude of the X-ray emission at the radio frequency of the pulsar.
Key words: stars: individual: PSR J1357-6429 / stars: neutron / X-rays: stars
© ESO, 2007
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