First X-ray observations of the young pulsar J1357-6429

Details First X-ray observations of the young pulsar J1357-6429 First X-ray observations of the young pulsar J1357-6429

2007-03-30

arxiv.org/abs/astro-ph/0703802v3

Astronomy and Astrophysics

Astrophysics

Minor changes, including the reference to Esposito et al. (2007 A&A, 467, L45). Accepted by ApJ Letters

Scientific paper

10.1086/521300

The first short Chandra and XMM-Newton observations of the young and energetic pulsar J1357-6429 provided strong indications of a tail-like pulsar-wind nebula associated with this object, as well as pulsations of its X-ray flux with a pulsed fraction above 50% and a thermal component dominating at lower photon energies (below 2 keV). The elongated nebula is very compact in size and may be interpreted as evidence for a pulsar jet. The thermal radiation is most plausibly emitted from the entire neutron star surface of a 10 km radius and a 1.0+/-0.1 K temperature, covered with a magnetized hydrogen atmosphere. At higher energies the pulsar's emission is of a nonthermal (magnetospheric) origin, with a power-law spectrum of a photon index of 1.1-1.3. This makes the X-ray properties of PSR J1357-6429 very similar to those of the youngest pulsars J1119-6127 and Vela with a detected thermal radiation.

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