Discovery of A Highly Energetic X-Ray Pulsar Powering Hess J1813-178 in the Young Supernova Remnant G12.82-0.02

Astrophysical Journal Letters（2009）SCI 2区

Cited 40|Views6

Abstract

We report the discovery of 44.7 ms pulsations from the X-ray source CXOU J181335.1−174957 using data obtained with the XMM-Newton Observatory. PSR J1813−1749 lies near the center of the young radio supernova remnant G12.82−0.02, which overlaps the compact TeV source HESS J1813−178. This rotation-powered pulsar is the second most energetic in the Galaxy, with a spin-down luminosity of erg s−1. In the rotating dipole model, the surface dipole magnetic field strength is Bs = (2.7 ± 0.6) × 1012 G and the spin-down age –7.5 kyr, consistent with the location in the small, shell-type radio remnant. At an assumed distance of 4.7 kpc by association with an adjacent young stellar cluster, the efficiency of PSR J1813−1749 in converting spin-down luminosity to radiation is ≈0.03% for its 2–10 keV flux, ≈0.1% for its 20–100 keV INTEGRAL flux, and ≈0.07% for the >200 GeV emission of HESS J1813−178, making it a likely power source for the latter. The nearby young stellar cluster is possibly the birthplace of the pulsar progenitor, as well as an additional source of seed photons for inverse Compton scattering to TeV energies.

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Key words

ISM: individual (HESS J1813-178, G12.82-0.02),pulsars: individual (PSR J1813-1749),supernova remnants

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