We present the discovery of the Vela-like radio pulsar J1856+0245 in the Arecibo PALFA survey. PSR J1856+0245 has a spin period of 81 ms, a characteristic age of 21 kyr, and a spin-down luminosity Ä– p 4.6 x 10 36 ergs s-1. It is positionally coincident with the TeV Î³-ray source HESS J1857+026, which has no other known counterparts. Young, energetic pulsars create wind nebulae, and more than a dozen pulsar wind nebulae have been associated with very high energy (100 GeV-100 TeV) Î³-ray sources discovered with the HESS telescope. The Î³-ray emission seen from HESS J1857+026 is potentially produced by a pulsar wind nebula powered by PSR J1856+0245; faint X-ray emission detected by ASCA at the pulsar's position supports this hypothesis. The inferred Î³-ray efficiency is ÎµÎ³ p LÎ³/Ä– p 3.1 % (1-10 TeV, for a distance of 9 kpc), comparable to that observed in similar associations. Â© 2008. The American Astronomical Society.
J. W.T. Hessels, et. al., (2008) PSR J1856+0245: Arecibo discovery of a young energetic pulsar coincident with the TeV g-RAY source HESS J1857+026.Astrophysical Journal682:1L41. DOI: http://doi.org/10.1086/590908