HESS J1640–465 – A Pulsar Wind Nebula?
March 2007 The gamma-ray source HESS J1640-465 (Fig. 1) was discovered during the survey of the Galactic plane; with a size of 0.045 degrees it is among the most compact sources in the survey,…
A Point-Like Gamma-Ray Source in Monoceros
February 2007 Previous H.E.S.S. results on the supernova remnants RX J1713.7-3946 and RX J0852.0-4622 have clearly demonstrated that supernova shock fronts are capable of accelerating particles to very high energies. Gamma rays are produced…
HESS J1616-508 – Evidence for a Dark Particle Accelerator
January 2007 HESS J1616–508 (Fig. 1) is one of the objects discovered in the H.E.S.S. survey of the Galactic Plane; it is an extended source with a size of about 8 arc min., a…
A novel type of source? Gamma rays from the vicinity of the Wolf-Rayet binary WR 20a
December 2006 Infrared/optical image of the RCW 49 HII region – a massive star formation region about 300-400 light years across – and the Westerlund 2 stellar cluster. Westerlund 2 contains a number of…
TeV gamma rays from the core of M87
November 2006 In 2003, the HEGRA collaboration (Aharonian et al. 2003) reported first indications of very-high-energy (VHE) gamma-ray emission from the giant elliptical galaxy M87. New H.E.S.S. results reported in October 2006 confirm with…
A different type of “source” – Iron nuclei among cosmic rays
October 2006 Cherenkov light generated in the atmosphere by heavy nuclei among cosmic rays: while traversing the atmosphere, the nucleus radiates “direct” Cherenkov light. Then, it interacts and generates a cascade of secondary particles,…
HESS J1804-216 – Supernova remnant or pulsar wind nebula?
September 2006 Radio map of the W30 region from Brogan et al. (2006), showing the roughly circular large supernova remnant W30 (or G8.7-0.1), the compact remnant G8.31-0.09, and a number of additional structures identified…
One Year Later – LS 5039 Revisited
August 2006 Orbital geometry of LS 5039, where a compact object – presumable a black hole – is in a tight orbit around a massive star (Casares et al. 2005). The system is viewed…
HESS J1702-420 – Mystery Source or Pulsar Wind?
July 2006 Pulsar wind nebulae seen by H.E.S.S.; in all cases, the gamma-ray emission is significantly displaced from the pulsar considered as the energy source for the nebula The H.E.S.S. survey of the Galactic…
HESS J1834-087 – Another Supernova Remnant?
June 2006 Among the highlights of H.E.S.S. are certainly the resolved supernova shells RX J1713.7-3946 (see here for newer results) and Vela Junior. However, Green’s catalog lists well over 200 supernova remnants, most of…
