Discovery of VHE Gamma-Ray Emission of a Remarkable Young Composite SNR
November 2009 XMM-Newton X-ray image of supernova remnant G292.2-0.5 and, at its center, pulsar PSR J1119-6127. Colors encode X-ray energies: 0.3-1.5 keV (red), 1.5-3.0 keV (green) and 3.0-10.0 keV (blue). From Gonzalez et al.…
HESS J1507-622 – an Unidentified Source off the Galactic Plane
September 2009 H.E.S.S. gamma-ray sky map of a section of the Milky Way which hosts all three sources at latitude below -1.5 degr.: HESS J1507-622, HESS J1442-642 and HESS J1356-645. In other ranges of…
An Extended Source of Gamma Rays near PSR B1706-44
August 2009 Chandra X-ray image (greyscale) superimposed on a 1384 MHz ATCA radio image of the shell of the supernova remnant G343.1-2.3 (from Romani et al. 2005). The approximate boundary of the remnant is…
The Westerlund 1 Star Cluster
June 2009 The massive young stellar cluster Westerlund 1 (Source: Wikipedia, 2MASS/UMass/IPAC-Caltech/NASA/NSF) contains a large number of massive and hot stars. The size of the cluster is about 1′. Westerlund 1 (Wd1) is the…
A VHE gamma ray source in the W51 region: HESS J1923+141
May 2009 W51 is a giant HII region / supernova remnant complex, also known as G49.2-0.7. The image shows the region in 11 cm radio emission, with the 0.5 degr. diameter supernova remnant shell…
Very High Energy Gamma-Rays from Centaurus A
April 2009 Centaurus A is the closest active radio galaxy, a giant elliptical galaxy about 11 million light years distant. The composite view (left) combines X-ray, optical and radio images (right). In the optical,…
HESS J1731-347 – an old supernova remnant?
March 2009 Very high energy gamma ray image of HESS J1731-347. The image is smoothed with a Gaussian of 0.1 degr. width; the resulting “beam size” is indicated by the green circle. At the…
Another first from PKS 2155-304: a joint H.E.S.S. – Fermi campaign
February 2009 The Fermi Gamma-ray Space Telescope was launched from Cape Canaveral on June 11, 2008, carrying the Large Area Telescope (LAT) as the primary instrument, and the GLAST Burst Monitor (GBM). The LAT…
HESS J1809-193 – more than one PWN?
January 2009 The very high energy gamma ray source HESS J1809-193 was discovered in a search for emission associated with pulsars in the range of the H.E.S.S. Galactic Plane Survey (Aharonian et el. 2007).…
Probing Extragalactic Background Light with 1ES 0229+200
November 2007 Model for the evolution of the luminosity of galaxies in the Universe. The plot shows the luminosity per unit volume as a function of wavelength and redshift, i.e. time. The luminosity basically…