Eberhard Karls University of Tübingen | 2018 Apr 09
Astrophysicists of the University of Tübingen publish new results on the occasion of the 15th anniversary of the Gamma Telescope System in Namibia that is operated by the H.E.S.S. collaboration
The H.E.S.S. telescopes have surveyed the Milky Way for the past 15 years searching for sources of gamma radiation. The H.E.S.S. collaboration includes scientists of the Institute of Astronomy and Astrophysics of the University of Tübingen led by Professor Andrea Santangelo and Dr. Gerd Pühlhofer. They are interested in sources of very high energy gamma radiation in the TeV energy range, i.e. in the range of 1012 electron volts, corresponding to a trillion of the energy of visible light photons. For the first time they have been able to classify celestial objects using only the emission of this kind of radiation: very likely they are supernova remnants, which are celestial objects that emerge after the explosion of massive stars. ...
Over 200 sources of TeV radiation are known to date, both Galactic and Extragalactic. “We can often relate the radiation to known astrophysical objects that have been studied before with conventional telescopes in lower frequency bands, e.g. in optical or radio wavebands”, says Gerd Pühlhofer. “Interestingly, however, with the survey observations along the Galactic plane that have been conducted with the H.E.S.S. telescopes, many new sources have been discovered which are not or not clearly associated with objects in lower frequencies.” And the TeV gamma-ray data alone is usually not sufficient to attribute a source to a particular astrophysical type of object. “Those unidentified sources continue to remain a big puzzle in gamma-ray astronomy.” ...
A Search for New Supernova Remnant Shells in the Galactic Plane with H.E.S.S. - H. Abdalla et al (H.E.S.S. Collaboration)
- Astronomy & Astrophysics 612:A8 (Apr 2018) DOI: 10.1051/0004-6361/201730737
arXiv.org > astro-ph > arXiv:1801.06020 > 18 Jan 2018
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