HESS (High Energy Stereoscopic System), a ground-based Cerenkov array telescopes has been operated since a few years and in 2004 has performed the ?rst Galactic plane scan with a sensitivity of a few percent of the Crab at energies above 100 GeV, resulting in the discoveryofeightsources,mostofwhichwithoutanycounterpartatdifferentenergies[1,2]. ParticularattentionwasdevotedtoHESSJ1813-178,notidenti?edwithanyknownX/gamma ray emitter and hypothesised to be a dark particle accelerator. Independently, and at the same time, INTEGRAL discovered a new soft gamma-ray source, namely IGR J18135-1751, identi?edasthecounterpartofHESSJ1813-178.Thishighenergyemitter,whosenaturewas still mysterious at the time of the discovery was then associated with the supernova remnant (SNR) G12.82 0.02 [6, 10, 18]. Even if a chance coincidence cannot be completely ruled out in view of the 2 arcmin INTEGRAL error box and the possible angular extension in the high energy,theoverallcharacteristicsofthisstarformingregion[7]comprisingSNRG12.82 0.02 areconsistentwithsupernova/plerionorigin.Morerecently,theMAGIC(MajorAtmospheric Gamma Imaging Cerenkov telescope) collaboration has reported a positive observations of HESSJ1813–178,resultinginagamma-ray?uxconsistentwiththepreviousHESSdetection and showing a hard power law with? = 2.1 in the range from 0.4–10TeV [3].

About the Author

Peter von Ballmoos est n� en 1956 � Z�rich. Apr�s des �tudes de physique � l'Ecole Polytechnique F�d�rale de Z�rich, un doctorat � l'Universit� Technique de Munich, et des post-docs outre Atlantique, il a �t� �lu professeur d'astrophysique � l'Universit� de Toulouse en 1991.
Au sein du Centre d'Etudes Spatiales des Rayonnements de Toulouse, il m�ne des recherches en astrophysique nucl�aire - en particulier l'instrumentation, l'observation et l'interpr�tation des raies gamma nucl�aires. L’observation des raies gamma nucl�aires est une des cl�s aux questions fondamentales sur la structure et l'�volution de l'Univers, et particuli�rement sur les cycles de vie de la mati�re et du comportement de la mati�re dans des conditions extr�mes. Peter von Ballmoos est co-responsable du projet Spectrom�tre INTEGRAL de l'ESA et responsable des projets "lentille gamma" du CNES (CLAIRE, MAX).

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