Focusing Telescopes in Nuclear Astrophysics

Peter Ballmoos

Nov 2007 · Springer Science & Business Media

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503

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About this ebook

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 né en 1956 à Zürich. Après des études de physique à l'Ecole Polytechnique Fédérale de Zürich, un doctorat à l'Université Technique de Munich, et des post-docs outre Atlantique, il a été élu professeur d'astrophysique à l'Université de Toulouse en 1991.
Au sein du Centre d'Etudes Spatiales des Rayonnements de Toulouse, il mène des recherches en astrophysique nucléaire - en particulier l'instrumentation, l'observation et l'interprétation des raies gamma nucléaires. L’observation des raies gamma nucléaires est une des clés aux questions fondamentales sur la structure et l'évolution de l'Univers, et particulièrement sur les cycles de vie de la matière et du comportement de la matière dans des conditions extrêmes. Peter von Ballmoos est co-responsable du projet Spectromètre INTEGRAL de l'ESA et responsable des projets "lentille gamma" du CNES (CLAIRE, MAX).

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