Nieuws

(Vergeten?) Registreren

Natuurlijke deeltjesversnellers in sterrenstelsel NGC 253

Geplaatst op 10-11-2009 om 13u00 door Bert Carrein - 2009 keer gelezen
Nieuws

Met de vier H.E.S.S.-telescopen die in Namibië staan opgesteld, hebben sterrenkundigen gedetailleerde waarnemingen gedaan van de gammastraling die door het sterrenstelsel NGC 253 wordt uitgezonden. Zoals bij zovele actieve sterrenstelsels is het centrale deel van NGC 253 een ware kraamkamer.

Hier worden voortdurend grote aantallen zware sterren geboren, die later als supernovae exploderen. De restanten van deze supernova-explosies zijn natuurlijke deeltjesversnellers. En de energierijke deeltjes die zij produceren reageren met het omringende gas en met elektromagnetische velden, waardoor hoogenergetische gammastraling ontstaat.

Tussen 2005 en 2008 hebben sterrenkundigen de H.E.S.S. alles bij elkaar 119 uur naar NGC 253 laten kijken. Daaruit is gebleken dat het hart van dit stelsel ongeveer vijf keer zo veel gammastraling uitzendt als het (veel grotere) resterende deel.

astronomie sterrenkunde ruimtevaart nieuws

Bron: The Guidestar: http://www.astro-event-group.be

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