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Zwarte gaten verklaard door donkerslokken?

Geplaatst op 10-05-2009 om 12u24 door Bert Carrein - 3438 keer gelezen
Nieuws

De allereerste superzware zwarte gaten in het heelal zijn mogelijk ontstaan door een tot nu toe onbekend proces dat door Britse astronomen 'donkerslokken' (dark gulping) is genoemd. Onderzoek aan extreem ver verwijderde sterrenstelsels, die waargenomen worden zoals ze er kort na de oerknal uitzagen, wijst uit dat er al superzware zwarte gaten bestonden toen het heelal minder dan één miljard jaar oud was.

De bekende ontstaansprocessen voor superzware zwarte gaten (de ineenstorting van een zware ster tot een zwart gat dat vervolgens veel extra materie opzuigt, of de ineenstoring van een uitgestrekte gaswolk, of de versmelting van kleinere zwarte gaten) voltrekken zich echter in een veel trager tempo.

Curtis Saxon en Kinnah Wu van het University College London hebben nu modelberekeningen uitgevoerd aan de wisselwerking van gas en donkere materie in jonge clusters van sterrenstelsels. Daaruit blijkt dat er bij de verstoring van zo'n cluster door externe of interne zwaartekrachtsinvloeden in korte tijd een enorme compacte concentratie van donkere materie kan ontstaan in de clusterkern.

Daarbij wordt geen enkele vorm van elektromagnetische straling uitgezonden; vandaar de benaming 'donkerslokken'. De resultaten van de modelberekeningen zijn gepubliceerd in Monthly Notices of the Royal Astronomical Society.

astronomie sterrenkunde ruimtevaart nieuws

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

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