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De 'donkere stroom' is veel groter dan gedacht

Geplaatst op 28-04-2010 om 11u00 door Bert Carrein - 1996 keer gelezen
Nieuws

In 2008 ontdekten sterrenkundigen dat een aantal verre clusters van sterrenstelsels met een snelheid van ongeveer 3 miljoen kilometer per uur gezamenlijk dezelfde kant op bewegen. Nader onderzoek heeft het bestaan van deze intergalactische optocht bevestigd. Sterker nog: hij blijkt nog veel omvangrijker te zijn dan aanvankelijk al het geval leek.

De collectieve beweging van sterrenstelsels — die de 'donkere stroom' wordt genoemd — blijkt zich uit te strekken over een afstand van zeker 2,5 miljard lichtjaar. De verre clusters hebben een kleine maar meetbare snelheid die losstaat van de uitdijing van het heelal en niet groter is naarmate ze zich verder van ons vandaan bevinden.

Dat blijkt uit de manier waarop het hete gas in deze clusters de fotonen van de zogeheten kosmische achtergrondstraling verstrooit. Omdat de clusters niet exact de uitdijing van de ruimte volgen, treden er in de golflengten van de verstrooide fotonen veranderingen op, waaruit een extra snelheidscomponent kan worden afgeleid. De snelheid waarmee de clusters bewegen kan redelijk goed worden bepaald.

Ook staat vast dat de optocht ruwweg in het verlengde beweegt van de verbindingslijn tussen ons en het sterrenbeeld Centaurus. Maar op basis van de beschikbare gegevens kan niet met zekerheid worden vastgesteld of de clusters naar ons toe komen of van ons af bewegen (al lijkt dat laatste het meest waarschijnlijk).

Wat de oorzaak is van de collectieve beweging is nog volkomen onduidelijk. De materieverdeling in het zichtbare heelal kan deze niet verklaren. Het lijkt er op dat zich voorbij de 'horizon' van het zichtbare heelal een massaconcentratie bevindt die de stelsels aantrekt.

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

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Lees ook: De Hercules cluster van melkwegstelsels
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Lees ook: Röntgensatelliet vindt metalen in cluster van sterrenstelsels
Lees ook: De reusachtige radiolobben van Fornax A
Lees ook: Markarian's ogen
Lees ook: Stoflanen in kleurrijke foto van Messier 96

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