Galaxies Gone Wild!



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These images show 6 different snapshots of galaxies at different stages of merging:

1. Typically the first sign of an interaction will be a bridge of matter as the first gentle tugs of gravity tease out dust and gas from the approaching galaxies.

2. As the outer reaches of the galaxies begin to intermingle, long streamers of gas and dust, known as tidal tails, stretch out and sweep back to wrap around the cores.

3. These long, often spectacular, tidal tails are the signature of an interaction and can persist long after the main action is over.

4. As the galaxy cores approach each other their gas and dust clouds are buffeted and accelerated dramatically by the conflicting pull of matter from all directions. These forces can result in shockwaves rippling through the interstellar clouds.

5. Gas and dust are siphoned into the active central regions, fuelling bursts of star formation that appear as characteristic blue knots of young stars. As the clouds of dust build they are heated so that they radiate strongly, becoming some of the brightest infrared objects in the sky.

6. Some of the galaxies show striking, highly distorted features, with dust lanes crossing between the galaxies and long filaments of stars and gas extending far beyond the central regions. Beautifully interwoven galaxies are the twisted outcomes of these gargantuan encounters. These colossal and violent interactions between the galaxies, trigger star formation from the large clouds of gas in dazzling, dramatic bursts, creating brilliant blue star clusters.

Keine Übersetzung, aber eine Beschreibung auf Deutsch:
Die Bilder zeigen sechs verschiedene Stadien von wechselwirkenden Galaxien. Der Vorgang der Begegnung und Verschmelzung von Galaxien dauert natürlich Hunderte Millionen von Jahren, sodass er nicht direkt beobachtet werden kann. Hier sind deshalb beispielhaft ausgewählte Bilder des Hubble Teleskops aus der Serie über zusammenprallende Galaxien (heic0810: Galaxies gone wild! 24-Apr-2008) abgebildet. Faszinierend ist dabei, welche große Vielfalt an komplexen Strukturen durch die Interaktion entstehen kann.

1. Als typisches Anzeichen der beginnenden Wechselwirkung bilden sich zarte Schleppen von Staub und Gas zwischen den sich annähernden Galaxien aus.

2. Vermischen sich die äußeren Regionen der Galaxien, so entstehen durch die Gezeitenkräfte lange, gebogene Brücken von Gas und Staub.

3. Diese langen, oft spektakulär anzuschauenden Gezeitenausläufer sind die typischen Anzeichen einer Wechselwirkung und können auch noch lange nach der eigentlichen Begegnung andauern.

4. Wenn sich die Kerne der Galaxien gegenseitig annähern, werden ihre Gas-und Staubwolken verformt und dramatisch beschleunigt. Die wirkenden Kräfte können dazu führen, dass sich regelrechte Druckwellen durch die interstellaren Wolken ausbilden.

5. Durch Schocks und Strömungen verdichten sich Gas und Staub zu zentralen, aktiven Regionen, in denen extrem viele neue Sterne entstehen, erkennbar an den charakteristisch blauen Knoten.

6. Einige der Galaxien zeigen auffallende, sehr verzerrte Strukturen. Staubbahnen kreuzen zwischen den Galaxien. Lange Fäden von Sternen und Gas breiten sich weit entfernt vom Galaxiekern aus. Wunderschöne, verwobene Galaxien sind das Ergebnisse dieser gigantische Begegnungen.


Description These images show 6 different snapshots of galaxies at different stages of merging. It takes hundreds of millions of years for one merger to complete, so the individual stages are illustrated with different images from the fifty nine new images of colliding galaxies that make up the largest collection of Hubble images ever released together. As this astonishing Hubble atlas of interacting galaxies illustrates, galaxy collisions produce a remarkable variety of intricate structures.
Date 24 April 2008(2008-04-24)
Source http://www.spacetelescope.org/images/html/heic0810ac.html
Author NASA, ESA, the Hubble Heritage Team (STScI/AURA)-ESA/Hubble Collaboration and A. Evans (University of Virginia, Charlottesville/NRAO/Stony Brook University), K. Noll (STScI), and J. Westphal (Caltech)


Public domain This file is in the public domain because it was created by NASA and ESA. Hubble material is copyright-free and may be freely used as in the public domain without fee, on the condition that NASA and ESA is credited as the source of the material. The material was created for NASA by Space Telescope Science Institute and for ESA by the Hubble European Space Agency Information Centre under Contract NAS5-26555. Copyright statement at hubblesite.org or copyright statement at spacetelescope.org.
Hubble 01.jpg

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