Ein Filament des kosmischen Netzes
Gibt es ein unsichtbares Netz aus dunkler Materie, das uns umgibt? Sein Einfluss kann im gesamten Kosmos beobachtet werden, aber das Netz bleibt unsichtbar... größtenteils jedenfalls. Dieses Bild der Woche ist das bisher deutlichste Bild eines Filaments dieses kosmischen Netzes. Es wurde mit dem Very Large Telescope der ESO aufgenommen und ist hier in Violett einem Hintergrundbild des Hubble Space Telescope von NASA und ESA überlagert. Das Filament besteht aus Gas, das durch den Einfluss dunkler Materie zusammengeballt wird. Es erstreckt sich über eine Länge von 3 Millionen Lichtjahren und verbindet zwei weit entfernte Galaxien im frühen Universum.
Etwa 85% der gesamten Materie im Universum ist tatsächlich sogenannte Dunkle Materie. Dunkle Materie ist unsichtbar, nicht aber das sie umgebende Gas. Dieses Gas leuchtet jedoch extrem schwach, so dass diese Strukturen sehr schwer zu beobachten sind. Doch nach etwa 150 Stunden Beobachtung gelang es einem Team unter der Leitung von Davide Tornotti, einem Doktoranden der Universität Mailand-Bicocca in Italien, dieses scharfe Bild eines kosmischen Filaments aufzunehmen. Dies war dank der außergewöhnlichen Empfindlichkeit des MUSE-Instruments am VLT möglich, das inzwischen zu einem bewährten Instrument für die Abbildung des kosmischen Netzes geworden ist.
Das Licht dieses Filaments brauchte 11 Milliarden Jahre für die Strecke zu uns und es zeigt genau das, was die Theorie vorausgesagt hat. Im frühen Universum könnten Filamente aus Dunkler Materie ein großes Netz gebildet haben, in dem sich Gas durch ihre Anziehungskraft verfangen hat. Sobald sich das Gas an den Knotenpunkten der Filamente angesammelt hatte, lieferte es den nötigen Rohstoff für die Bildung von Galaxien. Während wir diese mysteriösen Filamente noch genauer studieren, werden wir dann weitere Dinge finden, die sich in diesem dunklen Netz verfangen haben?
Link
Bildnachweis:ESO/D. Tornotti et al./Hubble: M. Revalski, P. Francis et al.
Über das Bild
| ID: | potw2504a |
| Sprache: | de-ch |
| Typ: | Beobachtung |
| Veröffentlichungsdatum: | 29. Januar 2025 11:00 |
| Größe: | 1945 x 1915 px |
Über das Objekt
| Typ: | Early Universe : Cosmology : Morphology : Large-Scale Structure Early Universe : Cosmology : Phenomenon : Dark Matter |
| Constellation: | Grus |
Bildschirm-Hintergrundbilder
Koordinaten
| Position (RA): | 21 42 25.54 |
| Position (Dec): | -44° 19' 48.20" |
| Field of view: | 1.95 x 1.92 arcminutes |
| Orientierung: | Die Nordrichtung liegt 35.4° links zur Vertikale |
Farben & Filter
| Spektralbereich | Wellenlänge | Teleskop |
|---|---|---|
| Optisch Ly-alpha (redshifted) | 513 nm | Very Large Telescope MUSE |
| Ultraviolett F336W | 335 nm | Hubble Space Telescope WFC3 |
| Optisch F450W | 448 nm | Hubble Space Telescope WFPC2 |
| Optisch F702W | 681 nm | Hubble Space Telescope WFPC2 |
| Infrarot F125W+F140W | 1.3 μm | Hubble Space Telescope WFC3 |
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