Ett filament i den kosmiska väven
Finns det ett osynligt nät av mörk materia som omger oss? Dess inflytande kan observeras över hela kosmos, men nätet förblir osynligt... för det mesta. Denna veckas bild visar den tydligaste bilden hittills av ett filament från denna kosmiska väv, som är en del av universums storskaliga struktur. Filamentet avbildades med ESO:s Very Large Telescope (VLT) och visas här i lila, överlagrad på en bakgrundsbild tagen med NASA/ESA rymdteleskop Hubble. Strukturen består av gas som dras ihop av mörk materia. Den sträcker sig 3 miljoner ljusår och förbinder två avlägsna galaxer i det tidiga universum.
Omkring 85 % av all materia i universum är faktiskt mörk materia. Mörk materia är osynlig, men gasen runt omkring är det inte. Denna gas lyser dock extremt svagt, vilket gör dessa strukturer mycket svåra att observera. Men efter cirka 150 timmars observationer lyckades en grupp astronomer under ledning av Davide Tornotti, doktorand vid universitetet i Milano-Bicocca i Italien, ta denna skarpa bild av ett kosmiskt filament. Detta var möjligt tack vare MUSE-instrumentets extremt höga känslighet, och instrumentet har därför blivit något av en arbetshäst för att avbilda den kosmiska väven.
Ljuset från filamentet tog 11 miljarder år att nå oss och ser exakt ut som teorin förutsade. I det tidiga universum kunde filament av mörk materia skapa en stor väv som drog till sig gas genom sin gravitationskraft. I skärningspunkterna mellan filamenten bidrog den med det material som behövs för att bilda galaxer. Vilka fångster kommer vi att hitta i detta mörka nät när vi undersöker fler av de mystiska filamenten?
Länkar
Källa:ESO/D. Tornotti et al./Hubble: M. Revalski, P. Francis et al.
Om bilden
| ID: | potw2504a |
| Språk: | sv |
| Typ: | Observation |
| Publiceringsdatum: | 29 januari 2025 11:00 |
| Storlek: | 1945 x 1915 px |
Om objektet
| Typ: | Early Universe : Cosmology : Morphology : Large-Scale Structure Early Universe : Cosmology : Phenomenon : Dark Matter |
| Constellation: | Grus |
Skrivbordsunderlägg
Koordinater
| Position (RA): | 21 42 25.54 |
| Position (Dec): | -44° 19' 48.20" |
| Field of view: | 1.95 x 1.92 arcminutes |
| Orientering: | Nord är 35.4° vänster om lodrätt |
Färger och filter
| Band | Våglängd | Teleskop |
|---|---|---|
| Synligt ljus Ly-alpha (redshifted) | 513 nm | Very Large Telescope MUSE |
| Ultraviolett F336W | 335 nm | Hubble Space Telescope WFC3 |
| Synligt ljus F450W | 448 nm | Hubble Space Telescope WFPC2 |
| Synligt ljus F702W | 681 nm | Hubble Space Telescope WFPC2 |
| Infrarött F125W+F140W | 1.3 μm | Hubble Space Telescope WFC3 |
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