Fotometria dell'ammasso aperto NGC 2420 e dell’ammasso globulare NGC 6229
Storskalig struktur - Karlstad University · 2017. 11. 8. · S KUG 1258+278 KUG 00m 1257 +27B e...
Transcript of Storskalig struktur - Karlstad University · 2017. 11. 8. · S KUG 1258+278 KUG 00m 1257 +27B e...
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Storskalig struktur Vad finns det som är större än galaxer? • Galaxgrupp (upp till 50)
• Galaxhop (“kluster”, upp till tusental) [1980-tal: slut här]
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Den lokala (galax)gruppen
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Mitten på den irreguljära Virgohopen, över 2000 galaxer totalt, ca 50 miljoner ljusår bort
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Den reguljära Comahopen (antagligen ca 10.000 galaxer), ca 300 miljoner ljusår bort
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Storskalig struktur Vad finns det som är större än galaxer? • Galaxgrupp (upp till 50)
• Galaxhop (“kluster”, upp till tusental)
• Superhop (dussintals hopar, upp till 150 miljoner ljusårs storlek)
• Filament/väggar/tomrum
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De närmaste superhoparna (Virgosuperhopen = lokala superhopen = Virgohopen + lokala hopen)
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Lanieakea
Definierad i september 2014. R. Brent Tully, University of Hawaii, Hélène Courtois, University of Lyon; definition av superhopar baserad på galaxers relativa hastigheter. 100,000 galaxer, 520 millioner ljusårs storlek, 1017 𝑀𝑀⨀ 4 delar: • Virgo superhopen • Hydra-Centaurus superhopen
Great Attractor, Laniakea centrala gravitationspunkt nära Norma Antlia väggen = Hydra superhopen Centaurus superhopen
• Pavo-Indus superhopen • Södra superhopen, inkluderande Fornaxhopen, Dorado och Eridanus
molnen/hoparna.
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Fördelning av superhopar i filament och tomrum (voids), flera hundra miljoner ljusår stora strukturer
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Galaxkollisioner
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Mörk materia
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Galaxformation
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Ingen gas kvar för att forma en skiva