Sombrerogalaxen

Sombrerogalaxen
En tydlig bild på M104, som är tagen med Rymdteleskopet Hubble.
Observationsdata
StjärnbildJungfrun
Rektascension12t 39m 59,4s
Deklination−11° 37′ 23″
Rödförskjutning0,003416 ± 0,000017 km/s
Avstånd29,3 ± 1,6 miljoner ljusår
TypSA(s)a; LINER
Skenbar magnitud8,98
Upptäckt
Upptäcktsår9 april 1781
UpptäckareCharles Messier
Andra beteckningar
M 104, NGC 4594, UGC 293, PGC 42407, MCG -02-32-020, IRAS 12373-1120, GC 3132, h 1376, H 1.43
Se även: Galaxer, Lista över galaxer
En infraröd bild på Sombrerogalaxen.

Sombrerogalaxen, M104 i Messiers katalog, även katalogiserad som NGC 4594, är en spiralgalax med en massa som motsvarar 800 miljarder solar. Den utbuktande lysande kärnan, det centrala supermassiva svarta hålet och det mörka stoftbandet gör att galaxen ständigt drar till sig astronomers intresse.

Galaxen fick sitt namn på grund av den stora utbuktande kärnan, som rymmer över 2 000 klotformiga stjärnhopar - tio gånger fler än vad som finns i vår galax, samt de mörka gasfälten som ses från kanten i galaxens skiva.

Centralt supermassivt svart hål

Under 1990-talet påvisade ett forskarlag under John Kormendys ledning att ett supermassivt svart hål finns inne i Sombrerogalaxen. Genom spektroskopiska data från både CFHT och Hubbleteleskopet visade gruppen att rotationshastigheten hos stjärnorna i galaxens centrum inte kunde vara så hög, om inte en massa motsvarande 1 miljard gånger Solens massa fanns i centrum. Hålet i Sombrerogalaxen är ett av de mest massiva som upptäckts i samtliga närliggande galaxer.

Observation

Sombrerogalaxen finns mellan stjärnbilderna Jungfrun och Korpen. Galaxen har en skenbar magnitud på +9,0, vilket gör att det inte är helt omöjligt att upptäcka M104 med en fältkikare under goda förhållanden. Lättare är naturligtvis att se den med ett teleskop.

Externa länkar

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Se även: Klotformig stjärnhop · Stjärnbild · Galax · Nebulosa
   NGC 4592  •  NGC 4593  •  NGC 4594  •  NGC 4595  •  NGC 4596   

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