Cromodinamica galatttica
Quest’immagine piena di colori assomiglia ad una pittura astratta, o forse ad una vetrata colorata contemporanea. In realtà si tratta di una vista inusuale di una galassia ripresa con il nuovo strumento MUSE sul Very Large Telescope di ESO.
I colori nelle foto astronomiche corrispondono di solito ai veri colori dell’oggetto. In quest’immagine tuttavia i colori rappresentano il moto delle stelle che formano la galassia ellittica gigante Messier 87 - una delle galassie più brillanti nell'ammasso della Vergine che si trova a circa 50 milioni di anni-luce da noi.
Il rosso nell’immagine indica che le stelle in questa parte dell’oggetto mediamente si stano allontanando da noi, mentre blu significa che le stelle si stano avvicinando a noi; giallo e verde corrispondono a situazioni intermedie.
Questa nuova mappa di Messier 87 mostra il movimento delle stelle più chiaramente di quanto non sia mai stato fatto in passato. Essa svela una lenta rotazione di questo oggetto massivo - la parte in alto a sinistra (in blu) si avvicina a noi mentre la parte a destra in basso (in rosso) si allontana. L'immagine rivela anche caratteristiche inaspettate - per esempio l’inversione di colori al centro dell’immagine, con colori vicine al blu nella parte cetrale inferiore e giallo-arancione nella parte centrale superiore, che suggerisce che Messier 87 potrebbe aver avuto un passato più drammatico di quanto si pensasse precedentemente, e che potrebbe quindi essere il risultato di una collisione di varie galassie.
Una pubblicazione che discute queste osservazioni è stato pubblicato dal team condotto da Eric Emsellem, ESO Head of the Office for Science, nelle lettere di Monthly Notices of the Royal Astronomical Society.
Link
Crediti:Eric Emsellem/ESO
Riguardo l'immagine
| Identificazione: | potw1441a |
| Lingua: | it-ch |
| Tipo: | Osservazione |
| Data di rilascio: | Lunedì 13 Ottobre 2014 10:00 |
| Grandezza: | 1149 x 1152 px |
Riguardo all'oggetto
| Nome: | Messier 87, MUSE, Very Large Telescope |
| Tipo: | Local Universe : Galaxy : Type : Elliptical Unspecified : Technology : Observatory : Instrument |
Formati delle immagini
Colori e filtri
| Banda | Telescopio |
|---|---|
| Ottico | Very Large Telescope MUSE |
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