Cambiamenti nella nebulosa anello attorno a SN 1987A
Quest’immagine elaborata al computer è una media di due esposizioni di 15 minuti, ottenute nella luce dell'azoto ionizzato durante la mattina del 20 dicembre 1993, con il Super Seeing Instrument (SuSI) al New Technology Telescope da 3,58 m dell’ ESO.
Essa mostra la complessa struttura delle deboli nebulose intorno a SN 1987A nella Grande Nube di Magellano. L'anello interno è stato formato dall'interazione con la materia espulsa durante una fase precedente dalla stella che successivamente è esplosa come supernova. Spettri e modelli teorici suggeriscono che i deboli anelli nebulari esterni tracciano il bordo esterno di una grande bolla che è stata formata dalla materia esplulsa. La supernova stessa, al centro dell'anello interno, emette pochissima luce nella stretta banda spettrale usata per questa osservazione e non è visibile in questa immagine.
A causa dell’ampio intervallo d’intensità in queste nebulosità e per mostrare meglio la struttura, le intensità delle parti a bassa luminosità superficiale dell'immagine sono state notevolmente migliorate, in relazione alle parti più luminose.
La maggior parte della luce proveniente dall'anello interno è concentrata in una banda stretta e luminosa a cui è stata data relativamente poca prominenza in quest’immagine modificata. Tuttavia la struttura irregolare, in particolare la maggiore intensità nel Nord-Ovest (in alto a destra), è chiaramente visibile. Quest’immagine mostra strutture molto deboli e quindi una larghezza complessiva maggiore della larghezza dell’anello rispetto alle immagini precedenti.
La risoluzione nominale di questa immagine determinata dalla dimensione delle immagini stellari nel campo è di 0.20 secondi d'arco. Lo spazio nel quadrante in alto a destra dell'anello esterno è un artefatto causato dalla sottrazione di una stella luminosa in questa posizione. La dimensione del pixel è 0,032 arcsec.
Crediti:
ESO
A proposito dell'immagine
| Identificazione: | eso9401a |
| Lingua: | it |
| Tipo: | Osservazione |
| Data di pubblicazione: | 27 Gennaio 1994 |
| Notizie relative: | eso9401 |
| Dimensione: | 3030 x 2128 px |
A proposito delll'oggetto
Formati delle immagini
Colori e filtri
| Banda | Telescopio |
|---|---|
| Ottico NII | New Technology Telescope EMMI |
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