{"id":7092,"date":"2018-04-01T07:47:20","date_gmt":"2018-04-01T06:47:20","guid":{"rendered":"http:\/\/outters.fr\/?p=7092"},"modified":"2025-07-15T17:04:09","modified_gmt":"2025-07-15T16:04:09","slug":"m83-lhargb","status":"publish","type":"post","link":"https:\/\/www.outters.fr\/?p=7092","title":{"rendered":"M83-LHargb (Ciel Austral)"},"content":{"rendered":"

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M83 en Lha-rgb
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Donn\u00e9es techniques
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Donn\u00e9es scientifiques<\/h2><\/div>
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M83 a \u00e9t\u00e9 catalogu\u00e9e comme interm\u00e9diaire entre galaxie normale et galaxie barr\u00e9e par G\u00e9rard de Vaucouleurs<\/a>, soit SAB(s)c dans sa classification<\/a>. Elle poss\u00e8de des bras spiraux bien marqu\u00e9s qui lui donnent une forte impression de mouvement. La coloration de ses n\u0153uds est bleue ou rouge.<\/p>\n

Lorsqu’ils sont rouges, ces n\u0153uds sont apparemment des r\u00e9gions HII<\/a>, n\u00e9buleuses gazeuses diffuses, \u00e0 l’int\u00e9rieur desquelles la formation stellaire<\/a> est juste en train de s’amorcer, et dont le rayonnement<\/a> lumineux est d\u00fb au gaz ionis\u00e9<\/a> par quelques nouvelles \u00e9toiles<\/a> tr\u00e8s chaudes.<\/p>\n

Les r\u00e9gions bleut\u00e9es correspondent \u00e0 une population d’\u00e9toiles existantes, mais r\u00e9cemment form\u00e9es (c’est-\u00e0-dire entre quelques millions et quelques dizaines de millions d’ann\u00e9es). Les bandes de poussi\u00e8re peuvent \u00eatre distingu\u00e9es tr\u00e8s \u00e0 l’int\u00e9rieur de la r\u00e9gion centrale, dont le diam\u00e8tre n’est que de 20″.<\/p>\n

Son noyau pr\u00e9sente de fortes raies d’\u00e9mission<\/a>. Il est compos\u00e9 d’\u00e9toiles jaunes plus \u00e2g\u00e9es, population dominante dans la r\u00e9gion centrale et s’\u00e9tendant le long de la structure en forme de barre.<\/p>\n

M83 est l’un des fleurons du ciel profond<\/a> austral, mais difficile \u00e0 observer dans l’h\u00e9misph\u00e8re nord<\/a>. Pendant plusieurs ann\u00e9es, M83 a \u00e9t\u00e9 la galaxie la plus riche en d\u00e9couvertes de supernov\u00e6<\/a>.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
M83
\nGalaxie du Moulinet austral<\/td>\n<\/tr>\n
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Donn\u00e9es d\u2019observation
\n(\u00c9poque<\/a> J2000.0<\/a>)<\/small><\/th>\n<\/tr>\n
Constellation<\/a><\/th>\nHydre<\/a><\/td>\n<\/tr>\n
Ascension droite<\/a> (\u03b1)<\/th>\n13h<\/sup>\u00a037m<\/sup>\u00a000,78s<\/sup><\/td>\n<\/tr>\n
D\u00e9clinaison<\/a> (\u03b4)<\/th>\n\u221229\u00b0\u00a051\u2032\u00a058,6\u2033<\/td>\n<\/tr>\n
Distance<\/th>\nenviron\u00a04,57 Mpc<\/a><\/abbr><\/span> (\u223c14,9 millions\u00a0d’a.l.<\/a><\/abbr><\/span>)1<\/a><\/sup><\/td>\n<\/tr>\n
Magnitude apparente<\/a> (V)<\/small><\/th>\n7,6<\/td>\n<\/tr>\n
Dimensions apparentes (V)<\/small><\/th>\n11×10 minutes d’arc<\/td>\n<\/tr>\n
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Caract\u00e9ristiques physiques<\/th>\n<\/tr>\n
Type d’objet<\/th>\nGalaxie<\/a><\/td>\n<\/tr>\n
Type de galaxie<\/a><\/th>\nSpirale interm\u00e9diaire SABc<\/td>\n<\/tr>\n
Masse<\/a><\/th>\n?\u00a0M<\/i>\u2609<\/sub><\/a><\/td>\n<\/tr>\n
Dimensions<\/th>\n?
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Couleur (B-V)<\/small><\/th>\n?<\/td>\n<\/tr>\n
D\u00e9couverte<\/th>\n<\/tr>\n
D\u00e9couvreur(s)<\/th>\nNicolas Louis de la Caille<\/a><\/td>\n<\/tr>\n
Date<\/th>\n1751<\/a><\/td>\n<\/tr>\n
D\u00e9signation(s)<\/th>\nM83, NGC 5236, Galaxie au milles rubis<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div><\/div><\/div>
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Commentaires sur l'objet<\/h2><\/div>
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M83 est une galaxie magnifique, le traitement a consist\u00e9 \u00e0 faire apparaitre le halo qui entoure la galaxie et ajouter la couche Halpha qui donne un plus \u00e0 l’image. Cette couleur ros\u00e9 au centre est donn\u00e9e par l’ajout de la couche Halpha.<\/p>\n

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Couche Halpha<\/p><\/div>\n<\/div><\/div><\/div>

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Image LHargb<\/h2><\/a><\/div><\/div><\/div>
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Image Halpha<\/h2><\/a><\/div><\/div><\/div>
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