{"id":7423,"date":"2018-06-04T15:18:45","date_gmt":"2018-06-04T14:18:45","guid":{"rendered":"http:\/\/outters.fr\/?p=7423"},"modified":"2025-07-15T17:04:09","modified_gmt":"2025-07-15T16:04:09","slug":"ngc4038-lrgb-ciel-austral","status":"publish","type":"post","link":"https:\/\/www.outters.fr\/?p=7423","title":{"rendered":"ngc4038-Lrgb (Ciel Austral)"},"content":{"rendered":"

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ngc4038-Lrgb (Ciel Austral)
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\"ngc4038\"<\/a><\/span><\/div>
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Donn\u00e9es techniques
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Donn\u00e9es scientifiques<\/h2><\/div>
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SOURCE WIKIPEDIA<\/p>\n

Les galaxies des Antennes sont l’objet d’une collision galactique. Situ\u00e9es dans le groupe de NGC 4038<\/a> avec 5 autres galaxies, ces deux-l\u00e0 sont connues sous le nom d’\u00ab\u00a0Antennes\u00a0\u00bb parce que les deux grandes excroissances form\u00e9es d’\u00e9toiles<\/a> de gaz<\/a> et de poussi\u00e8res<\/a> \u00e9ject\u00e9s hors de leur galaxie lors de la collision ressemblent aux antennes<\/a> d’un insecte<\/a>. Les noyaux<\/a> des deux galaxies sont en train de fusionner et de devenir une supergalaxie unique. Cela arrivera probablement aussi \u00e0 la Voie lact\u00e9e<\/a> lorsqu’elle entrera en collision avec la galaxie d’Androm\u00e8de<\/a>. Deux supernovas<\/a> ont \u00e9t\u00e9 d\u00e9couvertes dans la galaxie\u00a0: SN 2004gt et SN 2007sr1<\/a><\/sup>.<\/p>\n

Chronologie<\/span><\/h2>\n

Il y a environ 1,2 milliard d’ann\u00e9es, NGC 4038 et NGC 4039 \u00e9taient deux galaxies s\u00e9par\u00e9es. NGC 4038 \u00e9tait une galaxie spirale<\/a>, et NGC 4039 une galaxie spirale barr\u00e9e<\/a>. Avant que les galaxies n’entrent en collision, NGC 4039 \u00e9tait la plus grande des deux. Il y a 900 millions d’ann\u00e9es, elles ont commenc\u00e9 \u00e0 s’approcher, leur aspect \u00e9tait alors similaire \u00e0 celui qu’a NGC 2207<\/a> de nos jours. Il y a 600 millions d’ann\u00e9es, les galaxies des antennes se travers\u00e8rent l’une l’autre, ressemblant \u00e0 NGC 4676<\/a>. Il y a 300 millions d’ann\u00e9es, de la mati\u00e8re \u00e9tait \u00e9ject\u00e9e des deux galaxies. De nos jours, c’est ladite mati\u00e8re qui forme ces fameuses antennes.<\/p>\n

Dans environ 400 millions d’ann\u00e9es, les noyaux galactiques entreront en collision, devenant un noyau simple entour\u00e9 d’\u00e9toiles, de gaz et de poussi\u00e8re. Certaines observations et simulations sugg\u00e8rent que ces galaxies fusionneront \u00e9ventuellement en galaxie elliptique<\/a>2<\/a><\/sup>.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
D\u00e9couvreur<\/th>\nWilliam Herschel<\/a><\/td>\n<\/tr>\n
Date de d\u00e9couverte<\/th>\n1785<\/a><\/td>\n<\/tr>\n
Autres d\u00e9signations<\/th>\nRingtail Galaxy<\/i> (anglais),
\nNGC<\/a> 4038 \/ 4039,
\nPGC<\/a> 37967 \/ 37969, Arp 244<\/td>\n<\/tr>\n
Donn\u00e9es d\u2019observation – \u00c9poque<\/a> J2000.0<\/a><\/small><\/th>\n<\/tr>\n
Ascension droite<\/a><\/th>\n12h<\/sup>\u00a001m<\/sup>\u00a053,0s<\/sup><\/td>\n<\/tr>\n
D\u00e9clinaison<\/a><\/th>\n\u221218\u00b0\u00a052\u2032\u00a010\u2033<\/td>\n<\/tr>\n
Coordonn\u00e9es galactiques<\/a><\/th>\n<\/td>\n<\/tr>\n
Constellation<\/a><\/th>\nCorbeau<\/a><\/td>\n<\/tr>\n
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Autres caract\u00e9ristiques<\/th>\n<\/tr>\n
Vitesse radiale<\/a><\/th>\n1642 \u00b1 12 \/ 1641 \u00b1 9 km<\/a>\/s<\/a><\/td>\n<\/tr>\n
Magnitude apparente<\/a> (V<\/i>)<\/th>\n11.2 \/ 11.1<\/td>\n<\/tr>\n
Type<\/a><\/th>\nSB(s)m pec<\/a> \/ SA(s)m pec
\nGalaxies en interaction<\/a><\/td>\n<\/tr>\n
Magnitude absolue<\/a> (V<\/i>)<\/th>\n<\/td>\n<\/tr>\n
Distance<\/th>\n\u223c45\u00a0millions\u00a0d’a.l.<\/a><\/abbr> (\u223c13,8\u00a0Mpc<\/a>)<\/span><\/td>\n<\/tr>\n
Masse<\/a><\/th>\nM\u2299<\/sub><\/a><\/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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Une superbe galaxie qui m\u00e9ritait ce temps de pose.<\/p>\n<\/div><\/div><\/div>

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Image Lrgb<\/h2><\/a><\/div><\/div><\/div>
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