{"id":10129,"date":"2019-03-22T17:15:47","date_gmt":"2019-03-22T17:15:47","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=10129"},"modified":"2019-04-02T16:29:39","modified_gmt":"2019-04-02T16:29:39","slug":"zoom-sur-messier-61-une-magnifique-galaxie-spirale","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/03\/22\/zoom-sur-messier-61-une-magnifique-galaxie-spirale\/","title":{"rendered":"Zoom sur Messier 61, une magnifique galaxie spirale"},"content":{"rendered":"

Vue de face, la galaxie Messier 61 nous offre un spectacle saisissant dans le grand t\u00e9lescope de l’Observatoire Europ\u00e9en Austral (ESO).<\/strong><\/p>\n

Les astronomes connaissent bien l\u2019amas de la Vierge, une concentration de plus de 1.500 galaxies assez proches de nous (entre 50 et 70 millions d\u2019ann\u00e9es-lumi\u00e8re) qui fut d\u00e9couverte par Charles Messier \u00e0 la fin du XVIIIe si\u00e8cle. Cet astronome fran\u00e7ais classa les 16 plus brillantes de ces galaxies dans son c\u00e9l\u00e8bre catalogue<\/a>, dont la fameuse galaxie du Sombrero, M 104<\/a>. Attardons-nous sur l’une d’entre elles, la superbe galaxie spirale Messier 61 situ\u00e9e \u00e0 55 millions d’ann\u00e9es-lumi\u00e8re de nous.<\/p>\n

\"\"<\/a>
Messier 61 est une galaxie spirale situ\u00e9e dans la constellation de la Vierge. \u00a9 ESO<\/figcaption><\/figure>\n

Si elle est assez discr\u00e8te dans un t\u00e9lescope d’amateur avec une magnitude<\/a> de 10, la galaxie M 61 r\u00e9v\u00e8le toute sa beaut\u00e9 dans un grand instrument, comme nous le prouve cette image propos\u00e9e par l’ESO<\/a>.<\/p>\n

L’histoire de la d\u00e9couverte de cette galaxie est amusante : elle fut observ\u00e9e pour la premi\u00e8re fois ind\u00e9pendamment la nuit du 5 mai 1779 par l’astronome italien Barnaba Oriani et le fran\u00e7ais Charles Messier, mais ce dernier pensa qu’il s’agissait d’une com\u00e8te. C’est donc Oriani qui fut cr\u00e9dit\u00e9 de la d\u00e9couverte.<\/p>\n

\"\"<\/a>
Emplacement de la galaxie Messier 61 au sein de la constellation de la Vierge.<\/figcaption><\/figure>\n

Messier 61 fait partie de la famille des\u00a0\u00a0galaxies\u00a0starbust<\/em>, des galaxies qui\u00a0connaissent un taux incroyablement \u00e9lev\u00e9 de formation d’\u00e9toiles, \u00e9puisant leur r\u00e9servoir de gaz en tr\u00e8s peu de temps (\u00e0 l’\u00e9chelle astronomique). Mais ce n’est pas la seule activit\u00e9 en cours dans M 61 ; les astronomes ont d\u00e9tect\u00e9 une source de rayons X trahissant la pr\u00e9sence d’un trou noir supermassif en son centre. Messier 61 d\u00e9tient \u00e9galement le record du nombre de supernovas observ\u00e9es dans les galaxies du catalogue Messier avec sept candidates.<\/p>\n","protected":false},"excerpt":{"rendered":"

Vue de face, la galaxie Messier 61 nous offre un spectacle saisissant dans le grand t\u00e9lescope de l’Observatoire Europ\u00e9en Austral (ESO). Les astronomes connaissent bien l\u2019amas de la Vierge, une concentration de plus de 1.500 galaxies assez proches de nous (entre 50 et 70 millions d\u2019ann\u00e9es-lumi\u00e8re) qui fut d\u00e9couverte par Charles Messier \u00e0 la fin … Continuer la lecture de Zoom sur Messier 61, une magnifique galaxie spirale<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":10130,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[113,633,2626],"class_list":["post-10129","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-constellation-de-la-vierge","tag-eso","tag-messier-61"],"yoast_head":"\nZoom sur Messier 61, une magnifique galaxie spirale<\/title>\n<meta name=\"description\" content=\"Vue de face, la galaxie Messier 61 nous offre un spectacle saisissant dans le grand 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