Braccio del Cigno

Schema della Via Lattea conosciuta; il Braccio Regolo-Cigno è indicato in viola.

Il Braccio del Cigno (noto anche come Braccio Regolo-Cigno) è uno dei bracci di spirale più importanti della nostra galassia, la Via Lattea.

Caratteristiche

Si origina in un punto del bulge che ricade probabilmente in direzione della costellazione dell'Aquila, dunque dal "nostro" lato della Galassia, e gira internamente in direzione del Regolo, passando tra noi ed il centro galattico; in questo tratto, ben visibile e ricco di oggetti, viene spesso chiamato "Braccio del Regolo"[1]. Prosegue dietro il centro galattico, nel cosiddetto "cono d'ombra", inosservabile dalla nostra posizione a causa della presenza del nucleo galattico, e riprende ad essere visibile in direzione del Cigno.
Il braccio prosegue ulteriormente, in direzione di Cefeo, Cassiopea ed oltre; in questo tratto costituisce l'estremo braccio esterno della Via Lattea, al punto che viene chiamato "Braccio Esterno"[1].
Una struttura ancora più esterna e probabilmente riconducibile al Braccio Regolo-Cigno è stata scoperta in direzione delle Vele e della Carena, e viene chiamata "Nuovo Braccio Esterno".

Note

  1. ^ a b (EN) Ed Churchwell, Brian L. Babler e Marilyn R. Meade, The Spitzer /GLIMPSE Surveys: A New View of the Milky Way, in Publications of the Astronomical Society of the Pacific, vol. 121, n. 877, 1º marzo 2009, pp. 213–230, DOI:10.1086/597811. URL consultato il 22 marzo 2016.
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