Environnement des couples serrés : disques et jets connexion accrétion-éjection

Astronomy and Astrophysics – Astrophysics

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Jets and collimated winds are found in many classes of astrophysical objects, from young stars to AGNs. Galactic binaries often exhibit such characteristics, whatever the nature of their primary (white dwarf, neutron star or black hole). Multiwavelength observations of these sources have already given us some clues on the links between accretion and ejection. It is now recognized that potential wells and and accretion discs are required to produce jets, but the physical mechanisms responsible for mass ejection and collimation of jets are still a matter of debate. Des jets ou vents collimatés ont été mis en évidence dans de nombreuses classes d'objets astrophysiques allant des étoiles jeunes aux AGN. Les binaires galactiques montrent fréquemment ce phénomène, que l'objet compact soit une naine blanche, une étoile à neutron ou un trou noir. L'observation multi-longueur d'onde de certaines de ces sources permet de commencer à mieux comprendre les liens unissant accrétion et éjection. Bien que certains ingrédients tels qu'un puits de potentiel gravitationnel et un disque d'accrétion soient universellement nécessaires à la production des jets, l'origine physique de l'éjection et de la collimation reste encore débattue.

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