Z CMa - A large-scale high velocity bipolar outflow traced by Herbig-Haro objects and a jet

Astronomy and Astrophysics – Astrophysics

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Herbig-Haro Objects, Light Emission, Plasma Jets, Pre-Main Sequence Stars, Stellar Spectra, Accretion Disks, Forbidden Transitions, H Alpha Line, H Ii Regions, Stellar Luminosity

Scientific paper

A very large-scale and high-velocity bipolar outflow emanating from the luminous FU Orionis star Z CMa is discovered. Its total extent is 3.6 pc and the emitting gas reaches radial velocities of up to -620 km/s. The outflow is traced by a jet and at least 15 Herbig-Haro objects which are approximately aligned along the same axis. Z CMa is so far the most luminous young stellar object for which an optical jet has been reported.

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