Herbig-Haro objects as shocked ambient cloudlets - High-resolution radio observations of HH 7-11

Astronomy and Astrophysics – Astrophysics

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Abundance, Herbig-Haro Objects, Nebulae, Radio Observation, Shock Waves, Formyl Ions, Interferometry, Stellar Winds

Scientific paper

Observations of the region near the objects HH 7-11 were made with the Hat Creek millimeter interferometer. Aperture synthesis maps with 7arcsec-8arcsec resolution of the HCO+(J = 1→0) transition show a striking correlation of the peaks of line intensity with the positions of the optical HH objects. The velocities of the clumps of HCO+ emission are comparable to the systemic velocity of the cloud, implying that the clumps are almost stationary. This coincidence of quiescent almost stationary ambient gas with the fast-moving shock-excited HHs suggests that HH 7-11 are the shocked surfaces of stationary dense ambient cloudlets buffeted by a high-velocity stellar wind.

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