2007A&A...475..281G

To study the Herbig-Haro flows in the nearby dark globule B335. To find new HH objects and H₂ knots, make a proper motion map of the flow activity and investigate physical properties through shock models. We have observed optical (Hα and [SII]) and near-IR (2.12µm H₂) deep fields and taken optical spectra using the 2.56m Nordic Optical Telescope, as well as a near-UV deep field (U band) using the 3.58m NTT. In addition we present new SPITZER/IRAC (3.5-8.0µm) and MIPS (24µm) observations. We use previous Hα and 2.12µm H₂ observations taken 15 and 9 years earlier to make proper motion maps. We then investigate the shock physics by matching our spectra with planar shock models. We discover five new HH objects (HH119D-H) in the eastern and one (HH119I) in the western lobe of the outflow. From proper motions we find an optically bright, roughly E-W oriented group with high space velocities (200-280km/s) and a near-IR bright, slower group (15-75km/s) moving to the ESE. We also find a system of at least 15 H₂ knots in the western lobe. This (WNW) counterflow suggests the possibility of a binary outflow source, giving rise to two outflow axes with slightly different orientations. We find that the E-W flow is symmetrical with evidence for two outbursts. We make the first detection of [OI] λλ 6300/63 in HH119B and Hβ in HH119A and B and find their extinctions to be A_V≃1.4 and 4.4, respectively. HH119A is found to expand much faster than expected from linear expansion with distance from the outflow source. Using planar shock models we find shock velocities of ∼60km/s (A) and ∼35km/s (B and C). This agrees with A being of higher excitation than B and C. In our U image we detect three of the HH objects and propose that the emission arise from the [OII]λ3728 line and the blue continuum. New SPITZER/IRAC and MIPS observations show most of the HH objects at 4.5µm and a E-W elongated hour-glass shaped structure at the outflow source. Even at 24µm it is not clear whether most of the light is direct or reflected.