Fig. 2
From: Measuring the ionisation fraction in a jet from a massive protostar
Position–velocity diagram of the G35.2–0.74N protostellar jet. a HST [Fe II]−H image oriented in the slit position (green lines, PA = −14.7°), north and east are recorded in the top-left corner of the figure, the central source is indicated with a red star, and the flux values are indicated in the colour bar to the right. b ISAAC spectral image of the [Fe II] line at 1.644 μm. c ISAAC spectral image of the [Fe II] line at 1.664 μm. d ISAAC spectral image of the [Fe II] line at 1.677 μm. e ISAAC spectral image of the Brγ line at 2.166 μm. f ISAAC spectral image of the H2 line at 2.121 μm (1 − 0 S(1)). The red contours represent the intensity in the spectral images and are from 3σ to 40σ in steps of 3σ. The horizontal blue dashed lines indicate the position 0″ in the Y Offset while the vertical blue dashed lines indicate the position of 0 km −1 in panels (b–f)
