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Fig. 3


OH absorption of the OH-streamer head at 1667 MHz, observed with the VLA in BnA configuration at an angular resolution of (Karlsson et al. 2003) overlaid on the 18 cm continuum. We note the location of the central parts of Sgr A West in dark shades of grey. Sgr A is labelled with a plus sign, and each panel covers a region of about . The lowest contour level corresponds to about 4σ, and the velocity is given in the left-hand lower corner in each panel. Note the winglike appearance of the head, marked by an arrow, and its anti-clockwise rotation as the velocity decreases from 50 to 24  km s-1.

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