The ionized gas in the galactic center

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Scientific paper

This paper reviews recent observations and interpretations of the structure and kinematics of the ionized gas within 2 parsecs of the galactic center. The ionized gas exists largely within several arm-like features, each of which contains a great deal of internal structure. Two of the arms lie on the inside edge of the rotating ring of neutral material at a radius of 2 pc and take part in that rotation. Two other features, the northern arm and the bar, pass much closer to the center. Their kinematics are not as well understood, although the northern arm appears to define a trajectory of infall towards th IRS 16/Sgr A* complex. A small, but spatially extended region of high velocity gas is found at the location of the above complex. This gas is probably undergoing radial motion and apparently is distant (~0.05 pc) from the source of its motion; it may be the interface between gas in the bar and an as yet undetected outflowing wind from an active source in the nucleus.

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