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Fig. 3

image

ALMA H13CN (J = 4–3) and IRTF [Ne II]12.8 μm velocity channel maps from vLSR = −150 to +150 km s−1 in steps of 10 km s−1. The two top left panels show H13CN (J = 4–3) and [Ne II]12.8 μm total integrated line intensity maps. White curves in the H13CN (J = 4–3) map represent a CND model bounded by two rotating circular rings (with i = 66°, θ = 23°) with inner and outer deprojected radii of 1.5 and 2.3 pc respectively. Gray curves in the [Ne II]12.8 μm map represent Keplerian elliptical orbits proposed to fit the motion of the ionized gas streamers (Zhao et al. 2009). The other panels show individual H13CN velocity channel maps (for intensities between 0 and 20 K km s−1 in linear scale) with the specific velocity interval [v, v + 10] displayed at each corner. The ionized gas emission in the mini-spiral is shown in magenta contours (from Irons et al. 2012). Sgr A* is at position (0″, 0″) and is displayed with a white dot.

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