Fig. 9

Modeled spiral orbits (red segments) over H13CN (J = 4–3) channel maps at typical CND velocities vLSR from −100 to +150 km s−1 (left) and over higher-velocity 12CO (J = 3–2) channel maps (right), both in steps of 50 km s−1. The spirals are nearly circular orbits (i = 66° and θ = 23°) with a small inward radial velocity component (a = −0.06 pc, see text) proposed by Irons et al. (2012) to explain the motion of the ionized gas (shown in green contours) across the northern arm and western arc. Black curves represent a CND model bounded by two rotating circular rings with inner and outer deprojected radii of 1.5 and 2.3 pc respectively. Sgr A* is displayed with a black dot.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.