Image Details
Caption: Figure 7.
We present the NF positions of our cataloged clouds against four different 3D orbital models in PPV space plotted over spectral decomposition of MOPRA HNCO data from J. D. Henshaw et al. (2016b; gray background points). The models include the median fitted ellipse from this work (top left); two spiral arms similar to those proposed by Y. Sofue (1995; top right); open streams based off of an open x2 orbit from J. M. D. Kruijssen et al. (2015; bottom left); and a closed x2 orbit that assumes a constant orbital velocity, proposed by S. Molinari et al. (2011; bottom right). Markers are the same as those presented in Figure 5. Blue and red colors indicate likely near or far positions, respectively. The black star denotes the position of SgrA⋆.
© 2026. The Author(s). Published by the American Astronomical Society.