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Paper: Structure and Dynamics of the Milky Way: The Evolving Picture
Volume: 438, The Dynamic Interstellar Medium: A Celebration of the Canadian Galactic Plane Survey
Page: 16
Authors: Foster, T.; Cooper, B.
Abstract: From the inception of radio astronomy, the study of the Interstellar Medium has been both aided and frustrated by one fact: we are right within it! Our embedded perspective is favourable to observing kinematic and structural details that are likely to remain inaccessible in external galaxies for some time, but not so to gaining a birds-eye view of our Galaxy's structure and motions on the largest scales. The Canadian Galactic Plane Survey (CGPS) is the original survey with the ability to image both details and the “big picture.” We will broadly review what is known of the Milky Way, and focus on large-scale ISM structure and dynamics that the CGPS and immediate family of surveys depict particularly well (e.g. spiral structure, the rotation curve, density waves, rolling motions, the warp & scalloping). We also highlight areas where puzzles still exist (e.g. outer spiral structure, the question of shocks and rolling motions in the Milky Way), and offer some new insights (e.g. multiple shocks in the second quadrant; a radially varying spiral pattern speed in the disc) that demonstrate what is possible with current and future high-resolution 21 cm surveys.
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