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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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