- #1

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For simplicity assume an [x y z] coordinate system with the origin in the center of the galaxy and [x y] representing the plane of rotation. At any point [x y z] there is a corresponding velocity vector [v

_{x}v

_{y}v

_{z}] representing the motion of matter at that point. For objects in a galactic plane (that is: z near 0), the expectation is that v

_{z}is near 0 and the vector [v

_{x}v

_{y}] is at right angles to the radius vector to [x y]. A difference from the expectation is said to be peculiar motion.

I imagine a display of this data as a galactic-shaped 3D graph with an arrow at each sample point. I imagine the data base describing this data as a table with six columns [x y x v

_{x}v

_{y}v

_{z}] or perhaps something similar using spherical coordinates. A science librarian and a cosmologist have said they do not know of any such dataset. Please note the considerable elaboration of this request as contrasted to merely speed as a function of radial distance from the center.