guestaroni wrote: ↑Wed Jul 06, 2022 6:33 pm
I think these images would be much easier for the layperson to understand if they could be shown with a 360° viewer, with the image projected on the inside of a sphere, and the viewpoint at the center of the sphere. Is this a valid idea? Does anyone know of where this can be found?
I am not happy with the posted infographics, too.
White lines trace the tangential movement of 26 million stars in the nearest part of the galaxy, that's ok.
Background fill colors should show the radial velocities of that stars, should they not?
So off with the Large and Small Magellanic Clouds and field globular clusters, that's ok.
But why leave the two spots that white lines have to cross near the center of the map and that are supposed to correlate with the Milky Way's bar?
All those two spots do is messing with the map of the stellar flows.
Now what did I expect before I get to see this map?
Some stars must follow some path passing by Sun; half of the path would be with radial velocity component of coming closer towards Sun and the other half of the path would be populated with red-shifted stars.
Particularly, a lower galaxy orbit would make a path of stars orbiting a little faster than Sun (though the dark matter halo make Sun's galactic orbital velocity almost equal to a lower orbit's one). A higher orbit makes for a path in the other direction. Sun's bias toward the Northern surface of the galactic disk should make the two flows look a little lower than the galactic equator; each flow should span almost 180° horizontally.
I don't think this is what I see. I can see a 180° flow crossing the galactic center in the background; that should be the lower orbit flow.
If it orbits at a higher velocity than Sun, then the galactic core is paradoxially doing the opposite thing: spinning slower than Sun.
As for the higher orbit's flow the map is quite unfriendly and I just can't see any heads or tails.
Just how unfriendly a 360° map can be is illustrated here
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