Additions:
""The Galaxy Rotation Curve""
""The Gradient of the Rotation Curve""
""Conflict with CDM and MOND""
"" In a study of the velocity distribution of local stars, Erik Anderson and I found that very few stars follow circular orbits. By indentifying stars close to apsis (points at the greatest and least distance of their orbits from the galactic centre) we were able to trace the circular speed curve in the solar neighbourhood. With the available stellar data it is only possible to calculate the slope of rotation curve over a short distance. With a little bit of analysis, we found a gradient agreeing with that found from carbon monoxide and atomic hydrogen. The method we used will become more valuable when data from Gaia becomes available. It will be potentially be possible to extend the analysis to a much larger region of space, perhaps even to trace the circular speed curve to near the centre of the Galaxy, and a similar distance outward from the Sun where current methods are problematic. |
""
Deletions:
""| In a study of the velocity distribution of local stars, Erik Anderson and I found that very few stars follow circular orbits. By indentifying stars close to apsis (points at the greatest and least distance of their orbits from the galactic centre) we were able to trace the circular speed curve in the solar neighbourhood. With the available stellar data it is only possible to calculate the slope of rotation curve over a short distance. With a little bit of analysis, we found a gradient agreeing with that found from carbon monoxide and atomic hydrogen. The method we used will become more valuable when data from Gaia becomes available. It will be potentially be possible to extend the analysis to a much larger region of space, perhaps even to trace the circular speed curve to near the centre of the Galaxy, and a similar distance outward from the Sun where current methods are problematic. |
""
