You might want to read the paper again, Siggy_G; among other things, the rotation curves the authors use are C09 and C10:Siggy_G wrote:Magnetic fields, and the electric currents that cause them, will affect objects of mass as well. To which degree, would depend on the strength of the magnetic field of the objects, the external magnetic field they're influenced by and the objects' inertial mass. If a bar magnet A is placed on a low-friction surface, and you approach it with another bar magnet B, bar magnet A will be partly or fully pushed or repelled by bar magnet B. Of course, these magnets have a fairly strong magnetic field compared to their mass (and compared to stars' mass/magnetism ratio). If the following (astro)physcisists find it plausible that a magnetic field can affect the stars (and their magnetosphere), especially in the outer region of a galactic disc where gravity declines, then, well, doesn't that explicitelly say that magnetic fields can affect stars dynamically?
Magnetic fields and the outer rotation curve of M3
This conclusion seems very reasonable, as magnetic fields are amplified and act “in situ”, and therefore they become increasingly important at the rim, where gravity becomes weaker. The best-fit model of the magnetic fields requires a field strength slowly decreasing with radius. This slow decrease is compatible with present values of the strength derived from observations of the polarized synchrotron emission of the disc, but clearly we need measurements of Faraday rotation of extragalactic sources at this large radii to confirm that the magnetic field is present up to this distance and to trace unambiguously the regular component. Hence, future experiments such as LOFAR1 and SKA2 (Beck 2009), will be extremely important, allowing a detailed explorations on the galactic edge as well as in the intergalactic medium. This work was partially supported by projects
For those who don't quite know what this means: these rotation curves are not, pace Siggy_G, stellar rotation curves.Ruiz-Granados and Rubiño-Martín wrote:They consist on a set of 98 and 29 measurements of the circular velocity (and their associated error bars) respectively, which were obtained with the high-resolution observations performed with the Synthesis Telescope and the 26-m antenna at the Dominion Radio Astrophysical Observatory (C09) and with the wide-field and high-resolution HI mosaic survey done with the help of the Westerbork Synthesis Radiotelescope and the Robert C. Byrd Green Bank Telescope (GBT) (Braun et al. 2009).
There's more.
As I understand it, in Electric Universe theory, the MHD convention of infinite conductivity is explicitly verboten; yet here's what the authors write, concerning their modelling of the influence of the magnetic field "on the gas distribution" (!): "We assume standard MHD conditions i.e. infinite conductivity."
There's more, but that will do for now.