rotation curvesdark matterazimuthal magnetic fieldionized gasgalactic rotationM31THE flat rotation curves of spiral galaxies are usually regarded as the most convincing evidence for dark matter. The assumption
9. FIGURE CAPTIONS 1) Rotation curves of spiral galaxies under the generalized Einstein action. The numbers on the curves indicate the values of a in Eq. (2.23). The prediction of Newtonian theory for a = 2 is also given by a broken curve for comparison. 2) Scale factor of universe as...
However, the implied central face-on opacity of tau = 2-4 for the most luminous galaxies is embarrassingly high compared with studies of edge-on galaxies, which yield central face-on opacities equal to at most t = 1 in the optical band. I show that the controversy can be resolved by ...
•Theextentoftherotationcurvefordi,erentgalaxiesliesintherange 0.45–1.45withmedianvalueequalto0.87ofthestandardradiusofa,atgalaxy. •Severalrotationcurveofedge-ongalaxiesappearsignsoflargeextinc-tionintheplaneofthegalaxyspiralarms,whichisintersectedbythelineofsightatsmallangles. ...
IV.BM 31 and the Rotation Curves of External Galaxies The study of the rotation curve of theAndromeda Galaxy, M 31, the nearestspiral galaxyto ours and one which forms a sort of binary system with theMilky Way, shows that the rotation curve is flat to the distance at which the stars ar...
[1], measurements of the rotation of galaxies have shown that the rotation curves are essentially flat, with an initial steep increase and possible small velocity fluctuations related to spiral structures. The attempts to explain these observations used theoretical models derived on previous rotation ...
tion curves of spiral galaxies,including our Milky Way,are neith er ri gid V (R ) 。( R nor Keplerian (R ) 。( R ¨ 2.The curve of th e innerdisk can be determined by an ingenious tangent—point meth od using HI gas (B li~ & Spergel l 99 1) while th e rotati on curve...
tion curves of spiral galaxies,including our Milky Way,are neith er ri gid V (R ) 。( R nor Keplerian (R ) 。( R ¨ 2.The curve of th e innerdisk can be determined by an ingenious tangent—point meth od using HI gas (B li~ & Spergel l 99 1) while th e rotati on curve...
Later, It was demonstratedthat dark matter is not only an exotic property of clustersbut can also be found in single galaxies to explain their flatrotation curves. The dark matter problem has also beenaddressed through extended theories of gravity [2, 3].The second proposal results in the ...
Rotation curves in Bose-Einstein Condensate Dark Matter Halos The study of the rotation curves of spiral galaxies reveals a nearly constant cored density distribution of Cold Dark Matter. N-body simulations however le... M Dwornik,Z Keresztes,LÁ Gergely - 《Journal of Magnetohydrodynamics Plasma ...