Wednesday.
1409.6302
Lessons from the Local Group (and beyond) on dark matter
Kroupa
Why DM does cannot exist. (i) The two types of dwarf galaxies, the primordial dwarfs with DM and the tidal dwarf galaxies without DM, out to present clear observational difference, but there is no evidence for two separate families of dwarfs, neither in terms of their location relative to the baryon TF relation nor in forms of their radius-mass relation. And the arrangements in rotation disk-of-satellites, in particular around the MW and Andromeda, has been found to be only consistent with most of not all dwarf satellite galaxies being tidal dwarf galaxies. The highly symmetric structure of the entire LG too is inconsistent with its galaxies stemming from a stochastic merger-driven hierarchical buildup over cosmic time. (ii) Dynamical friction on the expansive and massive DM haloes is not evident in the data.
No comments:
Post a Comment