Tully-Fisher Relation and its Implications for Halo Density Profile and Self-interacting Dark Matter

Details Tully-Fisher Relation and its Implications for Halo Density Profile and Self-interacting Dark Matter Tully-Fisher Relation and its Implications for Halo Density Profile and Self-interacting Dark Matter

2000-02-24

arxiv.org/abs/astro-ph/0002451v2

Mon.Not.Roy.Astron.Soc. 318 (2000) 163

Astronomy and Astrophysics

Astrophysics

13 pages, revised version to be published in MNRAS

Scientific paper

We show that the Tully-Fisher relation observed for spiral galaxies can be explained in the current scenario of galaxy formation without invoking subtle assumptions, provided that galactic-sized dark haloes have shallow, core-like central profiles, with a core radius proportional to halo circular velocity. In such a system, both disk and halo contribute significantly to the maximum rotation of the disk, and the interaction between the disk and halo components acts to reduce the scatter in the Tully-Fisher relation. With model parameters chosen in plausible ranges, the model can well accommodate the zero-point, slope, scatter of the observed Tully-Fisher relation, as well as the large range of disk sizes. The model predicts that LSB disks obey a Tully-Fisher relation similar to that of normal disks, if disk mass-to-light ratio is properly taken into account. The halo profile required by the Tully-Fisher relation is as shallow as that required by the rotation curves of faint disks, but much shallower than that predicted by conventional CDM models. Our results cannot be explained by some of the recent proposals for resolving the conflict between conventional CDM models and the rotation-curve shapes of faint galaxies. If dark matter self-interaction (either scattering or annihilation) is responsible for the shallow profile, the observed Tully-Fisher relation requires the interaction cross section \sigma_X to satisfy <\sigma_{X}|v|>/m_{X}~10^{-16} cm^3/s/GeV.

Affiliated with

Also associated with

No associations

Rating

Tully-Fisher Relation and its Implications for Halo Density Profile and Self-interacting Dark Matter does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Tully-Fisher Relation and its Implications for Halo Density Profile and Self-interacting Dark Matter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tully-Fisher Relation and its Implications for Halo Density Profile and Self-interacting Dark Matter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-358095