Tidal dwarf galaxies as a test of fundamental physics

Astronomy and Astrophysics – Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Accepted for publication in A&A Letters, 5 pages, 3 figures

Scientific paper

10.1051/0004-6361:20078081

Within the cold dark matter (CDM) framework tidal dwarf galaxies (TDGs) cannot contain dark matter, so the recent results by Bournaud et al. (2007) that 3 rotating TDGs do show significant evidence for being dark matter dominated is inconsistent with the current concordance cosmological theory unless yet another dark matter component is postulated. We confirm that the TDG rotation curves are consistent with Newtonian dynamics only if either an additional dark matter component is postulated, or if all 3 TDGs happen to be viewed nearly edge-on, which is unlikely given the geometry of the tidal debris. We also find that the observed rotation curves are very naturally explained without any free parameters within the modified Newtonian dynamics (MOND) framework if inclinations are adopted as derived by Bournaud et al. We explore different inclination angles and two different assumptions about the external field effect. The results do not change significantly, and we conclude therefore that Newtonian dynamics has severe problems while MOND does exceedingly well in explaining the observed rotation curves of the 3 TDGs studied by Bournaud et al.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Tidal dwarf galaxies as a test of fundamental physics 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 Tidal dwarf galaxies as a test of fundamental physics, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tidal dwarf galaxies as a test of fundamental physics will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-330167

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.