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26th of October 2015 |
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Gas dynamics in tidal dwarf galaxies: disc formation at z=0 |
by Federico Lelli (CWRU) |
Tidal Dwarf Galaxies (TDGs) are recycled
objects that form within the collisional debris around interacting/merging
galaxies. Lelli
et al. (2015) investigate the gas dynamics in a sample of six TDGs and
find they can be described by rotating disc models. These TDGs also appear
to be devoid of non-baryonic dark matter, as expected from numerical
simulations in a LCDM cosmology. The image above shows three interacting
systems (NGC 4694, NGC 5291, and NGC 7252) and their bona-fide TDGs (in
yellow). Optical images are overlaid with UV emission from GALEX (pink) and
HI emission from the VLA (blue). Reference: Lelli, Duc, Brinks, Bournaud, McGaugh, Lisenfeld, Weilbacher, Boquien, Revaz, Braine, Koribalski, and Belles 2015, A&A, in press |