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An almost head-on collision as the origin of two off-centre rings in the Andromeda galaxy
D. L. Block, F. Bournaud, F. Combes +6
The unusual morphology of the Andromeda Spiral (Messier 31, the closest spiral galaxy to the Milky Way) has long been an enigma. Although regarded for decades as showing little evi…
Tidal Dwarf Galaxies as Laboratories of Star Formation and Cosmology
Pierre-Alain Duc, Frederic Bournaud, Mederic Boquien
Star formation may take place in a variety of locations in interacting systems: in the dense core of mergers, in the shock regions at the interface of the colliding galaxies and ev…
From Tidal Dwarf Galaxies to Satellite Galaxies
F. Bournaud, P. -A. Duc
Cosmological models have granted dwarf galaxies a key role: their properties constrain the distribution of dark matter and the physical evolution of their hosts. There is increasin…
Stellar kinematics for the central spheroid in the Polar Disk Galaxy NGC4650A
E. Iodice, M. Arnaboldi, R. P. Saglia +7
We have obtained high angular resolution, high signal-to-noise spectra of the Calcium triplet absorption lines on the photometric axes of the stellar spheroid in the polar disk gal…