Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-10-29
Astronomy and Astrophysics
Astrophysics
10 pages, 12 figures, MNRAS, in press, higher resolution version at http://www-theorie.physik.unizh.ch/~mapelli/astroph/GLSB2.
Scientific paper
10.1111/j.1365-2966.2007.12650.x
We simulate the collisional formation of a ring galaxy and we integrate its evolution up to 1.5 Gyr after the interaction. About 100-200 Myr after the collision, the simulated galaxy is very similar to observed ring galaxies (e.g. Cartwheel). After this stage, the ring keeps expanding and fades. Approximately 0.5-1 Gyr after the interaction, the disc becomes very large (~100 kpc) and flat. Such extended discs have been observed only in giant low surface brightness galaxies (GLSBs). We compare various properties of our simulated galaxies (surface brightness profile, morphology, HI spectrum and rotation curve) with the observations of four well-known GLSBs (UGC6614, Malin 1, Malin 2 and NGC7589). The simulations match quite well the observations, suggesting that ring galaxies could be the progenitors of GLSBs. This result is crucial for the cold dark matter (CDM) model, as it was very difficult, so far, to explain the formation of GLSBs within the CDM scenario.
Colpi Monica
Giordano Lara
Mapelli Michela
Mayer Larry
Moore Ben
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