Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733549s&link_type=abstract
American Astronomical Society, AAS Meeting #217, #335.49; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Fragmentation of the star-forming rings in collisional ring galaxies is considered from the standpoint of traditional thin-gaseous-disk instability criteria. The number of bright fragments ("diamonds" in the rings on a kiloparsec-size scale) depends on the dominant mechanism of gas fragmentation in the ring. We consider two mechanisms: that of Elmegreen and that of Safronov-Toomre-Kennicutt (STF, applied to both density wave-induced and material rings) and compare the theoretically predicted number of "diamonds" with observations.
We employ kinematical and photometrical parameters obtained for a sample of six collisional rings which were observed with the multi-mode imager/spectrograph/IFP SCORPIO at the 6-m telescope BTA (Russia). We find that the pure-gaseous-disk instability criterion (i.e., STF) predicts the correct number of the fragments in the rings.
Bizyaev Dimitry
Moiseev Aleksei
Saburova Anna
Vorobyov Eduard
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