Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sf2a.conf..344m&link_type=abstract
SF2A-2007: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics held in Grenoble, France, July
Astronomy and Astrophysics
Astrophysics
Scientific paper
Observations show that a large part of the stars seen today formed during bursts of star formation, which in the Local Universe appear to be mostly triggered by galaxy mergers. Yet, simulations of galaxy mergers rarely induce starbursts as intense as those observed, in particular at high redshift. Moreover, observations suggest that large-scale structures could trigger the star formation at z≃1 and above. We have then investigated the influence of the proximity of a cluster on star formation. We performed a large set of numerical simulations, in which clusters were modeled by analytical potential wells. We mainly focused on galaxies located in the periphery of these potentials. We show that, while the potentials of clusters do not directly trigger starbursts in single galaxies, merger-induced starbursts are on average twice more intense when the mergers take place in the vicinity of such large structures. This enhancement affects not only the instantaneous SFR, but also the total stellar mass formed during these events. We thus demonstrate a significant effect of the large-scale environment on star formation in galaxies, caused by the tidal field of large structures.
Bournaud Frederic
Martig Marie
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