The Galaxy Major Merger Rate at 3<z<6

Astronomy and Astrophysics – Astronomy

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Scientific paper

We compute the galaxy pair fraction and major merger rate from Lyman break galaxies, selected as BVi'-band dropouts from the Hubble Ultra Deep Field and the Great Observatories Origins Deep Survey Fields. From these flux-limited surveys, we construct a volume-limited sample of galaxies with -25.0 1, and peaks at z_frac = 1.37 +- 0.10. Based on variety of plausible merger timescales, we find that 50-80% of luminous galaxies seen today will not have experienced a major merger in the Hubble time. Our observed space density of major mergers is well parameterized by a two-component power-law. We speculate on the role major mergers play in triggering a starburst and/or AGN. We acknowledge NASA grant AR-11772 from STScI, which is operated by AURA, Inc., under NASA contract NAS5-26555.

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