Galaxy and mass assembly (GAMA): Merging galaxies and their properties

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Abstract

We derive the close pair fractions and volume merger rates for galaxies in the Galaxy and Mass Assembly (GAMA) survey with -23 < Mr < -17 (ΩM = 0.27, ΩΔ = 0.73, H0 = 100 km s-1 Mpc-1) at 0.01 < z<0.22 (look-back time of <2 Gyr). The merger fraction is approximately 1.5 per cent Gyr-1 at all luminosities (assuming 50 per cent of pairs merge) and the volume merger rate is ≈3.5 × 10-4 Mpc-3 Gyr-1. We examine how the merger rate varies by luminosity and morphology. Dry mergers (between red/spheroidal galaxies) are found to be uncommon and to decrease with decreasing luminosity. Fainter mergers are wet, between blue/discy galaxies. Damp mergers (one of each type) follow the average of dry and wetmergers. In the brighter luminosity bin (-23

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De Propris, R., Baldry, I. K., Bland-Hawthorn, J., Brough, S., Driver, S. P., Hopkins, A. M., … Robotham, A. S. G. (2014). Galaxy and mass assembly (GAMA): Merging galaxies and their properties. Monthly Notices of the Royal Astronomical Society, 444(3), 2200–2211. https://doi.org/10.1093/mnras/stu1452

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