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Paper: The Nature and Evolution of Hα Emitters at High-z with HiZELS
Volume: 446, Galaxy Evolution: Infrared to Millimeter Wavelength Perspective
Page: 249
Authors: Sobral, D.; Best, P.; Smail, I.; Geach, J.; HiZELS team
Abstract: The High-z Emission Line Survey (HiZELS) is targeting Hα emitters at z∼0.8–2.2, and, by probing large volumes down to faint fluxes with WFCAM on UKIRT, is resulting in the largest samples of high-z Hα selected star-forming galaxies. With HiZELS, we have accurately measured the evolution of the Hα luminosity function up to z > 2 in a fully consistent way and determined the Hα-based star formation history of the Universe since z∼2.2 for the first time. We have found important morphology-Hα relations and have been able to show that it is the evolution of disk galaxies from z∼1 to z∼0 that is responsible for the decline in the cosmic star formation activity – not the decline in merger activity. Furthermore, we have conducted the first detailed clustering analysis of Hα emitters at z∼1 and their evolution up to z > 2, not only finding strong relations with Hα luminosity and infra-red luminosity, but also suggesting a single, fundamental relation valid over the last 10 Gyrs, relating the dark-matter halo mass and quenching of star-formation across cosmic time. HiZELS is probing a large variety of environments, enabling us to detail the dependence of star formation activity on environment and stellar mass, reconciling previous contradictory results in the literature and providing a much sharper view of our understanding at z∼1.
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