The Nature and Evolution of Hα Emitters at High-z with HiZELS

Details The Nature and Evolution of Hα Emitters at High-z with HiZELS The Nature and Evolution of Hα Emitters at High-z with HiZELS

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aspc..446..249s&link_type=abstract

Galaxy evolution: Infrared to millimeter wavelength perspective. Proceedings of a conference held at Guilin, China 25-29 October

Astronomy and Astrophysics

Astronomy

Scientific paper

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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