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From fields to a super-cluster: the role of the environment at z=0:84 with HiZELS

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Publication date2011
Host publicationEnvironment and the Formation of Galaxies: 30 years later: Proceedings of Symposium 2 of JENAM 2010
EditorsIgnacio Ferreras, Anna Pasquali
Place of PublicationBerlin
PublisherSpringer
Pages179-184
Number of pages6
ISBN (Print)9783642202841, 9783642269950
Original languageEnglish
Event2nd JENAM Symposium: Environment and the Formation of Galaxies: 30 Years Later, JENAM 2010 - Lisbon, Portugal
Duration: 6/09/201010/09/2010

Conference

Conference2nd JENAM Symposium: Environment and the Formation of Galaxies: 30 Years Later, JENAM 2010
CountryPortugal
CityLisbon
Period6/09/1010/09/10

Publication series

NameAstrophysics and Space Science Proceedings
PublisherSpringer

Conference

Conference2nd JENAM Symposium: Environment and the Formation of Galaxies: 30 Years Later, JENAM 2010
CountryPortugal
CityLisbon
Period6/09/1010/09/10

Abstract

At z=0, clusters are primarily populated by red, elliptical and massive galaxies, while blue, spiral and lower-mass galaxies are common in low-density environments. Understanding how and when these differences were established is of absolute importance for our understanding of galaxy formation and evolution, but results at high-z remain contradictory. By taking advantage of the widest and deepest Hα narrow-band survey at z=0:84 over the COSMOS and UKIDSS UDS fields, probing a wide range of densities (from poor fields to rich groups and clusters, including a confirmed super-cluster with a striking filamentary structure), we show that the fraction of star-forming galaxies falls continuously from ∼40% in fields to approaching 0% in rich groups/clusters. We also find that the median SFR increases with environmental density, at least up to group densities - but only for low and medium mass galaxies, and thus such enhancement is mass-dependent at z ∼ 1. The environment also plays a role in setting the faint-end slope (α) of the Hα luminosity function. Our findings provide a sharper view on galaxy formation and evolution and reconcile previously contradictory results at z∼1: stellar mass is the primary predictor of star formation activity, but the environment also plays a major role.