Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 391, Issue 2, Pages 607-616Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2008.13963.x
Keywords
methods: statistical; galaxies: clusters: general; galaxies: fundamental parameters; galaxies: statistics
Categories
Funding
- STFC
- Qatar Foundation for Education, Science and Community Development
- European Commission
- NSF
- Direct For Mathematical & Physical Scien
- Division Of Mathematical Sciences [0806009] Funding Source: National Science Foundation
- STFC [ST/F00298X/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/F00298X/1] Funding Source: researchfish
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The distributions of galaxy properties vary with environment, and are often multimodal, suggesting that the galaxy population may be a combination of multiple components. The behaviour of these components versus environment holds details about the processes of galaxy development. To release this information we apply a novel, non-parametric statistical technique, identifying four components present in the distribution of galaxy Ha emission-line equivalent widths. We interpret these components as passive, star forming and two varieties of active galactic nuclei. Independent of this interpretation, the properties of each component are remarkably constant as a function of environment. Only their relative proportions display substantial variation. The galaxy population thus appears to comprise distinct components which are individually independent of environment, with galaxies rapidly transitioning between components as they move into denser environments.
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