Volume 524, December 2010
|Number of page(s)||9|
|Section||Cosmology (including clusters of galaxies)|
|Published online||22 November 2010|
Star-forming galaxies in low-redshift clusters: comparison of integrated properties of cluster and field galaxies⋆
Astrophysics Research Institute, Liverpool John Moores
2 Carter Observatory, Wellington, New Zealand
3 Department of Astronomy, University of Virginia, Charlottesville, VA 22903, USA
Received: 11 September 2009
Accepted: 20 September 2010
Aims. We investigate the effect of the cluster environment on the star formation properties of galaxies in 8 nearby Abell clusters.
Methods. Star formation properties are determined for individual galaxies using the equivalent width of Hα + [Nii] line emission from narrow-band imaging. Equivalent width distributions are derived for each galaxy type in each of 3 environments - cluster, supercluster (outside the cluster virial radius) and field. The effects of morphological disturbance on star formation are also investigated.
Results. We identify a population of early-type disk galaxies in the cluster population with enhanced star formation compared to their field counterparts. The enhanced cluster galaxies frequently show evidence of disturbance, and the disturbed galaxies show marginal evidence for a higher velocity dispersion, possibly indicative of an infalling population.
Key words: galaxies: clusters: general / galaxies: evolution / galaxies: interactions
Based on observations made with the Nordic Optical Telescope, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias; and with the Jacobus Kapteyn Telescope, which was operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.
© ESO, 2010
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