Star-forming galaxies in low-redshift clusters: comparison of integrated properties of cluster and field galaxies

被引：5
|
作者：
Bretherton, C. F. [1 ,2 ]
James, P. A. [1 ]
Moss, C. [1 ]
Whittle, M. [3 ]
机构：
[1] Liverpool John Moores Univ, Astrophys Res Inst, Birkenhead CH41 1LD, Merseyside, England
[2] Carter Observ, Wellington, New Zealand
[3] Univ Virginia, Dept Astron, Charlottesville, VA 22903 USA
来源：
ASTRONOMY & ASTROPHYSICS | 2010年 / 524卷
基金：
美国国家航空航天局;
关键词：
galaxies: clusters: general; galaxies: evolution; galaxies: interactions; EMISSION-LINE GALAXIES; H-ALPHA SURVEY; MERGING DISK GALAXIES; DIGITAL SKY SURVEY; SPIRAL GALAXIES; FORMATION RATES; ENVIRONMENTAL DEPENDENCE; NEARBY CLUSTERS; S0; GALAXIES; SURFACE PHOTOMETRY;
D O I：
10.1051/0004-6361/200913284
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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 H alpha+[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.
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页数：9
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