Galaxy evolution in Abell 85: Cluster substructure and environmental effects on the blue galaxy population

被引：0
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作者：
Bravo-Alfaro, H. [1 ]
Caretta, C.A. [1 ]
Lobo, C. [2 ,3 ]
Durret, F. [4 ]
Scott, T. [5 ]
机构：
[1] Departamento de Astronomía, Universidad de Guanajuato, Apdo. Postal 144, Guanajuato 36000, Mexico
[2] Centro de Astrofísica, Universidade Do Porto, Rua das Estrelas, 4150-762 Porto, Portugal
[3] Depto. de Matemática Aplicada, Faculdade de Ciências, Univ. Do Porto, R. do Campo Alegre 687, 4169-007 Porto, Portugal
[4] Institut d'Astrophysique de Paris, CNRS, UMR 7095, Université Pierre et Marie Curie, 98bis Bd Arago, 75014 Paris, France
[5] Center for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield, AL10 9AB, United Kingdom
来源：
Astronomy and Astrophysics | 2009年 / 495卷 / 02期
关键词：
In this series of papers we explore the evolution of late-type galaxies in the rich cluster Abell85. In this first paper we revisit the complex dynamical state of A 85 by using independent methods. First; we analyze the galaxy redshift distribution towards A 85 in the whole range 0-40000 km s-1; and determine the mean redshifts of the background clusters A 87 and A 89; very close in projection to A 85. Then we search for substructures in A 85 by considering the 2D galaxy distribution of its members (13000-20000 km s -1) and by applying the kinematical 3D -test to both projected positions and radial velocities. This clearly reveals several substructures: one close to the cluster core and three more projected towards the southeast; along the region where an X-ray filament has been extensively studied. We also analyse the distribution of the brightest blue galaxies across a major fraction of the cluster volume; considering if they are gas-rich or poor. We report a very asymmetric distribution of the blue member galaxies; with most of them to the east and southeast; namely in the region joining the core of A 85 to its farthest substructure in this direction - dubbed the SE clump. By matching our sample of bright blue member galaxies with H I detections reported in the literature; we identify gas-rich and gas-poor ones. As expected; the H I-rich blue galaxies follow the same trend as the parent sample; with most of them projected on the eastern side of the cluster as well. Interestingly no blue objects have been detected in H I up to a projected radius of 2 Mpc in this zone. We finally estimate the ram pressure stripping exerted by the intra-cluster medium as a function of the projected distance from A 85; in order to quantify how important this mechanism might be in sweeping the gas out of the infalling spirals. © 2009 ESO;
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页码：379 / 387
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