Shapley Optical Survey - II. The effect of environment on the colour-magnitude relation and galaxy colours★

Haines, C. P.; Merluzzi, P.; Mercurio, A.; Gargiulo, A.; Krusanova, N. L.; Busarello, G.; Barbera, F. La; Capaccioli, M.

doi:10.1111/j.1365-2966.2006.10637.x

Cited by 82 publications

(63 citation statements)

References 59 publications

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“…Balogh et al 1999;Lewis et al 2002;Gómez et al 2003;Finn et al 2005). It is also consistent with the result that the relative fraction of blue galaxies peaks between 1 and 2 R Vir in the nearby Shapley and Pisces-Cetus superclusters (Haines et al 2006;Porter & Raychaudhury 2006).…”

Section: Discussionsupporting

confidence: 78%

Flaming, bright galaxies along the filaments of A 2744

Braglia

Pierini

Böhringer

2007

A&A

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Context. The existence of a lumpy, large-scale filamentary structure is at the basis of the current paradigm of cosmic formation and evolution of clusters. The star-formation history of galaxies falling into a cluster is altered as a result of the environmental stresses. Aims. We investigate the relation between substructure and properties of the galaxy population in a 30 × 30 region centred on the massive merging cluster A 2744 at z ∼ 0.3. Methods. Multi-object spectroscopy at low resolution and BVR photometry are used to detect the presence of substructure through a Dressler-Schectman analysis and the photometric redshift technique, respectively. Galaxies at the same photometric redshift of the cluster are divided into red and blue according to their distribution in the B − R vs. R colour-magnitude diagram. Results. We identify two large-scale filaments associated with A 2744. Along these filaments, the blue-to-red galaxy number ratio increases together with the cluster-centric distance but peaks slightly beyond the cluster virial radius. The filaments host a population of bright, large (i.e. more luminous than R for the main body of the cluster and with angular sizes of 13-22 h −1 70 kpc) blue galaxies that is hardly found among galaxies lying in a neighbouring low-density environment at the same redshift of the cluster. Conclusions. These results can be interpreted as a manifestation of galaxy harassment.

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Section: Discussionsupporting

confidence: 78%

Flaming, bright galaxies along the filaments of A 2744

Braglia

Pierini

Böhringer

2007

A&A

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“…Our study shows the importance of the role of superclusters as high density environment which affects the properties of galaxies and galaxy systems in them (Plionis 2004;Wolf et al 2005;Haines et al 2006;Einasto et al 2007c;Porter et al 2008;Tempel et al 2009;Fleenor & Johnston-Hollitt 2010;Tempel et al 2011;Einasto et al 2011e). Earlier studies of galaxy superclusters revealed that while according to their overall properties superclusters can be described with a small number of parametres (Einasto et al 2011c), the analysis of the morphology and galaxy and group content of the richest superclusters from the 2dF Galaxy Redshift Survey and from the Sloan Great Wall with SDSS data ) demonstrate a large variety of supercluster morphologies and differences in the distribution of galaxies from various populations, and groups of galaxies in superclusters.…”

Section: Discussionmentioning

confidence: 99%

Multimodality of Rich Clusters From the SDSS Dr8 Within the Supercluster-Void Network

Einasto

2015

The Thirteenth Marcel Grossmann Meeting

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Context. The study of the properties of galaxy clusters and their environment gives us information about the formation and evolution of galaxies, groups and clusters, and larger structures -superclusters of galaxies and the whole cosmic web. Aims. We study the relations between the multimodality of galaxy clusters drawn from the SDSS DR8 and the environment where they reside. As cluster environment we consider the global luminosity density field, supercluster membership, and supercluster morphology. Methods. We use 3D normal mixture modelling, the Dressler-Shectman test, and the peculiar velocity of cluster main galaxies as signatures of multimodality of clusters. We calculate the luminosity density field to study the environmental densities around clusters, and to find superclusters where clusters reside. We determine the morphology of superclusters with the Minkowski functionals and compare the properties of clusters in superclusters of different morphology. We apply principal component analysis to study the relations between the multimodality parametres of clusters and their environment simultaneously. Results. Multimodal clusters reside in higher density environment than unimodal clusters. Clusters in superclusters have higher probability to have substructure than isolated clusters. The superclusters can be divided into two main morphological types, spiders and filaments. Clusters in superclusters of spider morphology have higher probabilities to have substructure and larger peculiar velocities of their main galaxies than clusters in superclusters of filament morphology. The most luminous clusters are located in the high-density cores of rich superclusters. Five of seven most luminous clusters, and five of seven most multimodal clusters reside in spider-type superclusters; four of seven most unimodal clusters reside in filament-type superclusters. Conclusions. Our study shows the importance of the role of superclusters as high density environment which affects the properties of galaxy systems in them.

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“…This makes them ideal laboratories to study processes that affect the evolution of galaxies, groups, and clusters of galaxies. A number of studies have already shown that the supercluster environment affects the properties of galaxies, groups, and clusters located there (Einasto et al 2003b;Plionis 2004;Wolf et al 2005;Haines et al 2006;Einasto et al 2007c;Porter et al 2008;Tempel et al 2009;Fleenor & Johnston-Hollitt 2010;Tempel et al 2011;Einasto et al 2011). Other evidence about the influence of the largescale environment of galaxies on their properties comes from the study of the properties of galaxies in void walls (Ceccarelli et al 2008) and from the study of the large-scale environment of quasars (Lietzen et al 2009).…”

Section: Introductionmentioning

confidence: 99%

SDSS DR7 superclusters

Einasto

Liivamägi

Tago

et al. 2011

A&A

122

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Aims. We study the morphology of a set of superclusters drawn from the SDSS DR7. Methods. We calculate the luminosity density field to determine superclusters from a flux-limited sample of galaxies from SDSS DR7 and select superclusters with 300 and more galaxies for our study. We characterise the morphology of superclusters using the fourth Minkowski functional V 3 , the morphological signature (the curve in the shapefinder's K 1 -K 2 plane) and the shape parameter (the ratio of the shapefinders K 1 /K 2 ). We investigate the supercluster sample using multidimensional normal mixture modelling. We use Abell clusters to identify our superclusters with known superclusters and to study the large-scale distribution of superclusters. Results. The superclusters in our sample form three chains of superclusters; one of them is the Sloan Great Wall. Most superclusters have filament-like overall shapes. Superclusters can be divided into two sets; more elongated superclusters are more luminous, richer, have larger diameters and a more complex fine structure than less elongated superclusters. The fine structure of superclusters can be divided into four main morphological types: spiders, multispiders, filaments, and multibranching filaments. We present the 2D and 3D distribution of galaxies and rich groups, the fourth Minkowski functional, and the morphological signature for all superclusters. Conclusions. Widely different morphologies of superclusters show that their evolution has been dissimilar. A study of a larger sample of superclusters from observations and simulations is needed to understand the morphological variety of superclusters and the possible connection between the morphology of superclusters and their large-scale environment.

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Shapley Optical Survey - II. The effect of environment on the colour-magnitude relation and galaxy colours★

Cited by 82 publications

References 59 publications

Flaming, bright galaxies along the filaments of A 2744

Flaming, bright galaxies along the filaments of A 2744

Multimodality of Rich Clusters From the SDSS Dr8 Within the Supercluster-Void Network

SDSS DR7 superclusters

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