RASS-SDSS galaxy cluster survey

Popesso, P.; Biviano, A.; Böhringer, H.; Romaniello, M.

doi:10.1051/0004-6361:20054493

Cited by 86 publications

(139 citation statements)

References 79 publications

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“…This is not surprising since several authors have observed that optically selected structures have an X-ray emission lower than what is expected from the observations of X-ray selected groups and clusters. This effect has been observed at low redshift in small groups (Rasmussen et al 2006), in Abell clusters (Popesso et al 2007), and in clusters at 0.6 < z < 1.1 (Lubin et al 2004). These results may be explained by the optically selected structures still being in the process of formation or the result of the alignment of two substructures along the line of sight, although it cannot be excluded that they contain less intracluster gas than expected, because of the effect of strong galactic feedback (Rasmussen et al 2006).…”

Section: Discussionmentioning

confidence: 59%

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A comprehensive study of large-scale structures in the GOODS-SOUTH field up to ${\mathsf z} \sim $ 2.5

Salimbeni

Castellano

Pentericci

et al. 2009

A&A

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Aims. The aim of the present paper is to identify and study the properties and galactic content of groups and clusters in the GOODSSouth field up to z ∼ 2.5, and to analyse the physical properties of galaxies as a continuous function of environmental density up to high redshift. Methods. We used the deep (z 850 ∼ 26), multi-wavelength GOODS-MUSIC catalogue, which has a 15% of spectroscopic redshifts and accurate photometric redshifts for the remaining fraction. On these data, we applied a (2+1)D algorithm, previously developed by our group, that provides an adaptive estimate of the 3D density field. We supported our analysis with simulations to evaluate the purity and the completeness of the cluster catalogue produced by our algorithm. Results. We find several high-density peaks embedded in larger structures in the redshift range 0.4-2.5. From the analysis of their physical properties (mass profile, M 200 , σ v , L X , U − B vs. B diagram), we find that most of them are groups of galaxies, while two are poor clusters with masses a few times 10 14 M . For these two clusters we find from the Chandra 2Ms data an X-ray emission significantly lower than expected from their optical properties, suggesting that the two clusters are either not virialised or are gas poor. We find that the slope of the colour magnitude relation, for these groups and clusters, is constant at least up to z ∼ 1. We also analyse the dependence on environment of galaxy colours, luminosities, stellar masses, ages, and star formations. We find that galaxies in high-density regions are, on average, more luminous and massive than field galaxies up to z ∼ 2. The fraction of red galaxies increases with luminosity and with density up to z ∼ 1.2. At higher z this dependence on density disappears. The variation of galaxy properties as a function of redshift and density suggests that a significant change occurs at z ∼ 1.5-2.

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Section: Discussionmentioning

confidence: 59%

“…Dressler et al 1997;Blanton et al 2005;Cucciati et al 2006;Cooper et al 2007;Elbaz et al 2007). Moreover, the analysis of cluster properties at different wavelengths provides interesting insights into the matter content and evolutionary histories of these structures (Lubin et al 2004;Rasmussen et al 2006;Popesso et al 2007).…”

Section: Introductionmentioning

confidence: 99%

A comprehensive study of large-scale structures in the GOODS-SOUTH field up to ${\mathsf z} \sim $ 2.5

Salimbeni

Castellano

Pentericci

et al. 2009

A&A

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“…The criterion P ≤ 0.1 is commonly used as an indicator for substructures (e.g. Popesso et al 2007). We visualise the possible position of substructures in Fig.…”

Section: Substructurementioning

confidence: 99%

Ram pressure and dusty red galaxies – key factors in the evolution of the multiple cluster system Abell 901/902

Bösch

Böhm

Wolf

et al. 2013

A&A

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Aims. We present spectroscopic observations of 182 disk galaxies (96 in the cluster and 86 in the field environment) in the region of the Abell 901/902 multiple cluster system, which is located at a redshift of z ∼ 0.165. We estimate dynamical parameters of the four subclusters and analyse the kinematics of spiral galaxies, searching for indications of ram-pressure stripping. Furthermore, we focus on dusty red galaxies as a possible intermediate stage in the transformation of field galaxies to lenticulars when falling into the cluster. Methods. We obtained multi-object slit spectroscopy using the VLT instrument VIMOS. We carried out a redshift analysis, determined velocity dispersions using biweight statistics, and detected possible substructures with the Dressler-Shectman test. We exploited rotation curves from emission lines to analyse distortions in the gaseous disk of a galaxy, as well as HST/ACS images to quantify the morphological distortions of the stellar disk. Results. The presence of substructures and non-Gaussian redshift distributions indicate that the cluster system is dynamically young and not in a virialised state. We find evidence of two important galaxy populations. Morphologically distorted galaxies are probably subject to increased tidal interactions. They show pronounced rotation-curve asymmetries at intermediate cluster-centric radii and low rest-frame peculiar velocities. Morphologically undistorted galaxies show the strongest rotation-curve asymmetries at high rest-frame velocities and low cluster-centric radii. Supposedly, this group is strongly affected by ram-pressure stripping due to interaction with the intra-cluster medium. Among the morphologically undistorted galaxies, dusty red galaxies have particularly strong rotation-curve asymmetries, suggesting that ram pressure is an important factor in these galaxies. Furthermore, dusty red galaxies have on average a bulge-to-total ratio that is higher by a factor of two than cluster blue-cloud and field galaxies. The fraction of kinematically distorted galaxies is 75% higher in the cluster than in the field environment. This difference mainly stems from morphologically undistorted galaxies, indicating a cluster-specific interaction process that only affects the gas kinematics but not the stellar morphology. Also the ratio between gas and stellar scale length is reduced for cluster galaxies compared to the field sample. Both findings could be explained best by ram-pressure effects. Conclusions. Ram-pressure stripping seems to be an important interaction process in the multiple cluster system A901/902. Dusty red galaxies might be a crucial element in understanding the transformation of field disk galaxies into cluster lenticular galaxies.

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“…Several authors have presented catalogues of rich clusters of galaxies (Aguerri et al 2007;Popesso et al 2007;Miller et al 2005) using the SDSS data. All these group catalogues are constructed on the basis of spectroscopic data, using certain selection criteria.…”

Section: Introductionmentioning

confidence: 99%

Groups of galaxies in the SDSS Data Release 5

Tago¹,

Einasto²,

Saar³

et al. 2008

A&A

117

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Aims. We extract groups of galaxies from the SDSS Data Release 5 to study the supercluster-void network and environmental properties of groups therein. Groups of galaxies as density enhancements can be used to determine the luminosity density field of the supercluster-void network. Methods. We use a modified friends-of-friends (FoF) method with slightly variable linking lengths in transverse and radial directions to eliminate selection effects and to reliably find as many groups as possible. To determine the scaling of the linking length we calibrated group sizes and mean galaxy number densities within groups by shifting nearby groups to larger distances. Results. Our final sample contains 17 143 groups in the equatorial, and 33 219 groups in the northern part of the DR5 survey. The group catalogue is available at the CDS. Conclusions. The mean sizes and velocity dispersions of our groups practically do not change with their distance. This means that the selection effects have been properly taken into account when generating the group catalogue.

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RASS-SDSS galaxy cluster survey

Cited by 86 publications

References 79 publications

A comprehensive study of large-scale structures in the GOODS-SOUTH field up to ${\mathsf z} \sim $ 2.5

A comprehensive study of large-scale structures in the GOODS-SOUTH field up to ${\mathsf z} \sim $ 2.5

Ram pressure and dusty red galaxies – key factors in the evolution of the multiple cluster system Abell 901/902

Groups of galaxies in the SDSS Data Release 5

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