Results for "A. Biviano"

total 238142took 0.14s
Galaxy systems in the optical and infraredNov 21 2008In these three lectures a review is provided of the properties of galaxy systems as determined from optical and infrared measurements. Covered topics are: clusters identification, global cluster properties and their scaling relations, cluster internal ... More
The radial profiles of the different mass components in galaxy clustersNov 10 2005Mar 03 2006AIMS. To derive the mass profiles of the different luminous and dark components in clusters. METHODS. The cluster mass profile is determined by using the Jeans equation applied to the projected phase-space distribution of about 3000 galaxies members of ... More
The AGN fraction - velocity dispersion relation in clusters of galaxiesOct 25 2006Some previous investigations have found that the fraction (f_AGN) of active galactic nuclei (AGNs) is lower in clusters than in the field. This can result from the suppression of galaxy-galaxy mergers in high-velocity dispersion (sigma_v) clusters, if ... More
The evolution of mass profiles of galaxy clustersDec 02 2009We determine the average mass profile of galaxy clusters at two different redshifts and compare its evolution with cosmological model predictions. We use two samples of galaxy clusters spanning similar (evolutionary corrected) mass ranges at different ... More
The orbital velocity anisotropy of cluster galaxies: evolutionMay 18 2009Jul 29 2009In nearby clusters early-type galaxies follow isotropic orbits, while the orbits of late-type galaxies are characterized by slightly radial anisotropy. Little is known about the orbits of the different populations of cluster galaxies at redshift above ... More
Segregations in clusters of galaxiesSep 26 1997We analyse a sample of about 2000 galaxies in 40 regular clusters, to look for evidence of segregation with respect to galaxy luminosities and morphological types. We find evidence of luminosity segregation for galaxies brighter than $M_R < -21.5$, i.e. ... More
ISO's Contribution to the Study of Clusters of GalaxiesJun 17 2005Aug 22 2005Starting with nearby galaxy clusters like Virgo and Coma, and continuing out to the furthest galaxy clusters for which ISO results have yet been published ($z=0.56$), we discuss the development of knowledge of the infrared and associated physical properties ... More
The universal distribution of halo interlopers in projected phase space. Bias in galaxy cluster concentration and velocity anisotropy?Feb 26 2010Sep 28 2010When clusters of galaxies are viewed in projection, one cannot avoid picking up foreground/background interlopers (FBIs), that lie within the virial cone (VC), but outside the virial sphere. Structural & kinematic deprojection equations are not known ... More
MAMPOSSt: Modelling Anisotropy and Mass Profiles of Observed Spherical Systems. I. Gaussian 3D velocitiesDec 06 2012Jan 04 2013Mass modelling of spherical systems through internal motions is hampered by the mass/velocity anisotropy (VA) degeneracy inherent in the Jeans equation, as well as the lack of techniques that are both fast and adaptable to realistic systems. A new fast ... More
Chemical Enrichment and Energetics of the ICM with RedshiftSep 26 2001In this paper we show preliminary results concerning the chemical and energetic enrichment of the ICM by means of supernova-driven wind models in elliptical galaxies. These models are obtained by taking into account new prescriptions about supernova remnant ... More
ENACSVII, Galaxy density profiles of rich clusters of galaxiesApr 17 1998We have analyzed the projected galaxy distributions in a subset of the ENACS/ COSMOS cluster sample. We made Maximum-Likelihood fits to the distribution of COSMOS galaxies for 4 theoretical profiles, with `cores' (generalized King- and Hubble-profiles) ... More
The build-up of the Coma cluster by infalling substructuresJul 22 2005We present a new multiwavelength analysis of the Coma cluster subclustering based on recent X-ray data and on a compilation of nearly 900 redshifts. We characterize subclustering using the Serna&Gerbal (1996) hierarchical method which makes use of galaxy ... More
The Mass Function of Nearby Galaxy ClustersApr 08 1993We present the distribution of virial masses for nearby galaxy clusters, as obtained from a data-set of 75 clusters, each having at least 20 galaxy members with measured redshifts within 1 Abell radius. After having accounted for problems of incompleteness ... More
Clues on the Evolution of Cluster Galaxies From The Analysis of Their Orbital AnisotropiesJan 17 2003We study the evolution of galaxies in clusters by the analysis of a sample of about 3000 galaxies, members of 59 clusters from the ESO Nearby Abell Cluster Survey (ENACS). We distinguish four cluster galaxy populations, based on their radial and velocity ... More
The Fundamental Plane of clusters of galaxiesSep 25 1997We have used the ESO Nearby Abell Cluster Survey (ENACS) in combination with the Cosmos Galaxy Catalogue, to investigate the existence of a Fundamental Plane (FP) for rich clusters of galaxies. The 20 clusters with the most regular projected galaxy distributions ... More
The RASS-SDSS Galaxy Cluster Survey. III. Scaling relations of galaxy clustersNov 18 2004We use the RASS-SDSS galaxy cluster sample to compare the quality of optical and X-ray luminosities as predictors of other cluster properties such as their masses, temperatures, and velocity dispersions. We use the SDSS spectroscopic data to estimate ... More
Multi-wavelength study of X-ray luminous clusters at z ~ 0.3 I. Star formation activity of cluster galaxiesFeb 09 2009The current paradigm of cosmic formation and evolution of galaxy clusters foresees growth mostly through merging. Galaxies in the infall region or in the core of a cluster undergo transformations owing to different environmental stresses. For two X-ray ... More
RASS-SDSS Galaxy Cluster Survey. IV. A ubiquitous dwarf galaxy population in clustersJun 09 2005We analyze the Luminosity Functions (LFs) of a subsample of 69 clusters from the RASS-SDSS galaxy cluster catalog. When calculated within the cluster physical sizes, given by r200 or r500, all the cluster LFs appear to have the same shape, well fitted ... More
RASS-SDSS Galaxy Cluster Survey. VI. The dependence of the cluster SFR on the cluster global propertiesSep 04 2006Sep 05 2006Using a subsample of 79 nearby clusters from the RASS-SDSS galaxy cluster catalogue of Popesso et al. (2005a), we perform a regression analysis between the cluster integrated star formation rate (Sigma_SFR) the cluster total stellar mass (M_star), the ... More
RASS-SDSS Galaxy Cluster Survey. VII. On the Cluster Mass to Light ratio and the Halo Occupation DistributionJun 12 2006We explore the mass-to-light ratio in galaxy clusters and its relation to the cluster mass. We study the relations among the optical luminosity ($L_{op}$), the cluster mass ($M_{200}$) and the number of cluster galaxies within $r_{200}$ ($N_{gal}$) in ... More
Optical Radii of Galaxy ClustersAug 29 1994We analyze the density profiles and virial radii for a sample of 90 nearby clusters, using galaxies with available redshifts and positions. Each cluster has at least 20 redshifts measured within an Abell radius, and all the results come from galaxy sets ... More
RASS-SDSS Galaxy Cluster Survey. V. The X-ray-Underluminous Abell ClustersJun 08 2006In this paper we consider a large sample of optically selected clusters, in order to elucidate the physical reasons for the existence of X-ray underluminous clusters. For this purpose we analyze the correlations of the X-ray and optical properties of ... More
The ESO Nearby Abell Cluster Survey. XI. Segregation of cluster galaxies and subclusteringJan 31 2002We study luminosity and morphology segregation of over 3000 cluster galaxies in an ensemble cluster of 59 rich, nearby galaxy clusters observed in the ESO Nearby Cluster Survey (ENACS). Within this sample we identify those galaxies that are in substructures. ... More
Mass Profiles of Galaxy Clusters from the Projected Phase-space Distribution of Cluster MembersJul 04 2006I review our current knowledge of the mass distribution in clusters, as obtained from the analysis of the projected phase-space distribution of cluster galaxies. I discuss the methods of analysis, their relative advantages and disadvantages, and their ... More
Tracing the mass profiles of galaxy clusters with member galaxiesSep 22 2005The mass distribution of galaxy clusters can be determined from the study of the projected phase-space distribution of cluster galaxies. The main advantage of this method as compared to others, is that it allows determination of cluster mass profiles ... More
From Messier to Abell: 200 years of science with galaxy clustersOct 20 2000I review the history of scientific research on galaxy clusters, from 1784, the year of publication of Messier's catalogue, to 1983, the year of George O. Abell's premature death. My review covers four main topics: 1) the distribution of clusters, 2) the ... More
Tracing the Cluster Internal Dynamics with Member GalaxiesOct 02 2001The analysis of the spatial distribution and kinematics of galaxies in clusters allows one to determine the cluster internal dynamics. In this paper, I review the state of the art of this topic. In particular, I summarize what we have learned so far about ... More
Our Best Friend, The Coma Cluster (A Historical Review)Nov 21 1997In this paper I describe how our knowledge and understanding of the properties and structure of the Coma cluster of galaxies has evolved through the years, since early this century, when the first maps of the density of nebulae in the Coma region were ... More
Structural and dynamical modeling of WINGS clusters. II. The orbital anisotropies of elliptical, spiral and lenticular galaxiesJan 18 2019The orbital shapes of galaxies is a probe of their formation and evolution. The Bayesian MAMPOSSt mass/orbit modeling algorithm is used to jointly fit the distribution of elliptical (E), spiral/Irr (S), and S0 galaxies in projected phase space, on 3 pseudo-clusters ... More
Structural and dynamical modeling of WINGS clusters. II. The orbital anisotropies of elliptical, spiral and lenticular galaxiesJan 18 2019Aug 02 2019The Bayesian MAMPOSSt mass/orbit modeling algorithm is used to jointly fit the distribution of elliptical, spiral (and irregular), and lenticular galaxies in projected phase space, on 3 stacked clusters (with normalized positions and velocities) of 54 ... More
Structures in Galaxy ClustersSep 30 1993The analysis of the presence of substructures in 16 well-sampled clusters of galaxies suggests a stimulating hypothesis: Clusters could be classified as unimodal or bimodal, on the basis of to the sub-clump distribution in the {\em 3-D} space of positions ... More
On the efficiency and reliability of cluster mass estimates based on member galaxiesMay 05 2006We study the efficiency and reliability of cluster mass estimators that are based on the projected phase-space distribution of galaxies in a cluster region. To this aim, we analyse a data-set of 62 clusters extracted from a concordance LCDM cosmological ... More
The Kinematics of Emission-Line Galaxies in Clusters from ENACSAug 31 1995By using the ENACS data, we have studied the properties of emission-line galaxies (ELG) in clusters. The fraction of ELG in clusters is 16~%; this fraction is slightly dependent on the cluster velocity dispersion, being larger for ``colder'' systems. ... More
The ESO Nearby Abell Cluster Survey: Properties of the GalaxiesOct 30 1998In this paper we summarize the main properties of the ENACS (the ESO Nearby Abell Cluster Survey), which was one of the ESO Keyprogrammes carried out in the first half of the 1990's, and we discuss some recent work on the properties of the galaxies in ... More
ISOCAM Observations of Intermediate-redshift Galaxy Clusters at 7 and 15 micronsJul 13 2004The gravitationally lensing clusters A370, A2218, A1689 and CL0024+1654 were observed with the Infrared Space Observatory (ISO) using ISOCAM at 6.7 and 14.3 microns (hereafter 7 and 15 microns respectively). A total of 178 sources were detected in the ... More
Weak lensing observations of potentially X-ray underluminous galaxy clustersMar 20 2009Apr 15 2009Optically selected clusters of galaxies display a relation between their optical mass estimates and their X-ray luminosities Lx that has a large scatter. A substantial fraction of optically selected clusters have Lx estimates or upper limits significantly ... More
SPITZER observations of Abell 1763. III. The infrared luminosity function in different supercluster environmentsJun 08 2011Jul 20 2011We determine the galaxy infrared (IR) luminosity function (LF) as a function of the environment in a supercluster at z=0.23, using optical, near-IR, and mid- to far-IR photometry, as well as redshifts from optical spectroscopy. We identify 467 supercluster ... More
The Kinematics of Emission-Line Galaxies in Clusters from ENACSNov 13 1995Summary - By using the data from the ESO Nearby Abell Cluster Survey (ENACS), we have studied the properties of emission-line galaxies (ELG) in clusters. The fraction of ELG in clusters is 16~\%; this fraction is slightly dependent on the cluster velocity ... More
A photometric catalogue of the Coma cluster coreAug 23 1996We have obtained a mosaic of CCD images of the Coma cluster in the V-band covering a region of approximately 0.4 degrees$^2$ around both central cluster galaxies NGC 4889 and NGC 4874. An additional frame of $\sim$ 90 arcmin$^2$ was taken of the south-west ... More
On the galaxy luminosity function in the central regions of the Coma clusterNov 07 1994We have obtained new redshifts for 265 objects in the central 48~$\times$~25~arcmin$^2$ region of the Coma cluster. When supplemented with literature data, our redshift sample is 95~\% complete up to a magnitude b$_{26.5}$=18.0 (the magnitudes are taken ... More
Properties of the galaxy population in hydrodynamical simulations of clustersSep 07 2006We present a study of the galaxy population predicted by hydrodynamical simulations for a set of 19 galaxy clusters based on the GADGET-2 Tree+SPH code. These simulations include gas cooling, star formation, a detailed treatment of stellar evolution and ... More
Fossil group origins X. Velocity segregation in fossil systemsJul 22 2019We want to study how the velocity segregation and the radial profile of the velocity dispersion depend on the prominence of the brightest cluster galaxies (BCGs). We divide a sample of 102 clusters and groups of galaxies into four bins of magnitude gap ... More
New Results on the Coma cluster: Revealing the Primary ComponentAug 31 1995Recent observations of the Coma cluster of galaxies in its central region have provided approximately 250 new redshifts - allowing a good membership criterion to be established for brighter galaxies - and magnitudes for 8000 objects in the same region ... More
The ESO Nearby Abell Cluster Survey: Kinematics of Galaxies in ClustersOct 30 1998We summarize several results based on the velocity data-set for cluster galaxies provided by ENACS (the ESO Nearby Abell Cluster Survey). We describe the distribution of velocity dispersions of a complete sample of rich galaxy clusters, and compare it ... More
The ESO Nearby Abell Cluster Survey. III. Distribution and Kinematics of Emission-Line GalaxiesOct 22 1996We have studied the frequency of occurrence, the kinematics and the spatial distribution of Emission-Line Galaxies (ELG) in clusters in the ESO Nearby Abell Cluster Survey (ENACS). More than 90% of the ELG are spirals, but the ELG represent only 30% of ... More
Environmental effects on the Coma cluster luminosity functionMay 31 1996Using our catalogue of V$_{26.5}$ isophotal magnitudes for 6756 galaxies in a region covering 60~$\times$~25~arcmin$^2$ in the center of the Coma cluster, plus 267 galaxies in a region of 9.7~$\times$~9.4~arcmin$^2$ around NGC~4839, we derive the luminosity ... More
Unveiling hidden structures in the Coma clusterDec 18 1995We have assembled a large data-set of 613 galaxy redshifts in the Coma cluster, the largest presently available for a cluster of galaxies. We have defined a sample of cluster members complete to b$_{26.5}=20.0$, using a membership criterion based on the ... More
The ESO Nearby Abell Cluster Survey. II. The Distribution of Velocity Dispersions of Rich Galaxy ClustersNov 13 1995Summary - By combining the 5634 redshifts from the ESO Nearby Abell Cluster Survey (the ENACS) with another 1000 redshifts from the literature we are able to study the distribution of velocity dispersions for a volume-limited sample of 128 $R_{\rm ACO} ... More
VGCF Detection of Galaxy Systems at Intermediate RedshiftAug 18 2005We continue the development of our Voronoi Galaxy Cluster Finder (VGCF) technique by applying it to galaxy catalogs obtained with B and R band observations of four high galactic latitude fields of 0.5x0.5 square degrees each. These fields are deep R_lim ... More
Clusters of galaxies in the mid-infraredJun 16 2004We describe the results of observations of galaxy clusters conducted with ISOCAM on-board the Infrared Space Observatory. Our research is aimed at understanding the processes driving galaxy evolution in dense environments, free from the bias of dust extinction. ... More
The Dynamical Status of the Cluster of Galaxies 1E0657-56Feb 18 2002We present the results of a new spectroscopic and photometric survey of the hot X-ray cluster 1E0657-56, at z=0.296. We determine the presence of a low velocity dispersion subcluster, which is offset from the main cluster position by 0.7 Mpc and about ... More
Constraining neutrino properties with a Euclid-like galaxy cluster surveyMar 19 2013Nov 07 2013We perform a forecast analysis on how well a Euclid-like photometric galaxy cluster survey will constrain the total neutrino mass and effective number of neutrino species. We base our analysis on the Monte Carlo Markov Chains technique by combining information ... More
Velocity segregation effects in galaxy clusters at 0.4<~z<~1.5Aug 24 2016Our study is meant to extend our knowledge of the galaxy color and luminosity segregation in velocity space (VCS and VLS, resp.), to clusters at intermediate and high redshift. Our sample is a collection of 41 clusters in the 0.4<~z<~1.5 redshift range, ... More
The ISOCAM/LW Detector Dark Current BehaviourOct 15 1999We describe the calibration, measurements and data reduction, of the dark current of the ISOCAM/LW detector. We point-out the existence of two significant drifts of the LW dark-current, one throughout the ISO mission, on a timescale of days, another within ... More
Internal dynamics of the radio--halo cluster A2219: a multi-wavelength analysisNov 21 2003We present the results of the dynamical analysis of the rich, hot, and X-ray very luminous galaxy cluster A2219, containing a powerful diffuse radio-halo. Our analysis is based on new redshift data for 27 galaxies in the cluster region, measured from ... More
Velocity Dispersions and X-Ray Temperatures of Galaxy ClustersJul 10 1995Jul 11 1995Using a large and well-controlled sample of clusters of galaxies, we investigate the relation between cluster velocity dispersions and X-ray temperatures of intra-cluster gas. In order to obtain a reliable estimate of the total velocity dispersion of ... More
Abell 315: reconciling cluster mass estimates from kinematics, X-ray, and lensingFeb 17 2017Determination of cluster masses is a fundamental tool for cosmology. Comparing mass estimates obtained by different probes allows to understand possible systematic uncertainties. The cluster Abell 315 is an interesting test case, since it has been claimed ... More
The mass profile of galaxy clusters out to ~2 r200Jan 22 2003We analyze the internal dynamics of 43 non-interacting clusters which are selected from the 2dF Galaxy Redshift Survey 100k public release. We join together the 43 clusters into an ensemble cluster by appropriately scaling their galaxy velocities and ... More
Intracluster light in clusters of galaxies at redshifts 0.4<z<0.8Sep 19 2011The study of intracluster light can help us to understand the mechanisms taking place in galaxy clusters, and to place constraints on the cluster formation history and physical properties. However, owing to the intrinsic faintness of ICL emission, most ... More
Galaxies in Present-day Clusters: Evolutionary Constraints from Their Distributions and KinematicsMay 05 2004We discuss evidence in local, present-day clusters of galaxies (from the ENACS survey) about the way in which those clusters have evolved and about the evolutionary relationships between the galaxies of different morphological types in them. This evidence ... More
Numerical simulations challenged on the prediction of massive subhalo abundance in galaxy clusters: the case of Abell 2142Jul 04 2016Aug 24 2016In this Letter we compare the abundance of member galaxies of a rich, nearby ($z=0.09$) galaxy cluster, Abell 2142, with that of halos of comparable virial mass extracted from sets of state-of-the-art numerical simulations, both collisionless at different ... More
The ESO Nearby Abell Cluster Survey. XIII. The orbits of the different types of galaxies in rich clustersJun 07 2004We study the orbits of the various types of galaxies observed in the ESO Nearby Abell Cluster Survey. Galaxies within and outside substructures are considered separately. We use the mass profile we determined from the distribution and kinematics of the ... More
New spectroscopic confirmations of high-redshift galaxy clustersSep 02 2005Sep 05 2005We present new spectroscopic data in the field of five high-redshift (z>=0.6) candidate galaxy clusters, drawn from the EIS Cluster Candidate Catalog. A total of 327 spectra were obtained using FORS1 at the VLT, out of which 266 are galaxies with secure ... More
Deep ISOCAM Observations of Abell 2218Mar 13 1998We report on the mid-infrared imaging at 5, 7, 10 and 15 microns of the galaxy cluster Abell 2218 obtained with the ISOCAM instrument onboard ESA's Infrared Space Observatory (ISO), as part of an on-going program to image gravitational arcs and arclets ... More
The dynamics of z~1 clusters of galaxies from the GCLASS surveyMay 20 2016Jul 26 2016We constrain the internal dynamics of a stack of 10 clusters from the GCLASS survey at 0.87<z<1.34. We determine the stack cluster mass profile M(r) using the MAMPOSSt algorithm of Mamon et al., the velocity anisotropy profile beta(r) from the inversion ... More
The galaxy cluster mass scale and its impact on cosmological constraints from the cluster populationFeb 27 2019The total mass of a galaxy cluster is one of its most fundamental properties. Together with the redshift, the mass links observation and theory, allowing us to use the cluster population to test models of structure formation and to constrain cosmological ... More
The Rest-frame $H$-band Luminosity Function of Red Sequence Galaxies in Clusters at $1.0 < z < 1.3$Jun 25 2019Jul 11 2019We present results on the rest-frame $H$-band luminosity functions (LF) of red sequence galaxies in seven clusters at 1.0 < z < 1.3 from the Gemini Observations of Galaxies in Rich Early Environments Survey (GOGREEN). Using deep GMOS-z' and IRAC $3.6 ... More
Enhanced cluster lensing models with measured galaxy kinematicsMay 30 2019We present improved mass models of three CLASH/HFF massive clusters, MACS J1206.2-0847, MACS J0416.1-0403, Abell S1063. We reconstruct the subhalo mass component with robust stellar kinematics of cluster galaxies, coupled with precise strong lensing models ... More
Mass Calibration of the CODEX Cluster Sample using SPIDERS Spectroscopy - I. The Richness-Mass RelationDec 14 2018We use galaxy dynamical information to calibrate the richness-mass scaling relation of a sample of 428 galaxy clusters that are members of the CODEX sample with redshifts up to z~0.7. These clusters were X-ray selected using the ROSAT All-Sky Survey (RASS), ... More
GASP. V. Ram-pressure stripping of a ring Hoag's-like galaxy in a massive clusterFeb 20 2018Through an ongoing MUSE program dedicated to study gas removal processes in galaxies (GAs Stripping Phenomena in galaxies with MUSE, GASP), we have obtained deep and wide integral field spectroscopy of the galaxy JO171. This galaxy resembles the Hoag's ... More
Mass Calibration of the CODEX Cluster Sample using SPIDERS Spectroscopy -- I. The Richness-Mass RelationDec 14 2018Jun 11 2019We use galaxy dynamical information to calibrate the richness-mass scaling relation of a sample of 428 galaxy clusters that are members of the CODEX sample with redshifts up to z~0.7. These clusters were X-ray selected using the ROSAT All-Sky Survey (RASS), ... More
The concentration-mass relation of clusters of galaxies from the OmegaWINGS surveyAug 24 2017The relation between a cosmological halo concentration and its mass (cMr) is a powerful tool to constrain cosmological models of halo formation and evolution. On the scale of galaxy clusters the cMr has so far been determined mostly with X-ray and gravitational ... More
OmegaWINGS: The first complete census of post starburst galaxies in clusters in the local universeMar 09 2017Galaxies that abruptly interrupt their star formation in < 1.5 Gyr present recognizable features in their spectra (no emission and Hd in absorption) and are called post starburst (PSB) galaxies. By studying their stellar population properties and their ... More
CLASH-VLT: constraints on $f(R)$ gravity models with galaxy clusters using lensing and kinematic analysesMay 15 2017Jul 30 2017We perform a maximum likelihood kinematic analysis of the two dynamically relaxed galaxy clusters MACS J1206.2-0847 at $z=0.44$ and RXC J2248.7-4431 at $z=0.35$ to determine the total mass profile in modified gravity models, using a modified version of ... More
Enhanced cluster lensing models with measured galaxy kinematicsMay 30 2019Jun 03 2019We present improved mass models of three CLASH/HFF massive clusters, MACS J1206.2-0847, MACS J0416.1-0403, Abell S1063. We reconstruct the subhalo mass component with robust stellar kinematics of cluster galaxies, coupled with precise strong lensing models ... More
Very deep spectroscopy of the Coma cluster line of sight: exploring new territoriesJun 24 2009Environmental effects have an important influence on cluster galaxies, but studies at very faint magnitudes (R>21) are almost exclusively based on imaging. We present here a very deep spectroscopic survey of galaxies on the line of sight to Coma, based ... More
Optically-selected clusters at 0.8 < z < 1.3 in the EIS Cluster SurveyJun 03 2002This paper presents preliminary results of a spectroscopic survey being conducted at the VLT of fields with optically-selected cluster candidates identified in the EIS I-band survey. Here we report our findings for three candidates selected for having ... More
Spectroscopic confirmation of clusters from the ESO imaging surveyMay 26 2000We measure redshifts for 67 galaxies in the field of six cluster candidates from the ESO Imaging Survey (EIS). The cluster candidates are selected in the EIS patches C and D among those with estimated mean redshifts between 0.5 and 0.7. The observations ... More
Mass profile decomposition of the Frontier Fields cluster MACS J0416-02403. Insights on the Dark-Matter inner profileNov 06 2017We present a high resolution dissection of the two-dimensional total mass distribution in the core of the Hubble Frontier Fields galaxy cluster MACS J0416.1-2403, at z ~ 0.396. We exploit HST/WFC3 near-IR (F160W) imaging, VLT/MUSE spectroscopy, and Chandra ... More
Luminosity functions in the CLASH-VLT cluster MACS J1206.2-0847: the importance of tidal interactionsOct 27 2015We present the optical luminosity functions (LFs) of galaxies for the CLASH-VLT cluster MACS J1206.2-0847 at z=0.439, based on HST and SUBARU data, including ~600 spectroscopically confirmed member galaxies. The LFs on the wide SUBARU FoV are well described ... More
Starbursting Brightest Cluster Galaxy: a Herschel view of the massive cluster MACS J1931.8-2634Nov 10 2015We investigate the dust-obscured star formation properties of the massive, X-ray selected galaxy cluster MACS J1931.8-2634 at $z$=0.352. Using far-infrared (FIR) imaging in the range 100-500$\mu$m obtained with the \textit{Herschel} telescope, we extract ... More
An ISOCAM survey through gravitationally lensing galaxy clusters. III. New results from mid-infrared observations of th e cluster Abell 2219Oct 01 2004Oct 20 2006The massive cluster of galaxies Abell 2219 (z = 0.228) was observed at 14.3 $\mu$m with the Infrared Space Observatory and results were published by Barvainis et al. (1999). These observations have been reanalyzed using a method specifically designed ... More
An ISOCAM Mid-IR Survey through Gravitationally Lensing Galaxy ClustersOct 18 1999We present imaging results and source counts from a deep ISOCAM cosmological survey at 15 microns, through gravitationally lensing galaxy clusters. We take advantage of the cluster gravitational amplification to increase the sensitivity of our survey. ... More
An ultra-deep ISOCAM observation through a cluster-lensOct 29 1998We present results of ultra-deep ISOCAM observations through a cluster-lens at 7 and 15 micron with the Infrared Space Observatory (ISO) satellite. These observations reveal a large number of luminous Mid-Infrared (MIR) sources. Cross-identification in ... More
On the Nature of the EIS Candidate Clusters: Confirmation of z<0.6 candidatesOct 21 2001We use public V-band imaging data from the wide-angle surveys conducted by the ESO Imaging Survey project (EIS) to further investigate the nature of the EIS galaxy cluster candidates. These were originally identified by applying a matched-filter algorithm ... More
Confirming EIS Clusters. Multi-object SpectroscopyOct 26 1999Using EFOSC2 at the 3.6m ESO telescope, we obtained redshifts for 68 galaxies in the field of six cluster candidates from the ESO Imaging Survey (EIS). The cluster candidates were selected in the EIS patches C and D and have estimated mean redshifts between ... More
Confirming EIS Clusters. Optical and Infrared ImagingOct 25 1999Clusters of galaxies are important targets in observationally cosmology, as they can be used both to study the evolution of the galaxies themselves and to constrain cosmological parameters. Here we report on the first results of a major effort to build ... More
Structural and dynamical modeling of WINGS clusters. I. The distribution of cluster galaxies of different morphological classes within regular and irregular clustersAug 28 2017[Abridged] We use the WINGS database to select a sample of 67 nearby galaxy clusters with at least 30 spectroscopic members each. 53 of these clusters do not show evidence of substructures in phase-space, while 14 do. We estimate the virial radii and ... More
A Deep and Ultra-deep ISOCAM Cosmological Survey through Gravitationally Lensing Clusters of GalaxiesJan 12 1999Jan 25 1999We present imaging results and source counts from an ISOCAM deep and ultra-deep cosmological survey through gravitationally lensing clusters of galaxies at 7 and 15 microns. A total area of about 53 sq.arcmin was covered in maps of three clusters. The ... More
The origin of X-ray emission of two distant (z>1) cluster candidate with XMM-NewtonApr 23 2003We present here a study of XMM-Newton data of two distant galaxy cluster candidates. One of these was discovered serendipitously in near infrared data, CL J0533-2411, the other one corresponds to the cluster EIS J0533-2412 part of the EIS cluster survey. ... More
Mass, velocity anisotropy, and pseudo phase-space density profiles of Abell 2142Nov 05 2013Apr 21 2015Aim: We aim to compute the mass and velocity anisotropy profiles of Abell 2142 and, from there, the pseudo phase--space density profile $Q(r)$ and the density slope - velocity anisotropy $\beta - \gamma$ relation, and then to compare them with theoretical ... More
The ESO Nearby Abell Cluster Survey. XII. The mass and mass-to-light-ratio profiles of rich clustersOct 02 2003We determine the mass profile of an ensemble cluster built from 3056 galaxies in 59 nearby clusters observed in the ESO Nearby Abell Cluster Survey. The mass profile is derived from the distribution and kinematics of the Early-type (elliptical and S0) ... More
Constraining the galaxy mass content in the core of A383 using velocity dispersion measurements for individual cluster membersNov 28 2014We use velocity dispersion measurements of 21 individual cluster members in the core of Abell 383, obtained with MMT Hectospec, to separate the galaxy and the smooth dark halo (DH) lensing contributions. While lensing usually constrains the overall, projected ... More
The red-sequence of 72 WINGS local galaxy clustersSep 19 2011We study the color-magnitude red sequence and blue fraction of 72 X-ray selected galaxy clusters at z=0.04-0.07 from the WINGS survey, searching for correlations between the characteristics of the red sequence and the environment. We consider the slope ... More
An unusual iron Lo-BAL quasar detected by ISOCAMMay 02 2002We report the discovery of an unusual low--ionization broad absorption line quasar at z=1.776 which exhibits absorption lines from many excited states of Feii. This member of the rare class of 'FeLoBAL' quasars was serendipitously found in a mid-infrared ... More
Combining Strong Lensing and Dynamics in Galaxy Clusters: integrating MAMPOSSt within LENSTOOL I. Application on SL2S J02140-0535Aug 12 2016We present a new framework were we simultaneously fit strong lensing (SL) and dynamical data. The SL analysis is based on LENSTOOL, and the dynamical analysis uses MAMPOSSt code, which we have integrated into LENSTOOL. After describing the implementation ... More
CLASH-VLT: Testing the Nature of Gravity with Galaxy Cluster Mass ProfilesFeb 10 2016We use high-precision kinematic and lensing measurements of the total mass profile of the dynamically relaxed galaxy cluster MACS J1206.2-0847 at $z=0.44$ to estimate the value of the ratio $\eta=\Psi/\Phi$ between the two scalar potentials in the linear ... More
Substructures in WINGS clustersApr 04 2007We search for and characterize substructures in the projected distribution of galaxies observed in the wide field CCD images of the 77 nearby clusters of the WIde-field Nearby Galaxy-cluster Survey (WINGS). This sample is complete in X-ray flux in the ... More
Morphological Fractions of Galaxies in WINGS Clusters: revisiting the Morphology-Density ParadigmMar 04 2015Mar 05 2015We present the Morphology-Density and Morphology-Radius relations (T-Sigma and T-R, respectively) obtained from the WINGS database of galaxies in nearby clusters. Aiming to achieve the best statistics, we exploit the whole sample of galaxies brighter ... More
WINGS-SPE Spectroscopy in the WIde-field Nearby Galaxy-cluster SurveyDec 10 2008Aims. We present the results from a comprehensive spectroscopic survey of the WINGS (WIde-field Nearby Galaxy-cluster Survey) clusters, a program called WINGS-SPE. The WINGS-SPE sample consists of 48 clusters, 22 of which are in the southern sky and 26 ... More