Amata Mercurio

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We present the structural parameters (half light radius re, mean surface brightness <μ>e within re and Sersic index n) in the R, I and K bands for N ∼ 60 galaxies in the cluster A 2163B at z ∼ 0.2. The structural parameters are used to estimate the internal colour gradients of bulge–dominated (n > 2) galaxies. For the first time, we perform a comparative(More)
We present a joint shear-and-magnification weak-lensing analysis of a sample of 16 X-ray-regular and 4 high-magnification galaxy clusters at 0.19 < ∼ z < ∼ 0.69 selected from the Cluster Lensing And Supernova survey with Hubble (CLASH). Our analysis uses wide-field multi-color imaging, taken primarily with Suprime-Cam on the Subaru Telescope. From a stacked(More)
We present the Capodimonte Deep Field (OACDF), a deep field covering an area of 0.5 deg in the B, V , R optical bands plus six medium-band filters in the wavelength range 773–913 nm. The field reaches the following limiting magnitudes: BAB ∼ 25.3, VAB ∼ 24.8 and RAB ∼ 25.1 and contains ∼ 50000 extended sources in the magnitude range 18 ≤ RAB ≤ 25.0. Hence,(More)
Supernova “Refsdal,” multiply imaged by cluster MACS1149.5+2223, represents a rare opportunity to make a true blind test of model predictions in extragalactic astronomy, on a timescale that is short compared to a human lifetime. In order to take advantage of this event, we produced seven gravitational lens models with five independent methods, based on(More)
We present an overview of a multiwavelength survey of the Shapley Supercluster (SSC; z ∼ 0.05) covering a contiguous area of 260 h−2 70 Mpc2 including the supercluster core. The projectmain aim is to quantify the influence of cluster-scalemass assembly on galaxy evolution in one of the most massive structures in the local Universe. The Shapley Supercluster(More)
We present an analysis of star-formation and nuclear activity in galaxies as a function of both luminosity and environment in the fourth data release of the Sloan Digital Sky Survey (SDSS DR4). Using a sample of 27 753 galaxies in the redshift range 0.005<z<0.037 that is &90% complete to Mr = −18.0 we find that the EW(Hα) distribution is strongly bimodal,(More)
We examine the environmental effects on the photometric properties of galaxies for the rich galaxy cluster ABCG 209 at z = 0.209. We use archive CFHT optical imaging of a 42× 28 arcmin field centred on the cluster to produce a galaxy sample complete to B = 25.0 and R = 24.5. Both the composite and red sequence galaxy luminosity functions are found to be(More)
We present an analysis of the effects of environment on the photometric properties of galaxies in the core of the Shapley Supercluster at z = 0.05, one of the most massive structures in the local universe. The Shapley Optical Survey (SOS) comprises archive WFI optical imaging of a 2.0 deg region containing the rich clusters A3556, A3558 and A3562 which(More)
Aims. In the effort to understand the link between the structure of galaxy clusters and their galaxy populations, we focus on MACS J1206.2-0847 at z ∼ 0.44 and probe its substructure in the projected phase space through the spectrophotometric properties of a large number of galaxies from the CLASH-VLT survey. Methods. Our analysis is mainly based on an(More)