
Tiziano ValentinuzziUniversity of Padua | UNIPD · Department of Physics and Astronomy "Galileo Galilei"
Tiziano Valentinuzzi
Master of Science
Associate researcher at Bhaktivedanta Institue for Higher Sciences
About
41
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Introduction
Publications
Publications (41)
Aims. We present the B, V, and K band surface photometry catalogs obtained by running the automatic software GASPHOT on galaxies from the WINGS cluster survey with isophotal areas larger than 200 pixels. The catalogs can be downloaded at the Centre de Donnees Astronomiques de Strasbourg.
Methods. The luminosity growth curves of stars and galaxies...
Context. To effectively investigate galaxy formation and evolution, it is of paramount importance to exploit homogeneous data for large samples of galaxies in different environments.
Aims. The WIde-field Nearby Galaxy-cluster Survey (WINGS) project aim is to evaluate physical properties of galaxies in a complete sample of low redshift clusters to...
We compare the number density of compact (small size) massive galaxies at low
and high redshift using our Padova Millennium Galaxy and Group Catalogue
(PM2GC) at z=0.03-0.11 and the CANDELS results from Barro et al. (2013) at
z=1-2. The number density of local compact galaxies with luminosity weighted
(LW) ages compatible with being already passive...
We present a study of galaxy sizes in the local Universe as a function of
galaxy environment, comparing clusters and the general field. Galaxies with
radii and masses comparable to high-z massive and compact galaxies represent
4.4% of all galaxies more massive than 3 X 10^{10} M_sun in the field. Such
galaxies are 3 times more frequent in clusters...
We search for massive and compact galaxies (superdense galaxies, hereafter
SDGs) at z=0.03-0.11 in the Padova-Millennium Galaxy and Group Catalogue, a
spectroscopically complete sample representative of the local Universe general
field population. We find that compact galaxies with radii and mass densities
comparable to high-z massive and passive g...
Morphological types for 39923 galaxies in 76 clusters of the WINGS
survey are presented. The morphology has been mostly estimated using the
automatic tool MORPHOT, while for ~3000 galaxies visual estimates are
also provided.
For each galaxy we give a Maximum Likelihood, a Neural Network and a
final estimate of the morphological type, together with...
We 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 and scatter of the red sequence, the number
ratio of red luminous-to-faint galaxies, the blue fra...
We present the morphological catalog of galaxies in nearby clusters of the WINGS survey (Fasano et al. 2006). The catalog contains a total number of 39923 galaxies, for which we provide the automatic estimates of the morphological type applying the purposely devised tool MORPHOT to the V-band WINGS imaging. For ~3000 galaxies we also provide visual...
The sample of galaxies analyzed in this paper consists of spectroscopic
early-type objects. We considered the flux-calibrated spectra reduced in
Halliday et al. (2004, Cat. J/A+A/427/397) and Milvang-Jensen et al.
(2008, Cat. J/A+A/482/419) of galaxies with early spectral type (1 or
2).
(3 data files).
We present the galaxy stellar mass function (MF) and its evolution in clusters from z~0.8 to the current epoch, based on the WIde-field Nearby Galaxy-cluster Survey (WINGS) (0.04<z<0.07), and the ESO Distant Cluster Survey (EDisCS) (0.4<z <0.8). We investigate the total MF and find it evolves noticeably with redshift. The shape at M*>10^11 M' does...
Context. The WIde-field Nearby Galaxy clusters Survey (wings) is a project whose primary goal is to study the galaxy populations in clusters in the local universe (z lt 0.07) and of the influence of environment on their stellar populations. This survey has provided the astronomical community with a high quality set of photometric and spectroscopic...
We report on the discovery of a relation between the stellar mass M* of early-type galaxies (hereafter ETGs), their shape, as parameterized by the Sersic index n, and their stellar mass-to-light ratio M*/L. In a three-dimensional log space defined by these variables, the ETGs populate a plane surface with small scatter. This relation tells us that...
We present the ellipticity distribution and its evolution for early-type galaxies in clusters from ztilde 0.8 to the current epoch, based on the WIde-field Nearby Galaxy-cluster Survey (0.04 lezle 0.07) and the ESO Distant Cluster Survey (0.4 lezle 0.8). We first investigate a mass-limited sample and we find that above a fixed mass limit (M$_*$ge 1...
We present the ellipticity distribution and its evolution for early-type galaxies in clusters from z∼ 0.8 to the current epoch, based on the WIde-field Nearby Galaxy-cluster Survey (0.04 ≤z≤ 0.07) and the ESO Distant Cluster Survey (0.4 ≤z≤ 0.8). We first investigate a mass-limited sample and we find that above a fixed mass limit (M*≥ 1010.2 M⊙), t...
We study the evolution of spectral early-type galaxies in clusters,
groups, and the field up to redshift 0.9 using the ESO Distant Cluster
Survey (EDisCS) dataset. We measure structural parameters (circularized
half-luminosity radii Re, surface brightness Ie,
and velocity dispersions σ) for 154 cluster and 68 field galaxies.
On average, we achieve...
Total stellar mass, stellar mass as a function of age, luminosity- and mass-weighted ages, and dust extinction values are presented for 5299 galaxies in 48 nearby galaxy clusters. Galaxies in the following clusters have been observed: A1069, A119, A151, A160, A193, A1291, A1631a, A1644, A1795, A1831, A1983, A1991, A2107, A2124, A2169, A2382, A2399,...
We find a significant number of massive and compact galaxies in clusters from the ESO Distant Clusters Survey (EDisCS) at 0.4 < z < 1. They have similar stellar masses, ages, sizes, and axial ratios to local z ~ 0.04 compact galaxies in WIde field Nearby Galaxy clusters Survey (WINGS) clusters, and to z = 1.4-2 massive and passive galaxies found in...
On May 27th 2010, the Italian astronomical community learned with concern that the National Institute for Astrophysics (INAF) was going to be suppressed, and that its employees were going to be transferred to the National Research Council (CNR). It was not clear if this applied to all employees (i.e. also to researchers hired on short-term contract...
Tidal interactions between neighboring objects span across the whole admissible range of lengths in nature: from, say, atoms to clusters of galaxies i.e. from micro to macrocosms. According to current cosmological theories, galaxies are embedded within massive non-baryonic dark matter (DM) halos, which affects their formation and evolution. It is t...
We compare the apparent axial ratio distributions of Brightest Cluster
Galaxies (BCGs) and normal ellipticals (Es) in our sample of 75 galaxy clusters
from the WINGS survey. Most BCGs in our clusters (69%) are classified as cD
galaxies. The sample of cDs has been completed by 14 additional cDs (non-BCGs)
we found in our clusters. We find that: (i)...
Photometric parameters in the J,K near-infrared filters are presented for 28 nearby galaxy clusters. (2 data files).
Massive quiescent galaxies at z > 1 have been found to have small physical sizes, and hence to be superdense. Several mechanisms, including minor mergers, have been proposed for increasing galaxy sizes from high- to low-z. We search for superdense massive galaxies in the WIde-field Nearby Galaxy-cluster Survey (WINGS) of X-ray selected galaxy clust...
We quantify the evolution of the spiral, S0 and elliptical fractions in galaxy clusters as a function of cluster velocity dispersion (σ) and X-ray luminosity (LX ) using a new database of 72 nearby clusters from the Wide-Field Nearby Galaxy-Cluster Survey (WINGS) combined with literature data at z = 0.5-1.2. Most WINGS clusters have σ between 500 a...
This is the second paper of a series devoted to the WIde Field Nearby Galaxy-cluster Survey (WINGS). WINGS is a long term project which is gathering wide-field, multi-band imaging and spectroscopy of galaxies in a complete sample of 77 X-ray selected, nearby clusters (0.04200deg). The main goal of this project is to establish a local reference for...
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 in the north. The main goals of this spectroscopic survey are: (1) to study the dynamics and kinematics...
Context. This is the third paper of a series devoted to the WIde-field Nearby Galaxy-cluster Survey (WINGS).WINGS is a long term project aimed at gathering wide-field, multiband imaging and spectroscopy of galaxies in a complete sample of 77 X-ray selected nearby clusters (0.04<z<0.07) located far from the galactic plane (b>20deg). The main goal of...
(Abridged) Context. This is the second paper of a series devoted to the WIde Field Nearby Galaxy-cluster Survey (WINGS). WINGS is a long term project which is gathering wide-field, multi-band imaging and spectroscopy of galaxies in a complete sample of 77 X-ray selected, nearby clusters (0.04<z<0.07) located far from the galactic plane (|b|>=20deg)...
(Abridged) Context. This is the second paper of a series devoted to the WIde Field Nearby Galaxy-cluster Survey (WINGS). WINGS is a long term project which is gathering wide-field, multi-band imaging and spectroscopy of galaxies in a complete sample of 77 X-ray selected, nearby clusters (0.04<z<0.07) located far from the galactic plane (|b|>=20deg)...
Aims. 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 in the north. The main goals of this spectroscopic survey are: (1) to study the dynamics and kine...
Two-component systems are conceived as macrogases, and the related equation of state is expressed using the virial theorem for subsystems, under the restriction of homeoidally striated density profiles. Explicit calculations are performed for a useful reference case and a few cases of astrophysical interest, both with and without truncation radius....
The presence of a dark halo around elliptical galaxies may induce a scale length on the luminous component trough the appearance of a maximum in the Clausius Virial (CV) potential energy (Secco 2000, 2001). The problem of how the CV maximum can be relevant to determine the observed elliptical galaxies properties is still open. Here we present a pre...
To test the extension of the theory of the Fundamental Plane (FP) proposed by Secco (2000, 2001, 2005) to an higher order (non-linear) we explore the effect on an homogeneous stellar component due to a DM halo with a density profile characterized by an inner slope free and an outer slope -3, according to high resolution RCs of Sps (Garrido et al.,...
As found in Secco (2000, 2001), the presence of a (non-baryonic) dark halo in large-scale celestial objects, can induce a scale length on the luminous spheroid through the occurrence of an unexpected maximum in the virial potential energy (Clausius Virial, CV). The above mentioned investigations were grounded on two cored power law density profiles...
We present a panoramic review of several observational and theoretical aspects of the modern astrophysical research about the origin of the fundamental plane (FP) relation for early-type galaxies (ETGs). The discussion is focused on the problem of the tilt and the tightness of the FP, and on the attempts to derive the luminosity evolution of ETGs w...
We present a panoramic review of several observational and theoretical aspects of the modern astrophysical research about the origin of the Fundamental Plane (FP) relation for Early-Type Galaxies (ETGs). The discussion is focused on the problem of the tilt and the tightness of the FP, and on the attempts to derive the luminosity evolution of ETGs w...
Analytical and geometrical properties of generalized power-law (GPL) density profiles are investigated in detail. In particular, a one-to-one correspondence is found between mathematical parameters and geometrical parameters. Then GPL density profiles are compared with simulated dark haloes (SDH) density profiles, and nonlinear least-absolute value...
We present results of an extensive photometric monitoring campaign of
the peculiar emission star MWC 560 that covers the range 1990-1995. The
time interval corresponds to the length of the proposed orbital period
of this highly peculiar binary, which attracted considerable interest in
January-April 1990, when absorption components, shifted by -6000...
We present results of an extensive photometric monitoring campaign of the peculiar emission star MWC 560 that covers the range 1990-1995. The time interval corresponds to the length of the proposed orbital period of this highly peculiar binary, which attracted considerable interest in January-April 1990, when absorption components, shifted by -6000...
Context. This is the third paper of a series devoted to the WIde-field Nearby Galaxy-cluster Survey(WINGS). WINGS is a long term project aimed at gathering wide-field, multiband imaging an d spectroscopy of galaxies in a complete sample of 77 X-ray selected, nearby clusters (0.04