A5053284961- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Remote Sensing in Agriculture
- Adaptive optics and wavefront sensing
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Impact of Light on Environment and Health
- Astrophysics and Star Formation Studies
- CCD and CMOS Imaging Sensors
- Scientific Research and Discoveries
- History and Developments in Astronomy
- Geophysics and Gravity Measurements
- Advanced Vision and Imaging
- Advanced Fluorescence Microscopy Techniques
- Spectroscopy and Laser Applications
- Astrophysical Phenomena and Observations
- Solar and Space Plasma Dynamics
- Astrophysics and Cosmic Phenomena
- Advanced optical system design
- Calibration and Measurement Techniques
- Optical Systems and Laser Technology
- Astro and Planetary Science
- Statistical and numerical algorithms
- Solar Radiation and Photovoltaics
National Institute for Astrophysics
2007-2024
Collurania Teramo Observatory
2014-2023
Netherlands Institute for Radio Astronomy
2022
Max Planck Institute for Astronomy
2018
Max Planck Society
2018
Astronomical Observatory of Capodimonte
2016-2017
European Southern Observatory
2016
University of Rome Tor Vergata
2009
Washington State University
2006-2008
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
2003-2005
Abstract The detection of the accelerated expansion Universe has been one major breakthroughs in modern cosmology. Several cosmological probes (Cosmic Microwave Background, Supernovae Type Ia, Baryon Acoustic Oscillations) have studied depth to better understand nature mechanism driving this acceleration, and they are being currently pushed their limits, obtaining remarkable constraints that allowed us shape standard model. In parallel that, however, percent precision achieved recently...
ABSTRACT We have started a new, deep multi-imaging survey of the Fornax cluster, dubbed Deep Survey (FDS), at VLT Telescope (VST). In this paper we present photometry inside two square degrees around bright galaxy NGC 1399 in core cluster. found that cluster is characterized by very extended and diffuse envelope surrounding luminous 1399: map surface brightness out to 33 arcmin (∼192 kpc) from center down μ g ∼ 31 mag arcsec −2 band. The allows us detect faint stellar bridge intracluster...
Context. Studies of low surface brightness (LSB) galaxies in nearby clusters have revealed a sub-population extremely diffuse with central μ0,g′ > 24 mag arcsec-2, total luminosity Mg′ fainter than −16 and effective radius between 1.5 kpc <Re < 10 kpc. The origin these ultra (UDGs) is still unclear, although several theories been suggested. As the UDGs overlap dwarf-sized their luminosities, it important to compare properties same environment. If continuum found rest LSB population, would be...
Abstract Using deep, high-resolution optical imaging from the Next Generation Virgo Cluster Survey, we study properties of nuclear star clusters (NSCs) in a sample nearly 400 quiescent galaxies core with stellar masses 10 5 ≲ <?CDATA ${\text{}}{M}_{* }$?> / ${\text{}}{M}_{\odot 12 . The nucleation fraction reaches peak value f n ≈ 90% for 9 and declines both higher lower masses, but nuclei populate as small × Comparison literature data nearby groups shows that at low-mass end is more...
The Fornax Deep Survey (FDS), an imaging survey in the u', g', r', and i'-bands, has a supreme resolution image depth compared to previous spatially complete Cluster Catalog (FCC). Our new data allows us study galaxies down r'-band magnitude m$_{r'}\approx$21 mag (M$_{r'}\approx$-10.5 mag). These provide important legacy dataset cluster. We aim present (FDS) dwarf galaxy catalog, focusing on explaining reduction calibrations, assessing quality of data, describing methods used for defining...
Abstract As part of the Fornax Deep Survey with ESO VLT Telescope, we present new g - and r -band mosaics SW group Cluster. It covers an area 3 × 2 square degrees around central galaxy NGC 1316. The deep photometry, high spatial resolution OmegaCam, large covered allow us to study structure, trace stellar halo formation, look at environment. We map surface brightness profile out 33′ (∼200 kpc ∼ 15 R e ) from center, down <?CDATA ${\mu }_{g}\sim 31\,\mathrm{mag}$?> arcsec −2 }_{r}\sim...
This paper focuses on a class of galaxies characterised by an extremely low surface brightness: ultra-diffuse (UDGs). We used new integral-field (IF) spectroscopic data, obtained with the ESO Large Programme Looking into faintEst WIth MUSE (LEWIS). It provides first homogeneous IF survey performed at Very Telescope complete sample UDGs and low-surface-brightness within virial radius 0.4 in Hydra I cluster, according to UDG abundance-halo mass relation. Our main goals are addressing possible...
Abstract The Virgo Cluster is the nearest substantial cluster of galaxies to Milky Way and a cornerstone extragalactic distance scale. Here, we present JWST/NIRCam observations that simultaneously cover cores halos 10 in around are designed perform simultaneous measurements tip red giant branch (TRGB) surface brightness fluctuations (SBF). Seven targets within where able resolve some cluster’s substructure, while an additional three provide important constraints on infall. seven itself all...
We report the discovery of a complex extended density enhancement in Globular Clusters (GCs) central $\sim 0.5(^{\circ})^2$ ($\sim 0.06$ Mpc$^2$) Fornax cluster, corresponding to 50\%$ area within 1 core radius. This overdensity connects GC system NGC1399 most those neighboring galaxies 0.6^{\circ}$ 210$ kpc) along W-E direction. The asymmetric structure suggests that cluster experienced lively history interactions have left clear imprint on spatial distribution GCs. dominant is more...
We present the VST Early-type GAlaxy Survey (VEGAS), which is designed to obtain deep multiband photometry in g, r, i, of about one hundred nearby galaxies down 27.3, 26.8, and 26 mag/arcsec^2 respectively, using ESO facility VST/OmegaCAM. The goals survey are 1) map light distribution up ten effective radii, r_e, 2) trace color gradients surface brightness fluctuation out a few r_e for stellar population characterization, 3) full census satellite systems (globular clusters dwarf galaxies)...
Abstract In the core of Fornax cluster, on west side NGC 1399, we have detected a previously unknown region intracluster light (ICL). It is made up by several faint ( <?CDATA ${\mu }_{r}\simeq 28\mbox{--}29$?> mag arcsec −2 ) patches diffuse light. The bulk ICL located in between three bright galaxies core, 1387, 1379, and 1381, at $10\leqslant R\leqslant 40$?> arcmin (∼58–230 kpc) from central galaxy 1399. We show that counterpart known over-density population blue globular clusters (GCs)....
Abstract The joint detection of gravitational waves (GWs) and electromagnetic radiation from the binary neutron star (BNS) merger GW170817 has provided unprecedented insight into a wide range physical processes: heavy element synthesis via r -process; production relativistic ejecta; equation state stars nature remnant; coalescence timescale; measurement Hubble constant “standard siren” technique. In detail, all these results depend on distance to host galaxy event, NGC 4993. this Letter we...
The halo masses Mhalo of low surface brightness (LSB) galaxies are critical measurements for understanding their formation processes. One promising method to estimate a galaxy's is exploit the empirical scaling relation between and number associated globular clusters (NGC). We use Bayesian mixture model approach measure NGC 175 LSB [23 ≤ 〈μe,r〉 (mag arcsec−2) 28] in Fornax cluster using Deep Survey data; this largest sample low-mass so-far analysed kind study. proximity means that we can...
Observations of diffuse starlight in the outskirts galaxies are thought to be a fundamental source constraints on cosmological context galaxy assembly $Λ$CDM model. Such observations not trivial because extreme faintness such regions. In this work, we investigate photometric properties six massive early type (ETGs) VEGAS sample (NGC 1399, NGC 3923, 4365, 4472, 5044, and 5846) out extremely low surface brightness levels, with goal characterizing global structure their light profiles for...
Context . Dwarf galaxies are the most common type of in galaxy clusters. Due to their low mass, they more vulnerable environmental effects than massive galaxies, and thus optimal for studying environment on evolution. By comparing properties dwarf with different masses, morphological types, cluster-centric distances we can obtain information about physical processes clusters that play a role evolution these objects shape properties. The Fornax Deep Survey Catalog (FDSDC) includes 564 cluster...
Abstract The Next Generation Virgo Cluster Survey (NGVS) was designed to provide a deep census of baryonic structures in the cluster. survey covers 104 deg 2 area from core out one virial radius, u * griz bandpasses, point-source depth g ∼ 25.9 mag (10 σ ) and single pixel surface brightness limit μ 29 arcsec −2 (2 above sky). Here we present final catalog 404 galaxies located within 3.71 (0.3 Mpc region centered on M87, Virgo’s dominant galaxy. Of these, 154 were previously uncataloged span...
This work is based on deep multi-band (g, r, i) data from the Fornax Deep Survey with VST. We analyse surface brightness profiles of 19 bright ETGs inside virial radius cluster. The main aim this to identify signatures accretion onto galaxies by studying presence outer stellar halos, and understand their nature occurrence. Our analysis also provides a new accurate estimate intra-cluster light Fornax. performed multi-component fits azimuthally averaged available for all sample galaxies....
In this work, we extend the catalog of low-surface brightness (LSB) galaxies, including ultra-diffuse galaxy (UDG) candidates, within ≈0.4 R vir Hydra I cluster galaxies based on deep images from VST Early-type GAlaxy Survey (VEGAS). The new were found by applying an automatic detection tool and carrying out additional visual inspections g r band images. This led to 11 UDGs 8 more LSB galaxies. For all them, assessed membership using color–magnitude relation derived for early-type giant...
Context. Low surface brightness (LSB) dwarf galaxies in galaxy clusters are an interesting group of objects as their contribution to the luminosity function and evolutionary paths not yet clear. Increasing completeness our catalogs is crucial for understanding these galaxies, which have effective brightnesses below 23 mag arcsec −2 (in optical). Progress continuously being made via performance deep observations, but detection depth quantification can also be improved application novel...
In this Letter, we revisit the relationship between fraction of intra-cluster light (ICL) as well virial mass and early-type galaxies in host halo. This exploration is based on a statistically significant homogeneous sample 22 groups clusters Local Universe ( z ≤ 0.05), obtained with VST Early-type GAlaxy Survey (VEGAS). Taking advantage long integration time large area VEGAS images, are able to map galaxy outskirts ICL down μ g ≥ 29–30 mag arcsec −2 out hundreds kpc. With data set, have...
Abstract The surface brightness fluctuation (SBF) method is a robust and efficient way of measuring distances to galaxies containing evolved stellar populations. Although many recent applications the have used space-based imaging, SBF remains powerful technique for ground-based telescopes. Deep, wide-field imaging surveys with subarcsecond seeing enable measurements numerous nearby galaxies. Using preliminary calibration, Cantiello et al. presented 89 bright, mainly early-type observed in...
We present theoretical surface brightness fluctuation (SBF) amplitudes for single-burst stellar populations of young and intermediate age (25 Myr ≤ t 5 Gyr) metallicities Z = 0.0003, 0.001, 0.004, 0.008, 0.01, 0.02, 0.04. The magnitudes colors as expected in the Johnson-Cousins (UBVRIJHK) photometric system are provided. pay attention to contribution thermally pulsating asymptotic giant branch (TP-AGB) stars. sensitivity predicted SBF changes mass-loss scenario along TP-AGB phase is...
We measure surface brightness fluctuation (SBF) magnitudes in the F814W filter and g-I colors for nine bright early-type Fornax cluster galaxies imaged with Hubble Space Telescope Advanced Camera Surveys (ACS). The goal is to achieve first systematic SBF calibration ACS/F814W bandpass. Because of its much higher throughput, more efficient studies distant than ACS/F850LP bandpass that has been used study nearby systems. Over color range spanned by sample galaxies, 1.06<g-I<1.32 (AB mag),...