A5088400527- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Adaptive optics and wavefront sensing
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Advanced optical system design
- Spectroscopy and Laser Applications
- Optical Systems and Laser Technology
- Astro and Planetary Science
- Astronomical and nuclear sciences
- Radio Astronomy Observations and Technology
- Calibration and Measurement Techniques
- Scientific Research and Discoveries
- Optical Wireless Communication Technologies
- History and Developments in Astronomy
- Remote Sensing in Agriculture
- History of Science and Medicine
- Plant Water Relations and Carbon Dynamics
- Geophysics and Gravity Measurements
- Advanced Fluorescence Microscopy Techniques
- Impact of Light on Environment and Health
Osservatorio Astronomico di Padova
2016-2025
National Institute for Astrophysics
2007-2024
National Institute of Optics
2017
Royal Observatory of Belgium
2010-2013
University of Padua
2004-2007
University of Central Lancashire
2004
Observatoire Midi-Pyrénées
2004
University of Canterbury
2004
Abstract GAs Stripping Phenomena in galaxies with MUSE (GASP) is a new integral-field spectroscopic survey at the VLT aimed studying gas removal processes galaxies. We present an overview of and show first example galaxy undergoing strong stripping. GASP obtaining deep data for 114 z = 0.04–0.07 stellar masses range <?CDATA ${10}^{9.2}\mbox{--}{10}^{11.5}\,{M}_{\odot }$?> different environments (galaxy clusters groups over more than four orders magnitude halo mass). targets optical...
The new VISual and Infrared Telescope for Astronomy (VISTA) has started operations. Over its first five years it will be collecting data six public surveys, one of these is the near-infrared YJKsVISTA survey Magellanic Clouds system (VMC). This comprises LMC, SMC, Bridge connecting two galaxies fields in Stream. paper provides an overview VMC strategy presents science results. main goals are determination spatially resolved SFH 3D structure system. Therefore, designed to reach stars as faint...
Galaxies that are being stripped of their gas can sometimes be recognized from optical appearance. Extreme examples galaxies the so-called ``jellyfish galaxies'', exhibit tentacles debris material with a characteristic jellyfish morphology. We have conducted first systematic search for at low-z (z=0.04-0.07) in different environments, selecting varying degrees morphological evidence stripping. visually inspected B and V-band images identified 344 candidates 71 galaxy clusters...
It is well known that galaxies falling into clusters can experience gas stripping due to ram-pressure by the intra-cluster medium (ICM). The most spectacular examples are with extended tails of optically-bright stripped material as "jellyfish". We use first large homogeneous compilation jellyfish in from WINGS and OmegaWINGS surveys, follow-up MUSE observations GASP programme investigate orbital histories reconstruct their history through position vs. velocity phase- space diagrams....
We search for massive and compact galaxies (superdense galaxies, hereafter SDGs) at z = 0.03–0.11 in the Padova-Millennium Galaxy Group Catalogue, a spectroscopically complete sample representative of general field population local universe. find that with radii mass densities comparable to high-z passive represent 4.4% all stellar masses above 3 × 1010 M☉, yielding number density 4.3 10−4 h3 Mpc−3. Most them are S0s (70%) or ellipticals (23%), red, have intermediate-to-old populations,...
Intermediate resolution spectra at the Ca ii triplet have been obtained for 55 candidate red giants in field of globular cluster M22 with VLT/FORS2 instrument. Spectra were also a number standard clusters to provide calibration observed line strengths overall abundance [Fe/H]. For 41 member stars that lie within V − VHB bounds calibration, we find an distribution is substantially broader than expected from errors alone. We argue this broad cannot be result differential reddening. Instead,...
Based on MUSE data from the GASP survey, we study Halpha-emitting extraplanar tails of 16 cluster galaxies at z~0.05 undergoing ram pressure stripping. We demonstrate that dominating ionization mechanism this gas (between 64% and 94% Halpha emission in depending diagnostic diagram used) is photoionization by young massive stars due to ongoing star formation (SF) taking place stripped tails. This SF occurs dynamically quite cold HII clumps with a median velocity dispersion sigma = 27 km s^-1....
ABSTRACT The star formation quenching depends on environment, but a full understanding of what mechanisms drive it is still missing. Exploiting sample galaxies with masses , drawn from the WIde-field Nearby Galaxy-cluster Survey (WINGS) and its recent extension OMEGAWINGS, we investigate rate (SFR) as function stellar mass ( M ) in galaxy clusters at . We use non-member 0.02 < z 0.09 field control sample. Overall, find agreement between SFR– relation two environments, detect population...
Abstract Within the GASP survey, aimed at studying effect of ram pressure stripping on star formation quenching in cluster galaxies, we analyze here ALMA observations jellyfish galaxy JW100. We find an unexpected large amount molecular gas (∼2.5 × 10 <?CDATA ${M}_{\odot }$?> ), 30% which is located stripped tail out to ∼35 kpc from center. The overall kinematics similar one shown by ionized gas, but for clear signatures double components along direction detected only 2 disk. line ratio r 21...
Ram-pressure stripping by the intracluster medium (ICM) is one of most advocated mechanisms that affect properties cluster galaxies. A recent study based on a small sample has found many galaxies showing strong signatures ram-pressure also possess an active galactic nucleus (AGN), suggesting possible correlation between two phenomena. This result not been confirmed subsequent study. Building upon previous findings, here we combine MUSE observations conducted within GASP program and general...
Well determined radial velocities and abundances are essential for analyzing the properties of Globular Cluster system Milky Way. However more than 50% these clusters have no spectroscopic measure their metallicity. In this context, work provides new twenty Way globular which lack or poorly known values quantities. The derived from spectra obtained at Ca II triplet using FORS2 imager spectrograph VLT, calibrated with red giants in a number well abundances. For about half our sample we...
This paper presents a spatially-resolved kinematic study of the jellyfish galaxy JO201, one most spectacular cases ram-pressure stripping (RPS) in GASP (GAs Stripping Phenomena Galaxies with MUSE) survey. By studying environment we find that it is moving through dense intra-cluster medium Abell 85 at supersonic speeds along our line sight, and likely accompanied by small group galaxies. Given density galaxy's mass, projected position velocity within cluster, estimate JO201 must so far have...
We derive the star formation history (SFH) for several regions of Large Magellanic Cloud (LMC), using deep near-infrared data from VISTA YJKs survey system (VMC). The include three almost-complete 1.4 deg2 tiles located ~3.5° away LMC centre in distinct directions. They are split into 21.0′ × 21.5′ (0.12 deg2) subregions, and each these is analysed independently. To this dataset, we add two 11.3′ (0.036 subregions selected based on their small uniform extinction inside 30 Doradus tile. SFH...
The evolution and lifetimes of thermally pulsating asymptotic giant branch (TP-AGB) stars suffer from significant uncertainties. In this work, we analyze the numbers luminosity functions TP-AGB in six quiescent, low metallicity ([Fe/H] ≲ −0.86) galaxies taken ACS Nearby Galaxy Survey Treasury sample, using Hubble Space Telescope (HST) photometry both optical near-infrared filters. contain over 1000 (at least 60 per field). We compare observed relative red (RGB) stars, NTP-AGB/NRGB, to models...
The so-called jellyfish galaxies are objects exhibiting disturbed morphology, mostly in the form of tails gas stripped from main body galaxy. Several works have strongly suggested ram pressure stripping to be mechanism driving this phenomenon. Here, we focus on one these objects, drawn a sample optically selected galaxies, and use it validate SINOPSIS, spectral fitting code that will used for analysis GASP (GAs Stripping Phenomena with MUSE) survey, study spatial distribution physical...
[Abridged] To effectively investigate galaxy formation and evolution, it is of paramount importance to exploit homogeneous data for large samples galaxies in different environments. The WINGS (WIde-field Nearby Galaxy-cluster Survey) project aim evaluate physical properties a complete sample low redshift clusters be used as reference evolutionary studies. survey still ongoing the original dataset will soon enlarged with new observations. This paper presents entire collection measurements...
Jellyfish galaxies in clusters are key tools to understand environmental processes at work dense environments. The advent of Integral Field Spectroscopy has recently allowed study a significant sample stripped the cluster environment z$\sim 0.05$, through GAs Stripping Phenomena with MUSE (GASP) survey. However, optical spectroscopy can only trace ionized gas component H$_{\alpha}$ emission that be spatially resolved on kpc scale this redshift. complex interplay between various phases...
(ABRIDGED) Globular clusters trace the formation and evolution of Milky Way surrounding galaxies, outline their chemical enrichment history. To accomplish these tasks it is important to have large samples with homogeneous data analysis derive kinematics, abundances, ages locations. We obtain metallicities alpha-element enhancement for over 800 red giant stars in 51 Galactic bulge, disc, halo globular that are among most distant and/or highly reddened Galaxy's cluster system. observed R ~...
Abstract With MUSE, Chandra , VLA, ALMA, and UVIT data from the GASP program, we study multiphase baryonic components in a jellyfish galaxy (JW100) with stellar mass 3.2 × 10 11 M ⊙ hosting an active galactic nucleus (AGN). We present its spectacular extraplanar tails of ionized molecular gas, UV light, X-ray radio continuum emission. This represents excellent laboratory to interplay between different gas phases star formation influence stripping, heating, AGNs. analyze physical origin...
Using MUSE observations from the GASP survey, we study 54 galaxies undergoing ram-pressure stripping (RPS) spanning a wide range in galaxy mass and host cluster mass. We use this rich sample to how star formation rate (SFR) tails of stripped gas depends on properties its cluster. show that interplay between all parameters involved is complex there not single, dominant one shaping observed amount SFR. Hence, develop simple analytical approach describe fraction SFR tail, as function velocity...
We present VLA HI observations of JO206, a prototypical ram-pressure stripped galaxy in the GASP sample. This massive (M$_{\ast} =$ 8.5 $\times$ 10$^{10}$ M$_{\odot}$) is located at redshift $z 0.0513, near centre low-mass cluster, IIZw108 ($σ\sim575$ km/s). JO206 characterised by long tail ($\geq$90 kpc) ionised gas away ram-pressure. find similarly same direction as and measure total mass $3.2 \times 10^{9}$ M$_{\odot}$. about half expected given stellar surface density JO206. A $1.8...
Abstract In the disks of four jellyfish galaxies from GASP sample at redshift ∼0.05 we detect molecular gas masses systematically higher than in field galaxies. These are being stripped their by ram pressure intracluster medium and are, general, forming stars a high rate with respect to nonstripped similar stellar masses. We find that, unless giant clouds disk unbound leading exceptionally CO–to–H 2 conversion factors, these have content 4–5 times normal masses, depletion ranging ∼1 9 Gyr,...
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...