A5057381505- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Cosmology and Gravitation Theories
- Adaptive optics and wavefront sensing
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Radio Astronomy Observations and Technology
- Astrophysics and Star Formation Studies
- Advanced Measurement and Metrology Techniques
Osservatorio Astronomico di Padova
2021-2023
University of Padua
2022-2023
Astronomical Observatory of Capodimonte
2023
The majority of massive disk galaxies in the local Universe show a stellar barred structure their central regions, including our Milky Way1,2. Bars are supposed to develop dynamically cold disks at low redshift, as strong gas turbulence typical high redshift suppresses or delays bar formation3,4. Moreover, simulations predict bars be almost absent beyond z = 1.5 progenitors Way-like galaxies5,6. Here we report observations ceers-2112, spiral galaxy zphot ≈ 3, which was already mature when...
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...
Context: This paper focuses on a class of galaxies characterised by an extremely low surface brightness: the ultra-diffuse (UDGs). We used new integral-field spectroscopic data from ESO Large Programme Looking into faintEst WIth MUSE (LEWIS) project. Aims: Our main goals are addressing formation channels and investigating possible correlations their observational properties. In particular, we derive stellar kinematics dynamical Methods: extract 1D stacked spectrum inside effective radius to...
UDG 32 is an ultra-diffuse galaxy (UDG) candidate in the Hydra I cluster that was discovered extended network of stellar filaments jellyfish NGC 3314A. This affected by ram pressure stripping and it hypothesised may have formed from its stripped material. In this paper, we address whether can be associated with material 3314A constrain formation scenario relation to environment. We use new integral-field spectroscopic data MUSE large programme `LEWIS' conjunction deep multi-band photometry...
UDG 32 is an ultra-diffuse galaxy (UDG) candidate in the Hydra I cluster that was discovered extended network of stellar filaments jellyfish NGC 3314A. This affected by ram pressure stripping and it hypothesised may have formed from this stripped material. The aim paper to address whether can be associated with material 3314A constrain its formation scenario relation environment. We use new integral-field spectroscopic data MUSE large programme `LEWIS' conjunction deep multi-band photometry...
More than 10% of the barred galaxies with a direct measurement bar pattern speed host an ultrafast bar. These bars extend beyond corotation radius and challenge our understanding orbital structure galaxies. Most them are found in spiral galaxies, rather lenticular ones. We analysed properties detected CALIFA Survey to investigate whether they artefact resulting from overestimation and/or underestimation or new class bars, whose has not yet been understood. revised available measurements...
We investigate the link between bar rotation rate and dark matter content in barred galaxies by concentrating on cases of lenticular NGC4264 NGC4277. These two gas-poor have similar morphologies, sizes, luminosities. But, hosts a fast bar, which extends to nearly corotation, while embedded NGC4277 is slow falls short corotation. derive fraction $f_{\rm DM, bar}$ within region from Jeans axisymmetric dynamical models matching stellar kinematics obtained with MUSE integral-field spectrograph...
ABSTRACT Although ultra diffuse galaxies (UDGs) are found in large numbers clusters of galaxies, the role cluster environment shaping their low surface brightness and sizes is still uncertain. Here, we examine a sample UDGs Hydra I (D = 51 Mpc) with new radial velocities obtained as part LEWIS (Looking into faintest MUSE) project using VLT/MUSE data. Using phase-space, or infall diagnostic, diagram compare to other known clusters. The UDGs, along bulk regular have relative located near core,...
Looking into the faintEst WIth MUSE (LEWIS) is an ESO large observing programme that aims at obtaining first homogeneous integral-field spectroscopic survey of 30 extremely low-surface-brightness (LSB) galaxies in Hydra I cluster with ESO-VLT. The majority LSB sample (22 total) are ultra-diffuse (UDGs). Data acquisition started December 2021 and expected to be concluded by March 2024. Up June 2023, 29 targets were observed redshift has been derived for 20 them. distribution systemic...
Aims: We characterised the properties of bar hosted in lenticular galaxy NGC 4277, which is located behind Virgo cluster. Methods: measured length and strength from surface photometry obtained broad-band imaging Sloan Digital Sky Survey we derived pattern speed stellar kinematics integral-field spectroscopy performed with Multi Unit Spectroscopic Explorer at Very Large Telescope. also estimated co-rotation radius circular velocity, constrained by correcting streaming motions for asymmetric...
We present surface photometry and stellar kinematics of IC 3167, a dwarf galaxy hosting lopsided weak bar infalling into the Virgo cluster. measured radius strength from broad-band imaging pattern speed by applying Tremaine-Weinberg method to stellar-absorption integral-field spectroscopy. derived ratio corotation (R = 1.7 + 0.5 - 0.3) speed. The probability that is rotating slowly more than twice as likely fast. This allows us infer formation this was triggered ongoing interaction rather...
Looking into the faintEst WIth MUSE (LEWIS) is an ESO large observing programme aimed at obtaining first homogeneous integral-field spectroscopic survey of 30 extremely low-surface brightness (LSB) galaxies in Hydra I cluster galaxies, with ESO-VLT. The majority LSB sample (22 total) are ultra-diffuse (UDGs). distribution systemic velocities Vsys ranges between 2317 km/s and 5198 centred on mean velocity (Vsys = 3683 $\pm$ 46 km/s). Considering dispersion cluster, 17 out 20 targets confirmed...
ABSTRACT Dwarf barred galaxies are the perfect candidates for hosting slowly rotating bars. They common in dense environments and have a relatively shallow potential well, making them prone to heating by interactions. When an interaction induces bar formation, should rotate slowly. reside massive centrally concentrated dark matter haloes, which slow down rotation through dynamical friction. While predictions suggest that bars be common, measurements of pattern speed, using Tremaine–Weinberg...
Although ultra diffuse galaxies (UDGs) are found in large numbers clusters of galaxies, the role cluster environment shaping their low surface brightness and sizes is still uncertain. Here we examine a sample UDGs Hydra I (D = 51 Mpc) with new radial velocities obtained as part LEWIS (Looking into faintest MUSE) project using VLT/MUSE data. Using phase-space, or infall diagnostic, diagram compare to other known clusters. The UDGs, along bulk regular have relative located near core, thus...
Dwarf barred galaxies are the perfect candidates for hosting slowly-rotating bars. They common in dense environments and they have a relatively shallow potential well, making them prone to heating by interactions. When an interaction induces bar formation, should rotate slowly. reside massive centrally-concentrated dark matter halos, which slow down rotation through dynamical friction. While predictions suggest that bars be common, measurements of pattern speed, using Tremaine-Weinberg...