A5001454910- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- Astronomy and Astrophysical Research
- Dark Matter and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Adaptive optics and wavefront sensing
- Gamma-ray bursts and supernovae
- Relativity and Gravitational Theory
- Particle Accelerators and Free-Electron Lasers
- Advanced Combustion Engine Technologies
- Particle physics theoretical and experimental studies
- Astrophysics and Star Formation Studies
- Scientific Research and Discoveries
Osservatorio Astronomico di Padova
2024
Scuola Internazionale Superiore di Studi Avanzati
2021-2024
Institute for Fundamental Physics of the Universe
2021-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
2022-2024
University of Padua
2024
We take advantage of the NIRCam photometric observations available as part Cosmic Evolution Early Release Science survey (CEERS) to identify and analyse very red sources in an effort discover dusty star forming galaxies. select galaxies objects with a S/N>3 at 4.4 $\mu$m S/N<2 all JWST HST filters $\lambda\leq2\mu$m, which corresponds [F200W]-[F444W]>1.2 considering CEERS depths. This selection is ideal (Av>1 mag) stellar masses between $10^6$ $10^{10}\, \rm M_{\odot}$ z<5, more massive...
We present the Cosmic Evolution Early Release Science (CEERS) Survey, a 77.2 hour Director's Discretionary Program. CEERS demonstrates, tests, and validates efficient extragalactic surveys using coordinated, overlapping parallel observations with JWST instrument suite, including NIRCam MIRI imaging, NIRSpec low (R~100) medium (R~1000) resolution spectroscopy, slitless grism (R~1500) spectroscopy. targets Hubble Space Telescope-observed region of Extended Groth Strip (EGS) field, supported by...
Abstract We explore the possibility that dark matter (DM) component in galaxies may originate fractional gravity. In such a framework, standard law of inertia continues to hold, but gravitational potential associated with given DM density distribution is determined by modified Poisson equation including derivatives (i.e., noninteger type) are meant describe nonlocal effects. analytically derive expression gravity corresponds various spherically symmetric profiles, Navarro–Frenk–White (NFW)...
Abstract We look for possible evidence of a nonminimal coupling (NMC) between dark matter (DM) and gravity using data from the X-COP compilation galaxy clusters. consider theoretically motivated NMC that may dynamically arise collective behavior coarse-grained DM field (e.g., via Bose–Einstein condensation) with averaging/coherence length L . In Newtonian limit, modifies Poisson equation by term <?CDATA ${L}_{\mathrm{NMC}}^{2}{{\rm{\nabla }}}^{2}\rho $?> <mml:math...
We aim to constrain the stellar initial mass function (IMF) during epoch of reionization. To this purpose, we build up a semi-empirical model for reionization history Universe based on various ingredients: latest determination UV galaxy luminosity from JWST out redshift z≲12; data-inferred and simulation-driven assumptions redshift-dependent escape fraction ionizing photons primordial galaxies; simple yet flexible parameterization IMF ϕ(m⋆)∼m⋆ξe−m⋆,c/m⋆ in terms high-mass end slope ξ<0...
Abstract In the past, high- z active galactic nuclei (AGNs) were given a minor role as possible drivers of reionization, despite initial evidence in favor their large space densities at low luminosities by Chandra and Hubble Space Telescope. Recent observations from JWST are finding relatively numbers faint AGNs > 4, convincingly confirming these early results. We present sample ∼ 5 AGNs, both wide, shallow ground-based surveys deep, pencil-beam JWST, allowing us to estimate with...
Recently, in Benetti et al. (Astrophys. J. 2023, 949, 65), we suggested that the dark matter (DM) component galaxies may originate fractional gravity. In such a framework, DM exists, but gravitational potential associated to its density distribution is determined by modified Poisson equation including derivatives (i.e., of noninteger type), which are meant describe nonlocal effects; as such, this scenario different from theories where baryonic emulates DM-like effects via modifications...
Abstract We look for empirical evidence of a nonminimal coupling (NMC) between dark matter (DM) and gravity in the dynamics local spiral galaxies. In particular, we consider theoretically motivated NMC that may arise dynamically from collective behavior coarse-grained DM field (e.g., via Bose–Einstein condensation) with averaging/coherence length L . Newtonian limit, this amounts to modify Poisson equation by term 2 ∇ ρ proportional Laplacian density itself. show such term, when acting as...
We exploit the recent determination of cosmic star formation rate (SFR) density at high redshifts z≳4 to derive astroparticle constraints on three common dark matter (DM) scenarios alternative standard cold (CDM): warm (WDM), fuzzy (ψDM) and self-interacting (SIDM). Our analysis relies ultraviolet (UV) luminosity functions measured from blank field surveys by Hubble Space Telescope out z≲10 down UV magnitudes MUV≲−17. extrapolate these fainter yet unexplored magnitude ranges perform...
Abstract In a series of recent papers we put forward ‘fractional gravity’ framework striking an intermediate course between modified gravity theory and exotic dark matter (DM) scenario, which envisages the DM component in virialized halos to feel non-local interaction mediated by gravity. The remarkable success this model reproducing several aspects phenomenology motivates us look for general relativistic extension. Specifically, propose theory, dubbed Relativistic Scalar Fractional Gravity...
Abstract We investigate self-gravitating equilibria of halos constituted by dark matter (DM) non-minimally coupled to gravity. In particular, we consider a theoretically motivated non-minimal coupling that may arise when the averaging/coherence length L associated with fluid description DM collective behavior is comparable local curvature scale. Newtonian limit, such amounts modification Poisson equation term 2 ∇ ρ proportional Laplacian density itself. further adopt general power-law state...
Recently, we put forward a framework where the dark matter (DM) component within virialized halos is subject to non-local interaction originated by fractional gravity (FG) effects. In previous works, demonstrated that such can substantially alleviate small-scale issues of standard ΛCDM paradigm, without altering DM mass profile predicted N-body simulations, and retaining its successes on large cosmological scales. this paper, investigate further, probe FG via high-quality data individual...
Abstract We report Atacama Large Millimeter/submillimeter Array (ALMA) high-resolution (≲0.3″) observations of water emission lines p -H 2 O(2 02 − 1 11 ), o O(3 21 3 12 O(4 22 4 13 in the strongly lensed galaxy HATLASJ113526.2-01460 at redshift z ∼3.1. From lensing-reconstructed maps and line profiles, we infer general physical properties interstellar medium (ISM) molecular clouds where arise. find that vapor o- H ) are mainly excited by far-infrared (FIR) pumping from dust radiation a warm...
Gravitational lensing, a compelling physical phenomenon, offers unique avenue to investigate the morphology and properties of distant faint celestial objects. This paper seeks provide comprehensive overview current state observations concerning strongly lensed Dusty Star-Forming Galaxies. Emphasis is placed on pivotal role played by cutting-edge facilities like James Webb Space Telescope Square Kilometer Array Observatory. These advanced instruments, operating at disparate ends...
Gravitational lensing, a compelling physical phenomenon, offers unique avenue to investigate the morphology and properties of distant faint celestial objects. This paper seeks provide comprehensive overview current state observations concerning strongly lensed Dusty Star-Forming Galaxies. Emphasis is placed on pivotal role played by cutting-edge facilities like James Webb Space Telescope Square Kilometer Array Observatory. These advanced instruments operating at two opposite ends...
Near- to mid-Infrared observations (from Spitzer and JWST) have revealed a hidden population of galaxies at redshift z=3-6, called optically-dark objects, which are believed be massive dusty star-formers. While sources widely recognized as significant component the stellar mass function, history their assembly remains unexplored. However, they thought progenitors more early-type found in present-day groups clusters. It is thus important examine possible connection between dark merging...
In the past, high-z AGNs were given a minor role as possible drivers of reionization, despite initial evidences in favor their large space densities at low luminosities by Chandra and HST. Recent observations from JWST are finding relatively numbers faint z>4, convincingly confirming these early results. We present sample z~5 (both wide, shallow ground-based surveys deep, pencil-beam JWST), allowing to estimate with unprecedented accuracy. The bright end (M1450<-26) AGN luminosity function...
During the last decade, studies about highly attenuated and massive red star-forming galaxies (RedSFGs) at $z \sim 4$ have suggested that they could constitute a crucial population for unraveling mechanisms driving transition from vigorous star formation to quiescence high redshifts. Since such seems be linked morphological transformation, studying properties of these RedSFGs is essential our understanding galaxy evolution. To this end, we are using JWST/NIRCam images CEERS survey assemble...
[abridged] We explore the possibility that dark matter (DM) component in galaxies may originate fractional gravity. In such a framework, standard law of inertia continues to hold, but gravitational potential associated given DM density distribution is determined by modified Poisson equation including derivatives (i.e., non-integer type), are meant describe non-local effects. derive analytically expression gravity corresponds various spherically symmetric profiles, Navarro-Frenk-White (NFW)...
We look for possible evidence of a non-minimal coupling (NMC) between dark matter (DM) and gravity using data from the X-COP compilation galaxy clusters. consider theoretically motivated NMC that may dynamically arise collective behavior coarse-grained DM field (e.g., via Bose-Einstein condensation) with averaging/coherence length $Ł_{\mathrm{nmc}}$. In Newtonian limit, modifies Poisson equation by term $Ł_{\mathrm{nmc}}^2 \nabla^2 ρ$ proportional to Laplacian density itself. show this when...
[abridged] Recently, in Benetti et al. (Astrophys. J. 2023, 949, 65), we suggested that the dark matter (DM) component galaxies may originate fractional gravity. In such a framework, DM exists, but gravitational potential associated to its density distribution is determined by modified Poisson equation including derivatives, which are meant describe nonlocal effects. al., showed gravity worked very well for reproducing kinematics of disk-dominated galaxies, especially dwarfs; there also...
We exploit the recent determination of cosmic star formation rate (SFR) density at redshifts $z\gtrsim 4$ to derive astroparticle constraints on three common dark matter scenarios alternative standard cold (CDM): warm (WDM), fuzzy ($\psi$DM) and self-interacting (SIDM). Our analysis relies UV luminosity functions measured by Hubble Space Telescope out $z\lesssim 10$ down magnitudes $M_{\rm UV}\lesssim -17$. extrapolate these fainter yet unexplored magnitude ranges, perform abundance matching...