A5080819635- Galaxies: Formation, Evolution, Phenomena
- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Astro and Planetary Science
- Black Holes and Theoretical Physics
- Relativity and Gravitational Theory
- Planetary Science and Exploration
- History and Developments in Astronomy
- Phase Equilibria and Thermodynamics
- Heat Transfer Mechanisms
- Geophysics and Sensor Technology
- Superconducting and THz Device Technology
- Magnetic and Electromagnetic Effects
- Historical and Architectural Studies
- Mechanics and Biomechanics Studies
- Solar and Space Plasma Dynamics
- Multidisciplinary Science and Engineering Research
- Particle Accelerators and Free-Electron Lasers
National Institute for Astrophysics
2011-2024
Astronomical Observatory of Rome
2015-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2020-2024
Sapienza University of Rome
2022-2024
University of Florence
2009-2011
Arcetri Astrophysical Observatory
2011
Trieste Astronomical Observatory
2009
ABSTRACT We use the Cosmic Archaeology Tool (CAT) semi-analytical model to explore contribution of Population (Pop) III/II stars and active galactic nuclei (AGNs) galaxy ultraviolet (UV) luminosity function (LF) evolution at 4 ≤ z 20. compare in particular with recent JWST data order apparent tension between observations theoretical models number density bright galaxies ≳ 10. The predicts a star formation history dominated by UV faint (MUV > −18) galaxies, Pop III $\lesssim 10~{{\ \rm...
With the aim of investigating whether stellar sources can account for ≥108 M⊙ dust masses inferred from mm/sub-mm observations samples 5 < z 6.4 quasars, we develop a chemical evolution model which follows metals and on characteristic lifetimes, taking into destruction mechanisms. Using grid yields as function initial mass metallicity over range 1–40 0–1 Z⊙, show that role asymptotic giant branch (AGB) stars in cosmic at high redshift might have been overlooked. In particular, find (i)...
We present a semi-analytical model for the formation and evolution of high redshift quasar (QSO). reconstruct set hierarchical merger histories 10^13 Msun dark matter halo corresponding galaxy its central super massive black hole. The code GAMETE/QSODUST consistently follows: hole assembly via both coalescence with other holes gas accretion; build up star history host galaxy, driven by binary mergers mass gas, stars, metals in interstellar medium (ISM), accounting exchanges external (infall...
We interpret recent ALMA observations of z > 6 normal star forming galaxies by means a semi-numerical method, which couples the output cosmological hydrodynamical simulation with chemical evolution model accounts for contribution to dust enrichment from supernovae, asymptotic giant branch stars and grain growth in interstellar medium. find that while stellar sources dominate mass small galaxies, higher level metal experienced Mstar 10^9 Msun allows efficient growth, provides dominant...
We explore the minimal conditions which enable formation of metal-enriched solar and subsolar-mass stars. Using a one-zone semi-analytical model, we accurately follow chemical thermal evolution gas with aim understanding how initial metal dust content alters cooling fragmentation properties, hence characteristic stellar mass. find that in absence grains, occurs at densities nH∼ [104–105] cm−3 when metallicity exceeds Z∼ 10−4 Z⊙. The resulting masses are ≥10 M⊙. inclusion Fe Si does not...
The assembly of the first super massive black holes (SMBHs) at $z \gtrsim 6$ is still a subject intense debate. If (BHs) grow their Eddington rate, they must start from $\gtrsim 10^4 \, M_\odot$ seeds formed by direct collapse gas. Here we explore alternative scenario where $\sim 100 BH remnants stars super-Eddington rate via radiatively inefficient slim accretion disks. We use an improved version cosmological, data-constrained semi-analytic model GAMETE/QSOdust, follow evolution nuclear BHs...
The growth of the first super massive black holes (SMBHs) at z > 6 is still a major challenge for theoretical models. If it starts from hole (BH) remnants Population III stars (light seeds with mass ~ 100 Msun) requires super-Eddington accretion. An alternative route to start heavy formed by direct collapse gas onto 10^5 Msun BH. Here we investigate relative role light and as BH progenitors SMBHs. We use cosmological, data constrained semi-analytic model GAMETE/QSOdust simulate several...
We calculate the dust formed around asymptotic giant branch (AGB) and super-AGB stars of metallicity Z = 0.008 by following evolution models with masses in range 1 M⊙ ≤ M 8 through thermal pulses phase, assuming that forms via condensation molecules within a wind expanding isotropically from stellar surface. find that, because strong hot bottom burning (HBB) experienced, high-mass produce silicates, whereas lower mass objects are predicted to be surrounded carbonaceous grains; transition...
We study the impact of star-forming mini-haloes, and Initial Mass Function (IMF) Population III (Pop III) stars, on Galactic halo Metallicity Distribution (MDF) properties C-enhanced C-normal stars at [Fe/H]<-3. For our investigation we use a data-constrained merger tree model for Milky Way formation, which has been improved to self-consistently describe physical processes regulating star-formation in including poor sampling Pop IMF. find that only when mini-haloes are included low-Fe tail...
ABSTRACT Understanding the formation and growth of supermassive black holes (SMBHs) at high redshift represents a major challenge for theoretical models. In this work, we investigate early evolution first SMBHs by constraining their distribution in mass luminosity z &gt; 4. particular, focus on poorly explored low-mass end nuclear hole (BH) down to ≃ 4, explore its connection with nature BH seeds processes governing growth. To aim, have developed CAT (Cosmic Archaeology Tool), new...
Abstract Supermassive black holes (SMBHs) are thought to originate from early universe seed of mass M BH ∼ 10 2 –10 5 ⊙ and grown through cosmic time. Such seeds could be powering the active galactic nuclei (AGN) found in today’s dwarf galaxies. However, probing a connection between local SMBHs has not yet been observationally possible. Massive hosted galaxies at intermediate redshifts, on other hand, may represent evolved counterparts formed very times. We present sample seven broad-line...
ABSTRACT JWST is unveiling for the first time accreting black holes (BHs) with masses of 106 − 107 M⊙ at z &gt; 4, most distant residing in GNz11 = 10.6. Are we really surprised to find them nuclei ≃ 5 11 galaxies? Here predict properties 4 &lt; BHs and their host galaxies considering an Eddington-limited (EL) a super-Eddington (SE) BH accretion scenario, using Cosmic Archaeology Tool (CAT) semi-analytical model. We calculate transmitted spectral energy distribution CAT synthetic...
ABSTRACT We investigate the detectability of single-event coalescing black hole binaries with total mass $100\!-\!600{\, {\rm {M}}_{\odot }}$ at cosmological distances (5 ≲ z 20) next generation terrestrial gravitational wave observatories, specifically Einstein Telescope and Cosmic Explorer. Our ability to observe these is limited by low-frequency performance detectors. Higher order multipoles signal are observable in systems, detection such serves both extend range over which improve...
Our aim is to show how different hypotheses about Type Ia supernova progenitors can affect Galactic chemical evolution. We include SN progenitor models, identified by their distribution of time delays, in a very detailed evolution model for the Milky Way which follows several species. test single degenerate and double models progenitors, as well other more empirical based on differences delay distributions. find that assuming or scenario produces negligible predicted [O/Fe] vs. [Fe/H]...
We investigate the metallicity distribution function (MDF) in Galactic halo and relative fraction of carbon-normal carbon-rich stars. To this aim, we use an improved version semi-analytical code GAlaxy MErger Tree Evolution (gamete), that reconstructs hierarchical merger tree Milky Way (MW), following star formation history metal dust evolution individual progenitors. The predicted scaling relations between dust, gas masses for MW progenitors show a good agreement with observational data...
We compare theoretical dust yields for stars with masses 1 ≤ mstar 8 M⊙ and metallicities 0.001 Z 0.008 observed production rates (DPRs) using carbon-rich oxygen-rich asymptotic giant branch (C-AGB O-AGB) in the Large Small Magellanic Clouds (LMC SMC). The measured DPR of C-AGB LMC are reproduced only if mass loss from AGB is very efficient during carbon-star stage. same overpredict SMC, suggesting a stronger metallicity dependence mass-loss DPRs O-AGB suggest that rapid silicate enrichment...
The dust formation process in the winds of Asymptotic Giant Branch stars is discussed, based on full evolutionary models with mass range $1$M$_{\odot} \leq$M$\leq 8$M$_{\odot}$, and metallicities $0.001 < Z <0.008$. Dust grains are assumed to form an isotropically expanding wind, by growth pre--existing seed nuclei. Convection, for what concerns treatment convective borders efficiency schematization adopted, turns out be physical ingredient used calculate sequences highest impact results...
We investigate the evolutionary properties of a sample quasars (QSOs) at 5 < z 6.4 using semi-analytical hierarchical model GAMETE/QSOdust. find that observed these QSOs are well reproduced by common formation scenario in which stars form according to standard initial mass function, via quiescent star and efficient merger-driven bursts, while central black hole (BH) grows gas accretion BH–BH mergers. Eventually, strong active galactic nuclei-driven wind starts clear up interstellar medium...
Context. Studying the coupling between energy output produced by central quasar and host galaxy is fundamental to fully understand evolution. Quasar feedback indeed supposed dramatically affect properties depositing large amounts of momentum into interstellar medium (ISM).
Observations of hyper-luminous quasars at $z>6$ reveal the rapid growth supermassive black holes (SMBHs $>10^9 \rm M_{\odot}$) whose origin is still difficult to explain. Their progenitors may have formed as remnants massive, metal free stars (light seeds), via stellar collisions (medium-weight seeds) and/or massive gas clouds direct collapse (heavy seeds). In this work we investigate for first time relative role these three seed populations in formation SMBHs within an Eddington-limited...
Abstract The science objectives of the LISA mission have been defined under implicit assumption a 4-years continuous data stream. Based on performance Pathfinder, it is now expected that will duty cycle $$\approx 0.75$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mo>≈</mml:mo> <mml:mn>0.75</mml:mn> </mml:mrow> </mml:math> , which would reduce effective span usable to 3 years. This paper reports results study by Science Group, was charged with assessing...
The next generation of ground-based gravitational-wave detectors will observe coalescences black holes and neutron stars throughout the cosmos, thousands them with exceptional fidelity. Science Book is result a 3-year effort to study science capabilities networks detectors. Such would make it possible address unsolved problems in numerous areas physics astronomy, from Cosmology Beyond Standard Model particle physics, how they could provide insights into workings strongly gravitating systems,...
In this paper we provide predictions for the BH population that would be observable with planned JWST surveys at $5 \le z 15$. We base our study on recently developed Cosmic Archaeology Tool (CAT), which allows us to model seeds formation and growth, while being consistent general of AGNs galaxies observed $4 7$. find will a complementary view active BHs $z > 5$, JADES-Medium/-Deep capable detecting numerous populate faint-end distribution, COSMOS-Web sampling large enough area detect rarest...
The existence of luminous quasars (QSOs) at the epoch reionization (EoR; i.e., z > 6) powered by well-grown supermassive black holes (SMBHs) with masses ≳10 9 M ⊙ challenges models early SMBH formation and growth. To shed light on nature these sources, we started a multiwavelength program based sample 18 HYPerluminous Epoch ReionizatION (HYPERION). These are QSOs whose SMBHs must have had most rapid mass growth during first gigayear Universe therefore acquired largest their respective...