A5041690921- Astrophysics and Star Formation Studies
- Molecular Spectroscopy and Structure
- Atmospheric Ozone and Climate
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Spectroscopy and Laser Applications
- Advanced Chemical Physics Studies
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Space Exploration and Technology
- Astrophysical Phenomena and Observations
- Galaxies: Formation, Evolution, Phenomena
- Phase Equilibria and Thermodynamics
- Gamma-ray bursts and supernovae
National Institute for Astrophysics
2021-2024
Institute for Space Astrophysics and Planetology
2021-2023
Arcetri Astrophysical Observatory
2019-2021
University of Florence
2018-2021
Abstract We present a new derivation of the Milky Way’s current star formation rate (SFR) based on data Herschel InfraRed Galactic Plane Survey (Hi-GAL). estimate distribution SFR across plane from star-forming clumps identified in Hi-GAL survey and calculate total sum their contributions. The global amounts to 2.0 ± 0.7 M ⊙ yr −1 , which 1.7 0.6 coming with reliable heliocentric distance assignment. This value is general agreement estimates found literature last decades. profile density...
ABSTRACT Most stars, including the Sun, are born in rich stellar clusters containing massive stars. Therefore, study of chemical reservoir star-forming regions is crucial to understand basic ingredients available at dawn planetary systems. We present a detailed molecular inventory hot core G31.41+0.31 from project GUAPOS (G31.41+0.31 Unbiased ALMA sPectral Observational Survey). analyse 34 species for first time plus 20 analysed previous works, oxygen, nitrogen, sulfur, phosphorus, and...
We have studied four complex organic molecules (COMs), the oxygen-bearing methyl formate (CH 3 OCHO) and dimethyl ether OCH ) as well nitrogen-bearing formamide (NH 2 CHO) ethyl cyanide (C H 5 CN), towards a large sample of 39 high-mass star-forming regions representing different evolutionary stages, from early to evolved phases. aim identify potential correlations chemical links between trace their sequence through star formation process. analysed spectra obtained at 3, 2, 0.9 mm with...
Peptide-like bond molecules, which can take part to the formation of proteins in a primitive Earth environment, have been detected up now only towards few sources. We present study HNCO, HC(O)NH$_{2}$, CH$_{3}$NCO, CH$_{3}$C(O)NH$_{2}$, CH$_{3}$NHCHO, CH$_{3}$CH$_{2}$NCO, NH$_{2}$C(O)NH$_{2}$, NH$_{2}$C(O)CN, and HOCH$_{2}$C(O)NH$_{2}$ hot core G31.41+0.31. used spectrum obtained from ALMA 3mm spectral survey GUAPOS, with an angular resolution 1.2"$\times$1.2" ($\sim$4500 au), derive column...
The physical mechanisms behind the fragmentation of high-mass dense clumps into compact star-forming cores and properties these are fundamental topics that heavily investigated in current astrophysical research. ALMAGAL survey provides opportunity to study this process at an unprecedented level detail statistical significance, featuring high-angular resolution $1.38$ mm ALMA observations $1013$ massive various Galactic locations. These cover a wide range distances (∼2-8,kpc), masses M_ ⊙ ),...
Stars form preferentially in clusters embedded inside massive molecular clouds, many of which contain high-mass stars. Thus, a comprehensive understanding star formation requires robust and statistically well-constrained characterization the early evolution these clusters. To achieve this, we designed ALMAGAL Large Program that observed 1017 star-forming regions distributed throughout Galaxy, sampling different evolutionary stages environmental conditions. In this work, present acquisition...
A large fraction of stars form in clusters containing high-mass stars, which subsequently influences the local and galaxy-wide environment. Fundamental questions about physics responsible for fragmenting molecular parsec-scale clumps into cores a few thousand astronomical units (au) are still open, that only statistically significant investigation with ALMA is able to address; instance: identification dominant agents determine core demographics, mass, spatial distribution as function...
We present multi-transition observations of PN towards a sample nine massive dense cores in different evolutionary stages. Using transitions with excitation conditions, we have found for the first time that temperatures are range 5-30 K. To investigate main chemical route formation (surface-chemistry vs. gas-phase chemistry), and dominant desorption mechanism (thermal shock), compared our results those obtained from molecules tracing physical conditions (SiO, SO, CH3OH, N2H+). line profiles...
ABSTRACT Phosphorus nitride (PN) is the P-bearing species with highest number of detections in star-forming regions. Multiline studies molecule have shown that excitation temperature PN usually lower than gas kinetic temperature, suggesting likely conditions sub-thermal excitation. We present an analysis takes possible into account a sample 24 massive observed (2–1), (3–2), (4–3), and (6–5) IRAM-30m APEX telescopes detected lines 15 them. Together 9 similar sources previous works, we...
Context. One of the goals astrochemistry is to understand degree chemical complexity that can be reached in star-forming regions, along with identification precursors building blocks life interstellar medium. To answer such questions, unbiased spectral surveys large bandwidth and high resolution are needed, particular, resolve line blending chemically rich sources identify each molecule (especially for complex organic molecules). These kinds observations have already been successfully...
We use data from the ALMA Evolutionary Study of High Mass Protocluster Formation in Galaxy (ALMAGAL) survey to study 100 ALMAGAL regions at $\sim$ 1 arsecond resolution located between 2 and 6 kpc distance. Using 1.3mm line continuum we estimate flow rates onto individual cores. focus specifically on along filamentary structures associated with these Our primary analysis is centered around position velocity cuts H$_2$CO (3$_{0,3}$ - 2$_{0,2}$) which allow us measure fields, surrounding...
Context. Observations of the different isomers molecules in interstellar medium (ISM) have revealed that both low- and high-energy can be present space despite low temperature conditions. It has been shown presence these may due to tunneling effects. Aims. We carried out a theoretical study cis–trans isomerization reactions two astrophysically relevant acids, formic acid (HCOOH) thioformic (HC(O)SH), where latter recently discovered space. also searched for towards hot core G31.41+0.31...
Context. The G31.41+0.31 Unbiased ALMA sPectral Observational Survey (GUAPOS) project targets the hot molecular core (HMC) (G31) to reveal complex chemistry of one most chemically rich high-mass star-forming regions outside Galactic center (GC). Aims. In third paper we present a study nine O-bearing (CH 3 OH, 13 CH 18 OH , CHO, OCH COCH C 2 H 5 aGg′-(CH OH) and gGg′-(CH ) six N-bearing CN, CN) organic molecules toward G31. aim this work is characterize abundances in G31 compare them with...
We present a study of the three-dimensional (3D) distribution interstellar dust derived from stellar extinction observations toward Taurus molecular cloud (MC) and its relation with neutral atomic hydrogen (H I ) emission at 21 cm wavelength carbon monoxide 12 CO 13 in J = 1 → 0 transition. used histogram oriented gradients (HOG) method to match morphology 3D reconstruction density (3D dust) gas tracers’ emission. The result HOG analysis is map relationship between distances radial...
Context. Investigating the flow of material along filamentary structures towards central core can help provide insights into high-mass star formation and evolution. Aims. Our main motivation is to answer question what properties accretion flows are in star-forming clusters. We used data from ALMA Evolutionary Study High Mass Protocluster Formation Galaxy (ALMAGAL) survey study 100 ALMAGAL regions at a ∼1″ resolution, located between ∼2 6 kpc. Methods. Making use ∼1.3 mm line continuum data,...
We present a comparison of the Milky Way’s star formation rate (SFR) surface density (∑ SFR ) obtained with two independent state-of-the-art observational methods. The first method infers Σ from observations dust thermal emission interstellar grains in far-infrared wavelengths registered Herschel infrared Galactic Plane Survey (Hi-GAL). second determines by modeling current population O-, B-, and A-type stars 6 kpc × area around Sun. find an agreement between methods within factor for mean...
Context. The astrochemistry of the important biogenic element phosphorus (P) is still poorly understood, but observational evidence indicates that P-bearing molecules are likely associated with shocks. Aims. We study and some shock tracers towards one chemically richest hot molecular cores, G31.41+0.31, in framework project “G31.41+0.31 Unbiased ALMA sPectral Observational Survey” (GUAPOS), which being carried out Atacama Large Millimeter Array (ALMA). Methods. observed PN, PO, SO, SO 2 ,...
The TOPG\"ot project studies a sample of 86 high-mass star-forming regions in different evolutionary stages from starless cores to ultra compact HII regions. aim the survey is analyze molecular species statistically significant study chemical evolution regions, and identify tracers phases. sources have been observed with IRAM 30m telescope spectral windows at 1, 2, 3 mm. In this first paper, we present energy distributions (SEDs) derive physical parameters. We use MADCUBA software emission...
Most stars, including the Sun, are born in rich stellar clusters containing massive stars. Therefore, study of chemical reservoir star-forming regions is crucial to understand basic ingredients available at dawn planetary systems. We present a detailed molecular inventory hot core G31.41+0.31 from project GUAPOS (G31.41+0.31 Unbiased ALMA sPectral Observational Survey). analyze 34 species for first time plus 20 analyzed previous works, oxygen, nitrogen, sulfur, phosphorus, and chlorine...
We present a study of the three-dimensional (3D) distribution interstellar dust derived from stellar extinction observations toward Taurus molecular cloud (MC) and its relation with neutral atomic hydrogen (HI) emission at 21 cm wavelength carbon monoxide $^{12}$CO $^{13}$CO in $J=1\rightarrow0$ transition. used histogram oriented gradients (HOG) method to match morphology 3D reconstruction density (3D dust) gas tracers' emission. The result HOG analysis is map relationship between distances...
The G31.41+0.31 Unbiased ALMA sPectral Observational Survey (GUAPOS) project targets the hot molecular core (HMC) (G31), to unveil complex chemistry of one most chemically rich high-mass star-forming regions outside Galactic Center (GC). In third paper project, we present a study nine O-bearing (CH$_3$OH, $^{13}$CH$_3$OH, CH$_3^{18}$OH, CH$_3$CHO, CH$_3$OCH$_3$, CH$_3$COCH$_3$ , C$_2$H$_5$OH, aGg'-(CH$_2$OH)$_2$, and gGg'-(CH$_2$OH)$_2$) six N-bearing (CH$_3$CN, $^{13}$CH$_3$CN,...
We present a comparison of the Milky Way's star formation rate (SFR) surface density ($\Sigma_{\rm SFR}$) obtained with two independent state-of-the-art observational methods. The first method infers $\Sigma_{\rm SFR}$ from observations dust thermal emission interstellar grains in far-infrared wavelengths registered Herschel infrared Galactic Plane Survey (Hi-GAL). second determines by modeling current population O-, B-, and A-type stars 6 kpc $\times$ area around Sun. find an agreement...
The astrochemistry of the important biogenic element phosphorus (P) is still poorly understood, but observational evidence indicates that P-bearing molecules are likely associated with shocks. We study molecules, as well some shock tracers, towards one chemically richest hot molecular core, G31.41+0.31, in framework project "G31.41+0.31 Unbiased ALMA sPectral Observational Survey" (GUAPOS), observed Atacama Large Millimeter Array (ALMA). have PN, PO, SO, SO2, SiO, and SiS, through their...