R. Cesaroni
A5068449126- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Molecular Spectroscopy and Structure
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Atmospheric Ozone and Climate
- Gamma-ray bursts and supernovae
- Galaxies: Formation, Evolution, Phenomena
- Spectroscopy and Laser Applications
- Astrophysics and Cosmic Phenomena
- Advanced Chemical Physics Studies
- Atomic and Molecular Physics
- Calibration and Measurement Techniques
- Radio Astronomy Observations and Technology
- Scientific Research and Discoveries
- High-pressure geophysics and materials
- Superconducting and THz Device Technology
- Phase Equilibria and Thermodynamics
- Cold Atom Physics and Bose-Einstein Condensates
- Spacecraft and Cryogenic Technologies
- Advanced Combustion Engine Technologies
- Ionosphere and magnetosphere dynamics
- History and Developments in Astronomy
Arcetri Astrophysical Observatory
2015-2024
National Institute for Astrophysics
2003-2016
Union astronomique internationale
2002
Universidad de Guanajuato
2002
Center for Astrophysics Harvard & Smithsonian
2002
<i>Context. <i/>Thanks to its excellent 5100 m high site in Chajnantor, the Atacama Pathfinder Experiment (APEX) systematically explores southern sky at submillimeter wavelengths, both continuum and spectral line emission. Studying emission from interstellar dust is essential locating highest density regions medium, deriving their masses, column densities, structures, large-scale morphologies. In particular, early stages of (massive) star formation remain poorly understood, mainly because...
We present the first results from science demonstration phase for Hi-GAL survey, <i>Herschel<i/> key program that will map inner Galactic plane of Milky Way in 5 bands. outline our data reduction strategy and some highlights on two observed 2° × tiles approximately centered at <i>l<i/> = 30° 59°. The regions are extremely rich intense highly structured extended emission which shows a widespread organization filaments. Source SEDs can be built hundreds objects fields, physical parameters...
Hi-GAL, the Herschel infrared Galactic Plane Survey, is an Open Time Key Project of Space Observatory. It will make unbiased photometric survey inner plane by mapping a 2° wide strip in longitude range ∣l∣ < 60° five wavebands between 70 μm and 500 μm. The aim Hi-GAL to detect earliest phases formation molecular clouds high-mass stars use optimum combination wavelength coverage, sensitivity, strategy, speed deliver homogeneous census star-forming regions cold structures interstellar medium....
(Abridged) We present the first public release of high-quality data products (DR1) from Hi-GAL, {\em Herschel} infrared Galactic Plane Survey. Hi-GAL is keystone a suite continuum surveys near-IR to radio, and covers five wavebands at 70, 160, 250, 350 500 micron, encompassing peak spectral energy distribution cold dust for 8 < T 50K. This inner Milky Way in longitude range 68{\deg} > l -70{\deg} |b|<1{\deg} latitude strip. Photometric maps have been produced with ROMAGAL pipeline, that...
We present a study of molecular outflows toward sample 69 luminous IRAS point sources. The is associated with dense gas and has far-infrared luminosities ranging from 102 to 105 L☉, indicating these objects as regions likely forming high-mass stars. Mapping in the CO J = 2-1 line shows that are ubiquitous regions. Most have masses tens M☉. typical dynamical timescale flow, without correcting for inclination flow axis, few times 104 yr. energy 1046 ergs, comparable turbulent core. Nearly half...
Context. The mechanism of formation massive stars is still a matter debate. It not yet clear if it can be considered to scaled-up analogue the low-mass star regime, or there are additional agents like merging lower-mass forming objects accretion from initially unbound material. Most uncertainties come lack diagnostic tools evolutionarily classify large samples candidate protostellar that then studied in more detail.
Hi-GAL is a large-scale survey of the Galactic plane, performed with Herschel in five infrared continuum bands between 70 and 500 $\mu$m. We present band-merged catalogue spatially matched sources their properties derived from fits to spectral energy distributions (SEDs) heliocentric distances, based on photometric catalogs presented Molinari et al. (2016a), covering portion plane $-71.0^{\circ}< \ell < 67.0^{\circ}$. The contains 100922 regular SED, 24584 which show $\mu$m counterpart are...
We study the molecular abundance and spatial distribution of simplest sugar alcohol, ethylene glycol (EG), glycoladehyde (GA), other chemically related complex organic species towards massive star-forming region G31.41+0.31. have analyzed multiple single dish interferometric data, obtained excitation temperatures column densities using an LTE analysis. reported for first time presence EG G31.41+0.31, we also detected transitions molecules such as GA, methyl formate (MF), dimethyl ether (DME)...
In order to study the fragmentation of massive dense cores, which constitute cluster cradles, we observed with PdBI in most extended configuration continuum at 1.3 mm and CO(2-1) emission four cores. We detect dust condensations down ~0.3 Msun separate millimeter sources 0.4" or ~1000 AU, comparable sensitivities separations reached optical/infrared studies clusters. The high angular resolution images reveal high-velocity knots usually aligned previously known outflow directions. This,...
We report on ALMA observations of continuum and molecular line emission with 0.4" resolution towards the high-mass star forming region G35.20-0.74 N. Two dense cores are detected in typical hot-core tracers, such as CH3CN, which reveal velocity gradients. In one these cores, field can be fitted an almost edge-on Keplerian disk rotating about a central mass 18 Msun. This finding is consistent results recent study CO first overtone bandhead at 2.3mum The radius >2500 au 3 To reconcile...
Context. Circumstellar discs around massive stars could mediate the accretion onto star from infalling envelope, and minimize effects of radiation pressure. Despite such a crucial role, only few convincing candidates have been provided for deeply embedded O-type (proto)stars.
Phosphorus is a crucial element in biochemistry, especially the P-O bond, which key for formation of backbone deoxyribonucleic acid. So far, PO has only been detected towards envelope evolved stars, and never star-forming regions. We report first detections two massive regions, W51 e1/e2 W3(OH), using data from IRAM 30m telescope. PN also The abundance ratio PO/PN 1.8 3 respectively. Our chemical model indicates that molecules are chemically related formed via gas-phase ion-molecule...
Context. High-mass stars form in clusters, but neither the early fragmentation processes nor detailed physical leading to most massive are well understood. Aims. We aim understand fragmentation, as disk formation, outflow generation, and chemical during high-mass star formation on spatial scales of individual cores. Methods. Using IRAM Northern Extended Millimeter Array (NOEMA) combination with 30 m telescope, we have observed large program CORE 1.37 mm continuum spectral line emission at...
To understand how Phosphorus-bearing molecules are formed in star-forming regions, we have analysed ALMA observations of PN and PO towards the massive region AFGL 5142, combined with a new analysis data comet 67P/Churyumov-Gerasimenko taken ROSINA instrument onboard Rosetta. The maps show that emission arises from several spots associated low-velocity gas narrow linewidths cavity walls bipolar outflow. is more abundant than most spots, PO/PN ratio increasing as function distance to...
ABSTRACT The SEDIGISM (Structure, Excitation and Dynamics of the Inner Galactic Interstellar Medium) survey used APEX telescope to map 84 deg2 plane between ℓ = −60° +31° in several molecular transitions, including 13CO (2 – 1) C18O 1), thus probing moderately dense (∼103 cm−3) component interstellar medium. With an angular resolution 30 arcsec a typical 1σ sensitivity 0.8–1.0 K at 0.25 km s−1 velocity resolution, it gives access wide range structures, from individual star-forming clumps...
We report on interferometric observations at 3.2 and 1.3 mm of the massive young stellar object IRAS 20126+4104 obtained in C34S CH3OH lines continuum emission. The data confirm existence a Keplerian disk, as already suggested by various authors. However, mass central is ~7 , significantly less than previous estimates. believe that such discrepancy due to fact rotation curve affected not only star but also innermost regions disk itself: this leads an overestimate when low-density tracers are...
A survey for molecular outflows was carried out by mapping the CO J = 2-1 line toward a sample of 69 luminous IRAS point sources. Sixty objects have luminosities from 103 to 105 L☉ and are associated with dense gas traced NH3, identifying them as high-mass star-forming regions. Among sources, 65 sources data that suitable outflow identification. Thirty-nine regions show spatially confined high-velocity wing emission in CO, indicative outflows. Most without identifiable lie within 0° < l 50°...
<i>Aims. <i/>We have searched for star formation activity (mainly infall and outflow signatures) in a sample of high-mass molecular clumps (<i>M<i/> <i>><i/> 100 ) different evolutionary stages with wide range surface densities, the aim looking trends testing observationally recent theoretical models which predict need minimum density to form stars.<i>Methods. <i/>Our has been selected from single-dish 1.2 mm continuum surveys is composed 48 massive clumps, 29 are IR-loud 19 IR-dark. Each...
The present study aims at characterizing the massive star forming region G35.20N, which is found associated with least one outflow and contains multiple dense cores, of them recently a Keplerian rotating disk. We used ALMA to observe G35.20N in continuum line emission 350 GHz. observed frequency range covers tracers gas (e.g. H13CO+, C17O), molecular outflows SiO), hot cores CH3CN, CH3OH). 870 um map reveals an elongated dust structure (0.15 pc long 0.013 wide) perpendicular large-scale...
Aims. Recently, substantial flaring in the 6.7 GHz methanol maser line has been observed toward high-mass young stellar object (YSO) S255 NIRS 3, where an accretion burst was also detected IR. Our goal is to study change properties of masers between pre- and outburst phases, investigate connection burst.
Context. In high-mass (≥7 M⊙) star formation (SF) studies, high-angular resolution is crucial for resolving individual protostellar outflows (and possibly accretion disks) from the complex contribution of nearby (high- and low-mass) young stellar objects (YSO). Previous interferometric studies have focused mainly on single objects.
The high-mass star forming sites SgrB2(M) and SgrB2(N) have been the target of numerous studies, revealing e.g. a rich chemistry. We want to characterize their physical chemical structure using ALMA high-angular resolution observations at mm wavelengths, reaching spatial scales about 4000 au, covering whole band 6 (from 211 275 GHz). In order determine continuum emission in line-rich sources, we use new statistical method: STATCONT. detect 27 sources 20 SgrB2(N). study across 6, compare it...