A. Traficante
A5049559831- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Atmospheric Ozone and Climate
- Molecular Spectroscopy and Structure
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Spectroscopy and Laser Applications
- Astrophysical Phenomena and Observations
- Advanced Combustion Engine Technologies
- Superconducting and THz Device Technology
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Scientific Research and Discoveries
- Adaptive optics and wavefront sensing
- Atmospheric chemistry and aerosols
- Infrared Target Detection Methodologies
- Optical Polarization and Ellipsometry
- Vehicle emissions and performance
- Atomic and Molecular Physics
- Aquatic Ecosystems and Phytoplankton Dynamics
- Advanced Chemical Physics Studies
- Space Exploration and Technology
- Phase Equilibria and Thermodynamics
Institute for Space Astrophysics and Planetology
2017-2024
National Institute for Astrophysics
2017-2024
University of Manchester
2012-2019
Max Planck Institute for Radio Astronomy
2015
Cardiff University
2015
University of Rome Tor Vergata
2010-2014
California Institute of Technology
2014
Trinity House
2014
Thermal images of cold dust in the Central Molecular Zone Milky Way, obtained with far-infrared cameras on board Herschel satellite, reveal a ∼3 × 107 M☉ ring dense and clouds orbiting Galactic center. Using simple toy model, an elliptical shape having semi-major axes 100 60 pc is deduced. The major axis this inclined by about 40° respect to plane sky oriented perpendicular Bar. appears trace system stable x2 orbits predicted for barred potential. Sgr A⋆ displaced geometrical center symmetry...
(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...
New observations with <i>Herschel<i/> allow accurate measurement of the equilibrium temperature large dust grains heated by interstellar radiation field (ISRF), which is critical in deriving column density and masses. We present maps derived from SPIRE PACS data two fields along Galactic plane, obtained as part Hi-GAL survey during science demonstration phase (SDP). analyze distribution spatially, well lines-of-sight (LOS) through Galaxy. The zero-level offsets were established comparison...
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 present the data reduction pipeline for Hi-GAL survey. is a key project of Herschel satellite which mapping inner part Galactic plane (|l| <= 70\cdot and |b| 1\cdot), using 2 PACS 3 SPIRE frequency bands, from 70{\mu}m to 500{\mu}m. Our relies only partially on Interactive Standard Environment (HIPE) features several newly developed routines perform reduction, including accurate culling, noise estimation minimum variance map-making, latter performed with ROMAGAL algorithm, deep...
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 present the $360^\circ$ catalogue of physical properties Hi-GAL compact sources, detected between 70 and 500 $\mu$m. This release not only completes analogous previously produced by collaboration for $-71^\circ \lesssim \ell 67^\circ$, but also meaningfully improves it thanks to a new set heliocentric distances, 120808 in total. About third 150223 entries are located newly added portion Galactic plane. A first classification based on detection at $\mu$m as signature ongoing star-forming...
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 High-mass stars have an enormous influence on the evolution of interstellar medium in galaxies, so it is important that we understand how they form. We examine central clumps within a sample seven infrared-dark clouds (IRDCs) with range masses and morphologies. use 1-pc-scale observations from Northern Extended Millimeter Array (NOEMA) IRAM 30m telescope to trace dense cores 2.8-mm continuum, gas kinematics C18O, HCO+, HNC, N2H+ (J = 1–0). supplement our continuum six IRDCs observed...
We tested the validity of three Larson relations in a sample 213 massive clumps selected from Herschel Hi-GAL survey and combined with data MALT90 3mm emission lines. The have been divided 5 evolutionary stages to discuss also as function evolution. show that this ensemble does not follow relations, regardless clump phase. A consequence breakdown is virial parameter $\alpha_{vir}$ dependence mass (and radius) only gravitational energy, independent kinetic energy system, good descriptor...
The early evolution of massive cluster progenitors is poorly understood. We investigate the fragmentation properties from 0.3 pc to 0.06 scales a homogenous sample infrared-quiet clumps within 4.5 kpc selected ATLASGAL survey. Using ALMA 7m array we detect compact dust continuum emission towards all targets, and find that fragmentation, at these scales, limited. mass distribution fragments uncovers large fraction cores above 40 $M_\odot$, corresponding dense (MDCs) with masses up ~400...
The recent data collected by {\it Herschel} have confirmed that interstellar structures with filamentary shape are ubiquitously present in the Milky Way. Filaments thought to be formed several physical mechanisms acting from large Galactic scales down sub-pc fractions of molecular clouds, and they might represent a possible link between star formation large-scale structure Galaxy. In order study this potential link, statistically significant sample filaments spread throughout Galaxy is...
ABSTRACT The formation of stellar clusters dictates the pace at which galaxies evolve, and solving question their will undoubtedly lead to a better understanding Universe as whole. While it is well known that star form within parsec-scale overdensities interstellar molecular gas called clumps, is, however, unclear whether these clumps represent high-density tip continuous gaseous flow gradually leads towards stars, or transition physical properties. Here, we present unique analysis sample 27...
Infrared dark clouds (IRDCs) are cold and dense reservoirs of gas potentially available to form stars. Many these likely be pristine structures representing the initial conditions for star formation. The study presented here aims construct analyze accurate column density dust temperature maps IRDCs by using first <i>Herschel<i/> data from Hi-GAL galactic plane survey. These fundamental quantities, essential understanding processes such as fragmentation in early stages formation stars...
<i>Context. <i/> Variations in the dust emissivity are critical for gas mass determinations derived from far-infrared observations, but also separating foreground emission Cosmic Microwave Background (CMB). Hi-GAL observations allow us first time to study variations inner regions of Galactic plane at resolution below 1°.<i>Aims. <i/>We present maps spectral index combined <i>Herschel<i/> PACS 160 <i>μ<i/>m, SPIRE 250 350 and 500 <i>μ<i/>m data, IRIS 100 we analyze spatial as a function...
Aims: To explore the infrared and radio properties of one closest Galactic starburst regions. Methods: Images obtained with Herschel Space Observatory at wavelengths 70, 160, 250, 350, 500 microns using PACS SPIRE arrays are analyzed compared continuum VLA data 8 micron images from Spitzer Telescope. The morphology far-infrared emission is combined radial velocity measurements millimeter centimeter wavelength transitions to identify features likely be associated W43 complex. Results:...
It has been shown that by means of different physical mechanisms the expansion HII regions can trigger formation new stars all masses. This process may be important to massive but never quantified in Galaxy. We use Herschel-PACS and -SPIRE images from Herschel Infrared survey Galactic plane, Hi-GAL, perform this study. combine Spitzer-GLIMPSE -MIPSGAL, radio-continuum sub-millimeter surveys such as ATLASGAL with Hi-GAL study Young Stellar Objects (YSOs) observed towards regions. select a...
We present a catalogue of starless and protostellar clumps associated with infrared dark clouds (IRDCs) in 40° wide region the inner Galactic plane (|b| ≤ 1°). have extracted far-infrared (FIR) counterparts 3493 IRDCs known distance longitude range 15° l 55° searched for young using Herschel survey, survey carried out satellite. Each clump is identified as compact source detected at 160, 250 350 μm. The been classified or starless, based on their emission (or lack emission) 70 identify 1723...
We present early results from the JCMT Plane Survey (JPS), which has surveyed northern inner Galactic plane between longitudes l=7 and l=63 degrees in 850-{\mu}m continuum with SCUBA-2, as part of James Clerk Maxwell Telescope Legacy programme. Data l=30 degree survey region, contains massive star-forming regions W43 G29.96, are analysed after approximately 40% observations had been completed. The pixel-to-pixel noise is found to be 19 mJy/beam, a smooth over beam area, projected equivalent...
We present the first data release of James Clerk Maxwell Telescope Plane Survey (JPS), JPS Public Release 1. is an 850-μm continuum survey six fields in northern inner Galactic plane a longitude range ℓ = 7°–63°, made with Submillimetre Common-User Bolometer Array 2. This consists emission maps regions average pixel-to-pixel noise 7.19 mJy beam−1, when smoothed over beam, and compact source catalogue containing 7813 sources. The 95 per cent completeness limits are estimated at 0.04 Jy beam−1...
(Abridged) The initial physical conditions of high-mass stars and protoclusters remain poorly characterized. To this end we present the first targeted ALMA 1.3mm continuum spectral line survey towards starless clump candidates, selecting a sample 12 most massive candidates ($400-4000\, M_\odot$) within 5 kpc. joint 12+7m array maps have high spatial resolution $\sim 3000\, \mathrm{au}$ ($\sim 0.8^{\prime\prime}$) point source mass-completeness down to 0.3\, M_\odot$ at $6\sigma$ (or...
ABSTRACT We use the 13CO (2–1) emission from SEDIGISM (Structure, Excitation, and Dynamics of Inner Galactic InterStellar Medium) high-resolution spectral-line survey inner Galaxy, to extract molecular cloud population with a large dynamic range in spatial scales, using Spectral Clustering for Interstellar Molecular Emission Segmentation (scimes) algorithm. This work compiles catalogue total 10 663 clouds, 300 which we were able assign distances compute physical properties. study some global...
Abstract The internal structure of the prestellar core G208.68-19.02-N2 (G208-N2) in Orion Molecular Cloud 3 (OMC-3) region has been studied with Atacama Large Millimeter/submillimeter Array. dust continuum emission revealed a filamentary length ∼5000 au and an average H 2 volume density ∼6 × 10 7 cm −3 . At tip this structure, there is compact object, which we call nucleus , radius ∼150–200 mass ∼0.1 M ⊙ central ∼2 9 radial profile r −1.87±0.11 scaling ∼3.7 times higher than that singular...
<ns4:p>As we learn more about the multi-scale interstellar medium (ISM) of our Galaxy, develop a greater understanding for complex relationships between large-scale diffuse gas and dust in Giant Molecular Clouds (GMCs), how it moves, is affected by nearby massive stars, which portions those GMCs eventually collapse into star forming regions. The interactions gas, stellar populations form what has come to be known as ecology Galaxy. Because are deeply embedded plane takes up significant...
We present a first study of the star-forming compact dust condensations revealed by <i>Herschel<i/> in two 2° × Galactic Plane fields centered at [, <i>b<i/>] = [30°, 0°] and =[59°, , respectively, observed during science demonstration phase for Infrared GALactic plane survey (Hi-GAL) key-project. Compact source catalogs extracted five Hi-GAL bands (70, 160, 250, 350 500 <i>μ<i/>m) were merged based on simple criteria positional association spectral energy distribution (SED) consistency into...