M. T. Beltrán
A5058154645- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Molecular Spectroscopy and Structure
- Astro and Planetary Science
- Atmospheric Ozone and Climate
- Medieval and Early Modern Iberia
- Astronomy and Astrophysical Research
- Historical Studies of Medieval Iberia
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Historical Studies on Spain
- Gamma-ray bursts and supernovae
- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- Advanced Chemical Physics Studies
- Astrophysics and Cosmic Phenomena
- Superconducting and THz Device Technology
- Spectroscopy and Laser Applications
- Dark Matter and Cosmic Phenomena
- Calibration and Measurement Techniques
- Atomic and Molecular Physics
- Archaeological and Historical Studies
- Medieval Architecture and Archaeology
- Geomagnetism and Paleomagnetism Studies
- Historical Art and Architecture Studies
Arcetri Astrophysical Observatory
2015-2024
National Institute for Astrophysics
2009-2020
Universitat Politècnica de Catalunya
2019
Universidad de Málaga
1980-2015
Gobierno de Navarra
2015
Weatherford College
2015
University of Chicago
2008-2010
Universitat de Barcelona
1998-2009
Universidad Autónoma de Madrid
2004-2007
University of Sussex
2004-2005
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...
We summarize the utility of precise cosmic microwave background (CMB) polarization measurements as probes physics inflation. focus on prospects for using CMB to differentiate various inflationary mechanisms. In particular, a detection primordial B‐mode would demonstrate that inflation occurred at very high energy scale, and inflaton traversed super‐Planckian distance in field space. explain how such or constraint illuminate aspects Planck scale. Moreover, can constrain scale‐dependence...
(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...
Assuming that dark matter is a weakly interacting massive particle (WIMP) species X produced in the early Universe as cold thermal relic, we study collider signal of pp or $ p\bar{p} \rightarrow \bar{X}X + jets and its distinguishability from standard-model background processes associated with missing energy. We assume WIMP sole related to within reach LHC — "maverick" it couples quarks through higher dimensional contact interaction. simulate final-state X\bar{X} dominant (SM) find...
Massive stars play a crucial role in the production of heavy elements and evolution interstellar medium, yet how they form is still matter debate. We report high-angular-resolution submillimeter observations toward massive hot molecular core (HMC) high-mass star-forming region G31.41+0.31. find that gravitational collapse HMC controlled by magnetic field. The simultaneously contracting rotating, field lines threading are deformed along its major axis, acquiring an hourglass shape. energy...
Despite compelling arguments that significant discoveries of physics beyond the standard model are likely to be made at Large Hadron Collider, it remains possible this machine will make no such discoveries, or directly relevant dark matter problem. In article, we study ability astrophysical experiments deduce nature in a scenario. most studies, relic abundance and detection prospects evaluated within context some specific particle models (e.g., supersymmetry). Here, assuming single weakly...
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)...
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. The origin and life-cycle of molecular clouds are still poorly constrained, despite their importance for understanding the evolution interstellar medium. Many large-scale surveys Galactic plane have been conducted recently, allowing rapid progress in this field. Nevertheless, a sub-arcminute resolution global view distribution gas, from diffuse medium to dense clumps, relationshipto spiral structure, is missing.
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...
Abstract A complete understanding of the initial conditions high-mass star formation and what processes determine multiplicity requires study magnetic field in young massive cores. Using Atacama Large Millimeter/submillimeter Array (ALMA) 250 GHz polarization observations (0 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mover accent="true"> <mml:mrow> <mml:mi>.</mml:mi> </mml:mrow> <mml:mi>″</mml:mi> </mml:mover> </mml:math> 3 = 1000 au) ALMA 220...
We present 6 cm VLA observations of nine regions with molecular or HH outflows that appear to be driven by young stellar objects low bolometric luminosity. Radio continuum emission at 3.6 had been detected previously toward the center symmetry 13 in these regions. With new we have able estimate spectral index wavelength range for 11 outflow central (Class 0 and Class I) sources. All indices obtained sources are positive consistent partially thick thermal free-free emission. discuss this...
The axion is one of the best motivated candidates for particle dark matter. We study and update constraints imposed by recent CMB LSS experiments on mass axions produced misalignment mechanism, as a function both inflationary scale reheating temperature. Under some particular although not unconventional assumptions, induces isocurvature perturbations with an amplitude too large to be compatible observations. Specifically, inflation taking place at intermediate energy scales, we derive...
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...
Abstract Phosphorus (P) is one of the essential elements for life due to its central role in biochemical processes. Recent searches have shown that P-bearing molecules (in particular PN and PO) are present star-forming regions, although their formation routes remain poorly understood. In this letter, we report observations PO towards seven molecular clouds located Galactic Center, which characterized by different types chemistry. detected five out sources, whose chemistry thought be...
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...