A5073078938- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Dark Matter and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Advanced Chemical Physics Studies
- Solar and Space Plasma Dynamics
- Spectroscopy and Quantum Chemical Studies
- Archaeological and Historical Studies
- Astrophysics and Star Formation Studies
- Spectroscopy and Laser Applications
- Adaptive optics and wavefront sensing
- Medieval Architecture and Archaeology
- Quantum, superfluid, helium dynamics
- Quantum Mechanics and Non-Hermitian Physics
- Archaeological and Geological Studies
- Radiation Detection and Scintillator Technologies
- Pulsars and Gravitational Waves Research
- Atmospheric Ozone and Climate
- Astro and Planetary Science
- Particle physics theoretical and experimental studies
- 3D Surveying and Cultural Heritage
- Scientific Research and Discoveries
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
2006-2025
Universidad de Granada
2024
Instituto de Ciencias Astronómicas, de la Tierra y del Espacio
2018-2020
Gemini South Observatory
2018-2020
Centro Científico Tecnológico - San Juan
2018-2020
Consejo Nacional de Investigaciones Científicas y Técnicas
2020
Universidad Autónoma de Bucaramanga
2018
Swinburne University of Technology
2011-2015
University of Miami
2014
National University of San Juan
2008-2011
We present results over an 11-year Solar cycle of cosmic antiprotons based on <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mn>1.1</a:mn><a:mo>×</a:mo><a:msup><a:mn>10</a:mn><a:mn>6</a:mn></a:msup></a:math> events in the rigidity range from 1.00 to 41.9 GV. The <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mover accent="true"><c:mi>p</c:mi><c:mo stretchy="false">¯</c:mo></c:mover></c:math> fluxes exhibit distinct properties. magnitude...
We present the precision measurement of 2824 daily helium fluxes in cosmic rays from May 20, 2011 to October 29, 2019 rigidity interval 1.71 100 GV based on 7.6×10^{8} nuclei collected with Alpha Magnetic Spectrometer (AMS) aboard International Space Station. The flux and proton ratio exhibit variations multiple timescales. In nearly all time intervals 2014 2018, we observed recurrent a period 27 days. Shorter periods 9 days 13.5 are 2016. strength three periodicities changes rigidity....
We present the precision measurements of 11 years daily cosmic electron fluxes in rigidity interval from 1.00 to 41.9 GV based on 2.0×10^{8} electrons collected with Alpha Magnetic Spectrometer (AMS) aboard International Space Station. The exhibit variations multiple timescales. Recurrent flux periods 27 days, 13.5 and 9 days are observed. find that show distinctly different time proton fluxes. Remarkably, a hysteresis between is observed significance greater than 6σ at rigidities below 8.5...
We report the properties of precision time structures cosmic nuclei He, Li, Be, B, C, N, and O fluxes over an 11-year solar cycle from May 2011 to November 2022 in rigidity range 1.92 60.3 GV. The show similar but not identical variations with amplitudes decreasing increasing rigidity. In particular, below 3.64 GV B fluxes, 2.15 are significantly less affected by modulation than He flux. observe that these differences linearly correlated spectral indices fluxes. This shows, a...
We propose a method for measuring the projected rotational velocity $v sin i$ with high-precision even in spectra blended lines. Though not automatic, our is designed to be applied systematically large numbers of objects without excessive computational requirement. calculate cross correlation function (CCF) object spectrum against zero-rotation template and use Fourier transform (FT) CCF central maximum measure parameter taking limb darkening effect its wavelength dependence into account....
We present the first results of our pilot study 8 photometrically selected Lyman continuum (LyC) emitting galaxy candidates from COSMOS field and focus on their optical emission line ratios. Observations were performed in H K bands using Multi-Object Spectrometer for Infra-Red Exploration (MOSFIRE) instrument at Keck Observatory, targeting [OII], H$\beta$, [OIII] lines. find that LyC have high ionization parameters, based [OIII]/[OII] ratios (O32), with an average ratio sample 2.5$\pm$0.2....
Lyman break galaxies (LBGs) at z ~ 3-4 are targeted to measure the fraction of continuum (LyC) flux that escapes from high redshift galaxies. However, LBGs identified using technique which preferentially selects with little or no LyC. We re-examine standard LBG selection criteria by performing spectrophotometry on composite spectra constructed 794 U_nGR-selected 3 literature while adding LyC varying strengths. The modified accurately predict range redshifts, properties, and in have...
The PAU (Physics of the Accelerating Universe) Survey goal is to obtain photometric redshifts (photo-z) and Spectral Energy Distribution (SED) astronomical objects with a resolution roughly one order magnitude better than current broad band surveys. To accomplish this, new large field view camera (PAUCam) has been designed, built, commissioned now operated at William Herschel Telescope (WHT). With WHT Prime Focus corrector, covers ~1-degree diameter Field View (FoV), which, only inner ~40...
We present the precision measurements of 11 years daily cosmic positron fluxes in rigidity range from 1.00 to 41.9 GV based on 3.4×10^{6} positrons collected with Alpha Magnetic Spectrometer (AMS) aboard International Space Station. The show distinctly different time variations electron at short and long timescales. A hysteresis between is observed a significance greater than 5σ rigidities below 8.5 GV. On contrary, proton similar variation. Remarkably, we found that are modulated more for 7...
The flow of baryons to and from a galaxy, which is fundamental for galaxy formation evolution, can be studied with galaxy-metal absorption system pairs. Our search galaxies around CIV systems at $z\sim5.7$ showed an excess photometric Lyman-$\alpha$ emitter (LAE) candidates in the fields J1030+0524 J1137+3549. Here we present spectroscopic follow-up 33 LAEs both fields. In first field, three out five within 10$h^{{-}1}$ projected comoving Mpc are $\pm500$ km s$^{{-}1}$...
Metal absorption systems are products of star formation. They believed to be associated with massive forming galaxies, which have significantly enriched their surroundings. To test this idea high column density CIV at z~5.7, we study the projected distribution galaxies and characterise environment in two independent quasar lines-of-sight: J103027.01+052455.0 J113717.73+354956.9. Using wide field photometry (~80x60h$^{-1}$ comoving Mpc), select bright (Muv(1350\AA)<-21.0 mag.) Lyman break...
We present the results from search for Lyman Alpha emitters (LAEs) in proximity of 11 CIV absorption systems at $z > 4.7$ spectrum QSO J1030+0524, using data MUSE. have found multiple LAE candidates close to four $z_{CIV} = 4.94$-5.74 with log$_{10}$(N CIV[cm$^{-2}$])$ 13.5.$ At z 5-6, W0(CIV) $> 0.2$ {\AA} seem more likely galaxies Ly${\alpha}$ emission within $\rho < 200$ proper kpc (4/5 cases), than W0(CIV)$ (0/6 cases). The impact parameter LAE-CIV equivalent widths 0.5 $ is range \rho...
We explore the expected galaxy environments of CIV absorbers at z>5 using Technicolor Dawn simulations. These simulations reproduce observed history reionization, z~6 stellar mass function, Ly$\alpha$ forest transmission z>5, and SiIV column density distribution (CDD) z~5.5. Nonetheless, CDD remains underproduced. Comparison with CII/SiII equivalent width ratios CII line incidence suggests that a low carbon yield accounts for some, but not all, discrepancy. Alternatively, density-bounded...
The authors develop a simple numerical method to integrate one-dimensional eigenvalue equations and apply it the calculation of critical screening parameters for screened Coulomb potentials. is based on propagation matrix solutions equation its accuracy easily systematically improved provided coefficients can be expanded in Taylor series about every point grid. They show results static exponential cosine
Abstract The KM3NeT neutrino telescope is currently being deployed at two different sites in the Mediterranean Sea. First searches for astrophysical neutrinos have been performed using data taken with partial detector configuration already operation. paper presents results of independent from compact binary mergers detected during third observing run LIGO and Virgo gravitational wave interferometers. first search looks a global increase counting rates that could be associated inverse beta...
Gamma-ray bursts are promising candidate sources of high-energy astrophysical neutrinos. The recent GRB 221009A event, identified as the brightest gamma-ray burst ever detected, provides a unique opportunity to investigate hadronic emissions involving KM3NeT undersea neutrino detectors participated in worldwide follow-up effort triggered by searching for events. In this letter, we summarize subsequent searches, wide energy range from MeV up few PeVs. No events found any searches performed....
We find a bright (L_{UV}=2.5 L*_{z=6}) Lyman alpha emitter at redshift z=5.719 projected distance of 79 physical kpc from strong triply ionized carbon (Civ) absorption system z=5.7238 previously reported in the spectrum z_{em} = 6.309 QSO SDSS J1030+0524. This is highest galaxy-absorber pair detected to-date, supporting idea that galaxy-wide outflows were already place end epoch reionization. The proximity this object makes it most likely source metals, consistent with models lower where...
Wireless small cell networks and device-to-device (D2D) communications are seen as two major features of next-generation wireless networks. In this paper, a novel approach for enabling D2D communication underlaid on network is proposed. Unlike existing works which focus performance analysis given chosen mode, in the strategic selection desired mode between pairs users studied. On one hand, using cells can provide reliable transmission but limited by interference backhaul constraints. other...
PAUCam is a large field of view camera designed to exploit the delivered by prime focus corrector William Herschel Telescope, at Observatorio del Roque de los Muchachos. One new features this its filter system, placed within few millimeters focal plane using eleven trays containing 40 narrow band and 6 broad filters, working in vacuum an operational temperature 250K focalized beam. In contribution, we describe performance these filters both characterization tests laboratory.
The measurement of cosmic rays at energies exceeding 100 TeV per nucleon is crucial for enhancing the understanding high-energy particle propagation and acceleration models in Galaxy. HERD a space-borne calorimetric experiment that aims to extend current direct measurements unexplored energies. payload scheduled be installed on Chinese Space Station 2027. primary peculiarity instrument its capability measure particles coming from all directions, with main detector being deep, homogeneous, 3D...
A finite-difference method for solving the Schrodinger eigenvalue equation is generalised in order to treat a larger number of potentials. Results are shown asymmetrical two-well oscillators.
Aims. We study the time an asteroid in a cometary orbit must wait to receive collision producing crater depth enough expose subsurface volatiles, aiming analyze possibility of collisional reactivation these objects if they are dormant comets.