José Roberto Ángeles Camacho
A5102854958- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Radiation Detection and Scintillator Technologies
- Radio Astronomy Observations and Technology
- Radiation Therapy and Dosimetry
- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Particle Accelerators and Free-Electron Lasers
- Research on Leishmaniasis Studies
- Phenothiazines and Benzothiazines Synthesis and Activities
- Plant and animal studies
- Malaria Research and Control
- Evolutionary Game Theory and Cooperation
- Engineering and Information Technology
- Noncommutative and Quantum Gravity Theories
- Synthesis and Catalytic Reactions
- Cyclopropane Reaction Mechanisms
- Educational Research and Science Teaching
- Optical Coatings and Gratings
Universidad de Antioquia
2024
Campbell Collaboration
2021-2023
Universidad Nacional Autónoma de México
2010-2022
Autonomous University of Chiapas
2021
Central University of Venezuela
2007-2011
Universitat de València
2002
Universitat Autònoma de Barcelona
2001
We present the first catalog of gamma-ray sources emitting above 56 and 100 TeV with data from High Altitude Water Cherenkov (HAWC) Observatory, a wide field-of-view observatory capable detecting gamma rays up to few hundred TeV. Nine are observed TeV, all which likely Galactic in origin. Three continue past making this highest-energy source date. report integral flux each these objects. also spectra for three discuss possibility that they PeVatrons.
Abstract We present TeV gamma-ray observations of the Crab Nebula, standard reference source in ground-based astronomy, using data from High Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory. In this analysis we use two independent energy estimation methods that utilize extensive air shower variables such as core position, angle, and lateral distribution. contrast, previously published HAWC spectrum roughly estimated with only number photomultipliers triggered. This new methodology...
Abstract We present the detection of very-high-energy gamma-ray emission above 100 TeV from HAWC J2227+610 with High-Altitude Water Cherenov Gamma-Ray Observatory (HAWC) observatory. Combining our observations previously published results by Very Energetic Radiation Imaging Telescope Array System (VERTIAS), we interpret as protons a lower limit in their cutoff energy 800 TeV. The most likely source is associated supernova remnant G106.3+2.7, making it good candidate for Galactic PeVatron....
Because of the high energies and long distances to sources, astrophysical observations provide a unique opportunity test possible signatures Lorentz invariance violation (LIV). Superluminal LIV enables decay photons at energy. The altitude water Cherenkov (HAWC) observatory is among most sensitive gamma-ray instruments currently operating above 10 TeV. HAWC finds evidence 100 TeV photon emission from least four sources. These exclude, for strongest limits set, energy scale 2.2×10^{31} eV,...
Abstract The Earth is bombarded by ultrarelativistic particles, known as cosmic rays (CRs). CRs with energies up to a few PeV (=10 15 eV), the knee in particle spectrum, are believed have Galactic origin. One or more factories of CRs, PeVatrons, must thus be active within our Galaxy. direct detection protons from their sources not possible since they deflected magnetic fields. Hundred TeV γ -rays decaying π 0 , produced when collide ambient gas, can provide decisive evidence proton...
Abstract The highest-energy known gamma-ray sources are all located within 0.°5 of extremely powerful pulsars. This raises the question whether ultra-high-energy (UHE; >56 TeV) emission is a universal feature expected near pulsars with high spin-down power. Using four years data from High Altitude Water Cherenkov Gamma-Ray Observatory, we present joint-likelihood analysis 10 to search for subthreshold UHE correlated these locations. We report significant detection (>3 σ ), indicating...
A measurement with high statistics of the differential energy spectrum light elements in cosmic rays, particular, primary H plus He nuclei, is reported. The presented range from $6$ to $158$ TeV per nucleus. Data was collected High Altitude Water Cherenkov (HAWC) Observatory between June 2015 and 2019. analysis based on a Bayesian unfolding procedure, which applied subsample vertical HAWC data that enriched $82\%$ events induced by nuclei. To achieve mass separation, cut lateral age air...
Abstract We present a new catalog of TeV gamma-ray sources using 1523 days data from the High-Altitude Water Cherenkov (HAWC) Observatory. The represents most sensitive survey northern sky at energies above several TeV, with three times exposure compared to previous HAWC catalog, 2HWC. report 65 detected ≥5 σ significance, along positions and spectral fits for each source. contains eight that have no counterpart in 2HWC but are within 1° previously emitters, 20 more than away any Of these...
A three-step protocol for the synthesis of 1,2,3,8,9-pentasubstituted-5,6-dihydropyrrolo[2,1-a]isoquinolines is described, using van Leusen's polysubstituted pyrrole construction followed by intramolecular radical-oxidative cyclization isoquinoline system. The cytotoxic activities dihydropyrroloisoquinolines were tested on six tumor cell lines. Preliminary structure–activity studies revealed importance identity aromatic substituent at C-2 position, particularly a phenyl, m-(amino) phenyl or...
Abstract The High Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory continuously detects TeV photons and particles within its large field of view, accumulating every day a deeper exposure two-thirds the sky. We analyzed 1523 days HAWC live data acquired over four half years, in follow-up analysis 138 nearby ( z < 0.3) active galactic nuclei from Third Catalog Hard Fermi-LAT sources culminating 40° zenith at Sierra Negra, site. This search for persistent emission used...
Abstract We report TeV gamma-ray observations of the ultra-high-energy source MGRO J1908+06 using data from High Altitude Water Cherenkov Observatory. This is one highest-energy known sources, with emission extending past 200 TeV. Modeling suggests that bulk leptonic in nature, driven by energetic radio-faint pulsar PSR J1907+0602. Depending on what assumptions are included model, a hadronic component may also be allowed. Using results modeling, we discuss implications for detection...
Size distributions in some ecosystems follow a power behavior spanning up to ten orders of magnitude. A model for the origins this scaling is presented. The shows that intrinsic dynamics system leads law distribution, N(m) ∼ m−α, with α ≈ 2, agreement field data. We assume each individual eventually predator all smaller individual, thereby connecting elements food web among themselves. consider reproduction and death coming from predation natural mortality. It shown most important mechanism...
The High Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory surveys the very high energy sky in 300 GeV to $>100$ TeV range. HAWC has detected two blazars above $11\sigma$, Markarian 421 (Mrk 421) and 501 501). observations are comprised of data taken period between June 2015 July 2018, resulting a $\sim 1038$ days exposure. In this work we report time-averaged spectral analysis for both sources 0.5 TeV. Taking into account flux attenuation due extragalactic background light (EBL),...
We report resonant Raman scattering and photoluminescence (PL) measurements on two ZnTe thin films grown by molecular-beam epitaxy GaAs substrates with thicknesses around 0.5 1.0 μm. The data have been obtained using the different excitation energies of an Ar+ laser to distinguish from PL analyze effects. characteristic features low-temperature spectra are light heavy free exciton emissions, split due thermal strain effect, followed several phonon replicas these lines. Moreover, longitudinal...
The open-source Multi-Mission Maximum likelihood (3ML) Framework allows for the common analysis of diverse datasets. ability to consistently fit and characterize astronomical data across many decades in energy is key understanding origin emission we measure with different instruments. 3ML uses plugins encapsulate interfaces instrument response functions. user can then define a model one or multiple sources describe given region interest. determine locations, spatial shapes, spectra model....
The High Altitude Water Cherenkov (HAWC) and IceCube observatories, through the Astrophysical Multimessenger Observatory Network (AMON) framework, have developed a multimessenger joint search for extragalactic astrophysical sources. This analysis looks sources that emit both cosmic neutrinos gamma rays are produced in photo-hadronic or hadronic interactions. AMON system is running continuously, receiving sub-threshold data (i.e. not suited on its own to do searches) from HAWC IceCube,...
List of proceedings from the HAWC Collaboration presented at 36th International Cosmic Ray Conference, 24 July - 1 August 2019, Madison, Wisconsin, USA.
The Galactic gamma-ray diffuse emission is produced by the interaction of cosmic rays with ambient gas and electromagnetic radiation fields in interstellar medium (ISM). Studying this helps reconstruct particle transport mechanisms distribution Galaxy. In work, we analyze TeV a chosen region plane using data collected High Altitude Water Cherenkov (HAWC) detector. energy spatial distributions have been studied after subtracting extended point sources detected greater than 5 sigma...
Abstract magnified image A series of thieno[ 2 ,3‐ b ]quinolone derivatives were synthesized and investigated for their abilities to inhibit β‐hematin formation, hemoglobin hydrolysis in vivo efficacy rodent Plasmodium berghei. Compound 3b was the most promising as inhibitor hydrolysis, its effects formation promising. When aromatic ring substituted (Me), 3 (CF ) or 2,4 (Cl) inhibition proteolysis maximal (88%), rest compounds maintained a low inhibition. The active compound emerge vitro...
Current knowledge of the relative abundances and energy spectra elemental mass groups cosmic rays in $10$ TeV - $1$ PeV interval is uncertain. This situation prevents carrying out precision tests that may lead to distinguish among existing hypotheses on origin propagation galaxy. In order learn more about composition these particles, we have employed HAWC data from hadron induced air showers determine three rays: protons, helium heavy nuclei with $Z > 2$. The were estimated by using Gold...
Microquasars with high-mass companion stars are promising very-high-energy (VHE; 0.1-100 TeV) gamma-ray emitters, but their behaviors above 10 TeV poorly known. Using the High Altitude Water Cherenkov (HAWC) observatory, we search for excess emission coincident positions of known microquasars (HMMQs). No significant is observed LS 5039, Cygnus X-1, X-3, and SS 433 1,523 days HAWC data. We set most stringent limit obtained to date on each individual source. Under assumption that HMMQs produce...