H. León Vargas
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View article: Study of the IC 443 Region with the HAWC Observatory
Study of the IC 443 Region with the HAWC Observatory Open
Supernova remnants are one potential source class considered a PeVatron (i.e., capable of accelerating cosmic rays above PeV energies). The shock fronts produced after the explosion of the supernova are ideal regions for particle accelerat…
View article: Closure Relations of Synchrotron Self-Compton from Reverse shock and Fermi-LAT GRBs
Closure Relations of Synchrotron Self-Compton from Reverse shock and Fermi-LAT GRBs Open
Synchrotron radiation from the reverse- and forward-shock regions typically describes the evolution of temporal and spectral features given by the closure relations (CRs) during the late and long-/short-lasting emission in the afterglow ph…
View article: HAWC, VERITAS, Fermi-LAT, and XMM-Newton Follow-up Observations of the Unidentified Ultra-high-energy Gamma-Ray Source LHAASO J2108+5157
HAWC, VERITAS, Fermi-LAT, and XMM-Newton Follow-up Observations of the Unidentified Ultra-high-energy Gamma-Ray Source LHAASO J2108+5157 Open
We report observations of the ultra-high-energy gamma-ray source LHAASO J2108+5157, utilizing VERITAS, HAWC, Fermi-LAT, and XMM-Newton. VERITAS has collected ∼40 hr of data that we used to set ULs to the emission above 200 GeV. The HAWC da…
View article: Piritakua: the atmosphere as a high-energy physics laboratory
Piritakua: the atmosphere as a high-energy physics laboratory Open
View article: Search for seasonal variations of the horizontal muon rate with the HAWC observatory
Search for seasonal variations of the horizontal muon rate with the HAWC observatory Open
View article: Late-afterglow emission from a quasi-spherical outflow in a stratified environment
Late-afterglow emission from a quasi-spherical outflow in a stratified environment Open
Gamma-ray bursts (GRBs) are cosmic events occurring at large distances beyond our galaxy. They provide a unique opportunity to study electromagnetic patterns not seen elsewhere. When the collimated GRB outflow interacts with the outer laye…
View article: Closure relations of synchrotron self-Compton from reverse shock and <i>Fermi</i>-LAT GRBs
Closure relations of synchrotron self-Compton from reverse shock and <i>Fermi</i>-LAT GRBs Open
Synchrotron radiation from the reverse- and forward-shock regions typically describes the evolution of temporal and spectral features given by the closure relations (CRs) during the late and long-/short-lasting emission in the afterglow ph…
View article: Orbital Modulation of Gamma Rays up to 100 TeV from LS 5039
Orbital Modulation of Gamma Rays up to 100 TeV from LS 5039 Open
Gamma-ray binaries are luminous in gamma rays, composed of a compact object orbiting a massive companion star. The interaction between these two objects can drive relativistic outflows, either jets or winds, in which particles can be accel…
View article: Extended TeV Halos May Commonly Exist around Middle-Aged Pulsars
Extended TeV Halos May Commonly Exist around Middle-Aged Pulsars Open
Extended gamma-ray emission around isolated pulsars at TeV energies, also known as TeV halos, have been found around a handful of middle-aged pulsars. The halos are significantly more extended than their pulsar wind nebulae but much smalle…
View article: Absence of TeV halos around millisecond pulsars
Absence of TeV halos around millisecond pulsars Open
TeV halos are extended very-high-energy (VHE; 0.1-100 TeV) gamma-ray emission around middle-aged pulsars. So far they have only been found around isolated pulsars, but it has been suggested that they may also be powered by millisecond puls…
View article: Study of the IC 443 region with the HAWC observatory
Study of the IC 443 region with the HAWC observatory Open
Supernova remnants are one potential source class considered a PeVatron (i.e. capable of accelerating cosmic rays above PeV energies). The shock fronts produced after the explosion of the supernova are ideal regions for particle accelerati…
View article: Analysis of the Emission and Morphology of the Pulsar Wind Nebula Candidate HAWC J2031+415
Analysis of the Emission and Morphology of the Pulsar Wind Nebula Candidate HAWC J2031+415 Open
The first TeV γ -ray source with no lower energy counterparts, TeV J2032+4130, was discovered by HEGRA. It appears in the third HAWC catalog as 3HWC J2031+415 and it is a bright TeV γ -ray source whose emission has previously been resolved…
View article: Spectral Study of Very-high-energy Gamma Rays from SS 433 with HAWC
Spectral Study of Very-high-energy Gamma Rays from SS 433 with HAWC Open
Very-high-energy (0.1–100 TeV) gamma-ray emissions were observed in High-Altitude Water Cherenkov (HAWC) data from the lobes of the microquasar SS 433, making them the first set of astrophysical jets that were resolved at TeV energies. In …
View article: Spectral study of very high energy gamma rays from SS 433 with HAWC
Spectral study of very high energy gamma rays from SS 433 with HAWC Open
Very-high-energy (0.1-100 TeV) gamma-ray emission was observed in HAWC data from the lobes of the microquasar SS 433, making them the first set of astrophysical jets that were resolved at TeV energies. In this work, we update the analysis …
View article: Ultra-high-energy gamma-ray bubble around microquasar V4641 Sgr
Ultra-high-energy gamma-ray bubble around microquasar V4641 Sgr Open
View article: Precise Measurements of TeV Halos around Geminga and Monogem Pulsars with HAWC
Precise Measurements of TeV Halos around Geminga and Monogem Pulsars with HAWC Open
We present the most precise measurements to date for the spatial extension and energy spectrum of the γ -ray region between a pulsar’s wind nebula and the interstellar medium, better known as the halo, present around Geminga and PSR B0656+…
View article: Performance of the HAWC Observatory and TeV Gamma-Ray Measurements of the Crab Nebula with Improved Extensive Air Shower Reconstruction Algorithms
Performance of the HAWC Observatory and TeV Gamma-Ray Measurements of the Crab Nebula with Improved Extensive Air Shower Reconstruction Algorithms Open
The High-Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory, located on the side of the Sierra Negra volcano in Mexico, has been fully operational since 2015. The HAWC collaboration has recently significantly improved their extensive ai…
View article: Performance of the HAWC Observatory and TeV Gamma-Ray Measurements of the Crab Nebula with Improved Extensive Air Shower Reconstruction Algorithms
Performance of the HAWC Observatory and TeV Gamma-Ray Measurements of the Crab Nebula with Improved Extensive Air Shower Reconstruction Algorithms Open
The High-Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory located on the side of the Sierra Negra volcano in Mexico, has been fully operational since 2015. The HAWC collaboration has recently significantly improved their extensive-air…
View article: Exploring the Coronal Magnetic Field with Galactic Cosmic Rays: The Sun Shadow Observed by HAWC
Exploring the Coronal Magnetic Field with Galactic Cosmic Rays: The Sun Shadow Observed by HAWC Open
Galactic cosmic rays (GCRs) are charged particles that reach the heliosphere almost isotropically in a wide energy range. In the inner heliosphere, the GCR flux is modulated by solar activity so that only energetic GCRs reach the lower lay…
View article: Search for decaying dark matter in the Virgo cluster of galaxies with HAWC
Search for decaying dark matter in the Virgo cluster of galaxies with HAWC Open
The decay or annihilation of dark matter particles may produce a steady flux of very-high-energy gamma rays detectable above the diffuse background. Nearby clusters of galaxies provide excellent targets to search for the signatures of part…
View article: Galactic Gamma-Ray Diffuse Emission at TeV Energies with HAWC Data
Galactic Gamma-Ray Diffuse Emission at TeV Energies with HAWC Data Open
Galactic gamma-ray diffuse emission (GDE) is emitted by cosmic rays (CRs), ultra-relativistic protons, and electrons, interacting with gas and electromagnetic radiation fields in the interstellar medium. Here we present the analysis of ter…
View article: An optimized search for dark matter in the galactic halo with HAWC
An optimized search for dark matter in the galactic halo with HAWC Open
The Galactic Halo is a key target for indirect dark matter detection. The High Altitude Water Cherenkov (HAWC) observatory is a high-energy (∼300 GeV to >100 TeV) gamma-ray detector located in central Mexico. HAWC operates via the water Ch…
View article: Galactic Gamma-Ray Diffuse Emission at TeV energies with HAWC Data
Galactic Gamma-Ray Diffuse Emission at TeV energies with HAWC Data Open
The Galactic gamma-ray diffuse emission (GDE) is emitted by cosmic rays (CRs), ultra-relativistic protons and electrons, interacting with gas and electromagnetic radiation fields in the interstellar medium. Here we present the analysis of …
View article: Search for Decaying Dark Matter in the Virgo Cluster of Galaxies with HAWC
Search for Decaying Dark Matter in the Virgo Cluster of Galaxies with HAWC Open
The decay or annihilation of dark matter particles may produce a steady flux of very-high-energy gamma rays detectable above the diffuse background. Nearby clusters of galaxies provide excellent targets to search for the signatures of part…
View article: HAWC Study of the Very-high-energy γ-Ray Spectrum of HAWC J1844−034
HAWC Study of the Very-high-energy γ-Ray Spectrum of HAWC J1844−034 Open
Recently, the region surrounding eHWC J1842−035 has been studied extensively by γ-ray observatories due to its extended emission reaching up to a few hundred TeV and potential as a hadronic accelerator. In this work, we use 1910 days of cu…
View article: Observation of the Lamb wave created by the eruption of the Hunga volcano using cosmic rays detected by the HAWC observatory
Observation of the Lamb wave created by the eruption of the Hunga volcano using cosmic rays detected by the HAWC observatory Open
The explosion of the Hunga volcano on January 15, 2022 created a pressure wave that circled the\nglobe several times. The HAWC water Cherenkov detectors saw very clear variations in the count\nrate of particles from atmospheric showers for…
View article: ALPs searches with galactic sources using the HAWC Observatory.
ALPs searches with galactic sources using the HAWC Observatory. Open
Axion-like particles could be potential dark matter candidates, whose conversion from gamma rays could have an impact on the spectra of extremely powerful astronomical gamma-ray sources. For galactic sources, the overall result of this cou…
View article: Study of the HAWC counterpart of LHAASO J1849-0003 and its surroundings at TeV energies
Study of the HAWC counterpart of LHAASO J1849-0003 and its surroundings at TeV energies Open
LHAASO J1849-0003 is one of the twelve gamma-ray sources that can emit photons above 100 TeV reported by LHAASO in 2021. It is spatially coincident with HESS J1849-000, which may be powered by PSR J1849-0001. The High Altitude Water Cheren…
View article: TeV Halo Study of Geminga and Monogem with HAWC
TeV Halo Study of Geminga and Monogem with HAWC Open
Pulsar Inverse Compton halos (TeV halos) are a new subclass of gamma-ray sources. HAWC detected the first two candidates, Geminga and Monogem. These two candidates are of great interest to the anomalous positron excess observed by PAMELA, …
View article: Comparing HAWC blazars light curves with different data reconstruction versions
Comparing HAWC blazars light curves with different data reconstruction versions Open
We present a comparison of the flux normalization using two versions of the official data reconstruction used for HAWC analyses. Pass4 has been used so far for most of the results published by HAWC, in particular we are focusing in the Dai…