J. A. García-González

HAWC Performance Enhanced by Machine Learning in Gamma-hadron Separation Open

R. Alfaro, C. Álvarez, Amado Andrés, E. Anita-Rangel, Miguel Araya , et al. · 2025

Improving gamma-hadron separation is one of the most effective ways to enhance the performance of ground-based gamma-ray observatories. With more than a decade of continuous operation, the High-Altitude Water Cherenkov (HAWC) Observatory h…

Study of the IC 443 Region with the HAWC Observatory Open

R. Alfaro, C. Alvarez, Miguel Araya, J. C. Arteaga-Velázquez, D. Avila Rojas , et al. · 2025

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…

HAWC, VERITAS, Fermi-LAT, and XMM-Newton Follow-up Observations of the Unidentified Ultra-high-energy Gamma-Ray Source LHAASO J2108+5157 Open

C. B. Adams, P. Bangale, W. Benbow, J. H. Buckley, Y. Chen , et al. · 2025

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…

Probing the mass composition of TeV cosmic rays with HAWC Open

Juan Carlos Arteaga Velázquez, R. Alfaro, C. Alvarez, Ana de Andrés, E. Anita-Rangel , et al. · 2025

Combined dark matter search towards dwarf spheroidal galaxies with Fermi-LAT, HAWC, H.E.S.S., MAGIC, and VERITAS Open

S. Abdollahi, L Baldini, R Bellazzini, B. Berenji, E. Bissaldi , et al. · 2025

Dwarf spheroidal galaxies (dSphs) are excellent targets for indirect dark matter (DM) searches using gamma-ray telescopes because they are thought to have high DM content and a low astrophysical background. The sensitivity of these searche…

Orbital Modulation of Gamma Rays up to 100 TeV from LS 5039 Open

R. Alfaro, Miguel Araya, J. C. Arteaga-Velázquez, D. Avila Rojas, H. A. Ayala Solares , et al. · 2025

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…

OP0065 Cancer Risk in Patients with Rheumatoid Arthritis Receiving Biologic and Targeted Synthetic Disease Modifying Antirheumatic Drugs: Data from a Multicenter National Real-World Registry Open

J. Molina Collada, L. Otero-Varela, Paloma Vela, Sara Manrique‐Arija, Celia Erausquin , et al. · 2025

ABS0131 GENDER DIFFERENCES IN RHEUMATOID ARTHRITIS: A RETROSPECTIVE STUDY ON DRUG RETENTION AND SAFETY IN BIOLOGIC AND TARGETED SYNTHETIC DMARDs Open

Blanca Varas de Dios, L. Otero-Varela, Paloma Vela, L. Cáceres Martín, Sara Manrique‐Arija , et al. · 2025

C02. INFECCIONES ASOCIADAS A DISPOSITIVOS CARDIACOS IMPLANTABLES EN UN HOSPITAL DE TERCER NIVEL: EXPERIENCIA DE 5 AÑOS Open

imp. Fuentenebro, M.A. Cañas, J. A. García-González, G. Cuervo, Marta Hernández‐Meneses , et al. · 2025

Extended TeV Halos May Commonly Exist around Middle-Aged Pulsars Open

A. Albert, R. Alfaro, C. Álvarez, J. C. Arteaga-Velázquez, D. Avila Rojas , et al. · 2025

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…

Absence of TeV halos around millisecond pulsars Open

A. U. Abeysekara, R. Alfaro, C. Álvarez, J. C. Arteaga-Velázquez, D. Avila Rojas , et al. · 2025

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…

Study of Long-term Spectral Evolution and X-Ray and <i>γ</i>-Ray Correlation of Blazars Seen by HAWC Open

R. Alfaro, C. Alvarez, Amado Andrés, J. C. Arteaga-Velázquez, D. Avila Rojas , et al. · 2025

The HAWC Observatory collected 6 yr of extensive data, providing an ideal platform for long-term monitoring of blazars in the very high energy (VHE) band, without bias toward specific flux states. HAWC continuously monitors blazar activity…

Study of long-term spectral evolution and X-ray and Gamma-ray correlation of blazars seen by HAWC Open

R. Alfaro, C. Alvarez, Amado Andrés, J. C. Arteaga-Velázquez, D. Avila Rojas , et al. · 2025

The HAWC Observatory collected 6 years of extensive data, providing an ideal platform for long-term monitoring of blazars in the Very High Energy (VHE) band, without bias towards specific flux states. HAWC continuously monitors blazar acti…

Study of the IC 443 region with the HAWC observatory Open

R. Alfaro, C. Alvarez, Miguel Araya, J. C. Arteaga‐Velázquez, D. Avila Rojas , et al. · 2025

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…

Analysis of the Emission and Morphology of the Pulsar Wind Nebula Candidate HAWC J2031+415 Open

R. Alfaro, C. Álvarez, J. C. Arteaga‐Velázquez, D. Avila Rojas, H. A. Ayala Solares , et al. · 2024

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…

Spectral Study of Very-high-energy Gamma Rays from SS 433 with HAWC Open

R. Alfaro, C. Alvarez, J. C. Arteaga-Velázquez, D. Avila Rojas, H. A. Ayala Solares , et al. · 2024

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 …

Spectral study of very high energy gamma rays from SS 433 with HAWC Open

R. Alfaro, C. Alvarez, J. C. Arteaga-Velázquez, D. Avila Rojas, H. A. Ayala Solares , et al. · 2024

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 …

Ultra-high-energy gamma-ray bubble around microquasar V4641 Sgr Open

R. Alfaro, C. Alvarez, J. C. Arteaga-Velázquez, D. Avila Rojas, H. A. Ayala Solares , et al. · 2024

Precise Measurements of TeV Halos around Geminga and Monogem Pulsars with HAWC Open

A. Albert, R. Alfaro, C. Álvarez, J. C. Arteaga-Velázquez, D. Avila Rojas , et al. · 2024

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+…

Testing the molecular cloud paradigm for ultra-high-energy gamma ray emission from the direction of SNR G106.3+2.7 Open

R. Alfaro, C. Alvarez, J. C. Arteaga‐Velázquez, D. Avila Rojas, H. A. Ayala Solares , et al. · 2024

Context. Supernova remnants (SNRs) are believed to be capable of accelerating cosmic rays (CRs) to PeV energies. SNR G106.3+2.7 is a prime PeVatron candidate. It is formed by a head region, where the pulsar J2229+6114 and its boomerang-sha…

Observation of the Galactic Center PeVatron beyond 100 TeV with HAWC Open

A. Albert, R. Alfaro, C. Alvarez, Amado Andrés, J. C. Arteaga-Velázquez , et al. · 2024

We report an observation of ultrahigh-energy (UHE) gamma rays from the Galactic center (GC) region, using 7 yr of data collected by the High-Altitude Water Cherenkov (HAWC) Observatory. The HAWC data are best described as a point-like sour…

Performance of the HAWC Observatory and TeV Gamma-Ray Measurements of the Crab Nebula with Improved Extensive Air Shower Reconstruction Algorithms Open

A. Albert, R. Alfaro, C. Álvarez, Amado Andrés, J. C. Arteaga-Velázquez , et al. · 2024

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…

TeV Analysis of a Source-rich Region with the HAWC Observatory: Is HESS J1809-193 a Potential Hadronic PeVatron? Open

A. Albert, R. Alfaro, C. Álvarez, J. C. Arteaga‐Velázquez, D. Avila Rojas , et al. · 2024

HESS J1809-193 is an unidentified TeV source, first detected by the High Energy Stereoscopic System (H.E.S.S.) collaboration. The emission originates in a source-rich region that includes several supernova remnants (SNRs) and pulsars inclu…

Testing the Molecular Cloud Paradigm for Ultra-High-Energy Gamma Ray Emission from the Direction of SNR G106.3+2.7 Open

R. Alfaro, C. Alvarez, J. C. Arteaga-Velázquez, D. Avila Rojas, H. A. Ayala Solares , et al. · 2024

Supernova remnants (SNRs) are believed to be capable of accelerating cosmic rays (CRs) to PeV energies. SNR G106.3+2.7 is a prime PeVatron candidate. It is formed by a head region, where the pulsar J2229+6114 and its boomerang-shaped pulsa…

TeV Analysis of a Source Rich Region with HAWC Observatory: Is HESS J1809-193 a Potential Hadronic PeVatron? Open

A. Albert, R. Alfaro, C. Álvarez, J. C. Arteaga-Velázquez, D. Avila Rojas , et al. · 2024

HESS J1809-193 is an unidentified TeV source, first detected by the High Energy Stereoscopic System (H.E.S.S.) Collaboration. The emission originates in a source-rich region that includes several Supernova Remnants (SNR) and Pulsars (PSR) …

Observation of the Galactic Center PeVatron Beyond 100 TeV with HAWC Open

A. Albert, R. Alfaro, C. Alvarez, Amado Andrés, J. C. Arteaga-Velázquez , et al. · 2024

We report an observation of ultra-high energy (UHE) gamma rays from the Galactic Center region, using seven years of data collected by the High-Altitude Water Cherenkov (HAWC) Observatory. The HAWC data are best described as a point-like s…

Analysis of the Emission and Morphology of the Pulsar Wind Nebula Candidate HAWC J2031+415 Open

R. Alfaro, C. Alvarez, J. C. Arteaga-Velázquez, D. Avila Rojas, H. A. Ayala Solares , et al. · 2024

The first TeV gamma-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 gamma-ray source whose emission has previously been re…

Performance of the HAWC Observatory and TeV Gamma-Ray Measurements of the Crab Nebula with Improved Extensive Air Shower Reconstruction Algorithms Open

A. Albert, R. Alfaro, C. Álvarez, Ana de Andrés, J. C. Arteaga-Velázquez , et al. · 2024

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…

Search for joint multimessenger signals from potential galactic cosmic-ray accelerators with HAWC and IceCube Open

R. Alfaro, C. Alvarez, J. C. Arteaga-Velázquez, D. Avila Rojas, H. A. Ayala Solares , et al. · 2024

The origin of high-energy galactic cosmic rays is yet to be understood, but some galactic cosmic-ray accelerators can accelerate cosmic rays up to PeV energies. The high-energy cosmic rays are expected to interact with the surrounding mate…

Exploring the Coronal Magnetic Field with Galactic Cosmic Rays: The Sun Shadow Observed by HAWC Open

R. Alfaro, C. Álvarez, J. C. Arteaga‐Velázquez, K. P. Arunbabu, D. Avila Rojas , et al. · 2024

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…

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