S. Casanova
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View article: Longtime Monitoring of TeV Radio Galaxies with HAWC
Longtime Monitoring of TeV Radio Galaxies with HAWC Open
We present the monitoring of the TeV-emitting radio galaxies M87, NGC 1275, 3C 264, and IC 310 with the High-Altitude Water Cherenkov Observatory (HAWC) over a period of approximately 7.5 yr. The analysis includes light curves at daily, we…
View article: HAWC Performance Enhanced by Machine Learning in Gamma-hadron Separation
HAWC Performance Enhanced by Machine Learning in Gamma-hadron Separation Open
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…
View article: Search for Signatures of Dark Matter Annihilation in the Galactic Center with HAWC
Search for Signatures of Dark Matter Annihilation in the Galactic Center with HAWC Open
We conduct an indirect dark matter (DM) search in the Galactic Center, focusing on a square region within $\pm 9^{\circ}$ in Galactic longitude and latutide, using 2,865 days of data ($\sim$8 years) from the High-Altitude Water Cherenkov (…
View article: Combined dark matter search towards dwarf spheroidal galaxies with Fermi-LAT, HAWC, H.E.S.S., MAGIC, and VERITAS
Combined dark matter search towards dwarf spheroidal galaxies with Fermi-LAT, HAWC, H.E.S.S., MAGIC, and VERITAS Open
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…
View article: The SST-1M stereoscopic system
The SST-1M stereoscopic system Open
The Single-Mirror Small-Size Telescope (SST-1M) is an Imaging Atmospheric Cherenkov Telescope designed for detecting very high-energy gamma rays. With a compact design achieved through the adoption of silicon-photomultiplier pixels and a l…
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: H.E.S.S. programme searching for VHE gamma rays associated with FRBs
H.E.S.S. programme searching for VHE gamma rays associated with FRBs Open
Fast Radio Bursts (FRBs) are highly energetic, extremely short-lived bursts of radio flashes. Despite extensive research, the exact cause of these outbursts remains speculative. The high luminosity, short duration, and high dispersion meas…
View article: Observation of the Crab Nebula with the Single-Mirror Small-Size Telescope stereoscopic system at low altitude
Observation of the Crab Nebula with the Single-Mirror Small-Size Telescope stereoscopic system at low altitude Open
The Single-Mirror Small-Size Telescope (SST-1M) stereoscopic system is composed of two Imaging Atmospheric Cherenkov Telescopes (IACTs) designed to deliver optimal performance for gamma-ray astronomy in the multi-TeV energy range. It featu…
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: Orbital Modulation of Gamma-Rays Beyond 100 TeV from LS 5039
Orbital Modulation of Gamma-Rays Beyond 100 TeV from LS 5039 Open
Gamma-ray binaries are systems 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 accelerated to energi…
View article: The H.E.S.S. extragalactic sky survey with the first decade of observations
The H.E.S.S. extragalactic sky survey with the first decade of observations Open
The results of the first extragalactic gamma-ray survey by the High Energy Stereoscopic System (H.E.S.S.) are presented. The survey comprises 2720 hours of very high-energy gamma-ray observations of the extragalactic sky, recorded with H.E…
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: Detection of Extended X-Ray Emission around the PeVatron Microquasar V4641 Sgr with XRISM
Detection of Extended X-Ray Emission around the PeVatron Microquasar V4641 Sgr with XRISM Open
A recent report on the detection of very-high-energy gamma rays from V4641 Sagittarii (V4641 Sgr) up to ≈0.8 PeV has made it the second confirmed “PeVatron” microquasar. Here we report on the observation of V4641 Sgr with X-Ray Imaging and…
View article: Detection of extended X-ray emission around the PeVatron microquasar V4641 Sgr with XRISM
Detection of extended X-ray emission around the PeVatron microquasar V4641 Sgr with XRISM Open
A recent report on the detection of very-high-energy gamma rays from V4641 Sagittarii (V4641 Sgr) up to ~0.8 peta-electronvolt has made it the second confirmed "PeVatron" microquasar. Here we report on the observation of V4641 Sgr with X-R…
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: 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: The SST-1M imaging atmospheric Cherenkov telescope for gamma-ray astrophysics
The SST-1M imaging atmospheric Cherenkov telescope for gamma-ray astrophysics Open
The SST-1M is a Small-Sized Telescope (SST) designed to provide a cost-effective and high-performance solution for gamma-ray astrophysics, particularly for energies beyond a few TeV. The goal is to integrate this telescope into an array of…
View article: Testing the molecular cloud paradigm for ultra-high-energy gamma ray emission from the direction of SNR G106.3+2.7
Testing the molecular cloud paradigm for ultra-high-energy gamma ray emission from the direction of SNR G106.3+2.7 Open
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…