J. Linnemann
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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: 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: 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: 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 long-term spectral evolution and X-ray and Gamma-ray correlation of blazars seen by HAWC
Study of long-term spectral evolution and X-ray and Gamma-ray correlation of blazars seen by HAWC Open
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…
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: Primordial Black Holes
Primordial Black Holes 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: Observation of the Galactic Center PeVatron Beyond 100 TeV with HAWC
Observation of the Galactic Center PeVatron Beyond 100 TeV with HAWC Open
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…
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: 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: Discovery of Gamma Rays from the Quiescent Sun with HAWC
Discovery of Gamma Rays from the Quiescent Sun with HAWC Open
We report the first detection of a TeV γ-ray flux from the solar disk (6.3σ), based on 6.1 years of data from the High Altitude Water Cherenkov (HAWC) observatory. The 0.5-2.6 TeV spectrum is well fit by a power law, dN/dE=A(E/1 TeV)^{-γ},…
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…
View article: The Boomerang PWN and its SNR G106.3+2.7 Viewed in the Very-High-Energy Gamma-Ray Regime by the HAWC Observatory
The Boomerang PWN and its SNR G106.3+2.7 Viewed in the Very-High-Energy Gamma-Ray Regime by the HAWC Observatory Open
Supernova remnant (SNR) G106.3+2.7, home to the Boomerang pulsar wind nebula (PWN), has long been thought to be a cosmic-ray PeVatron. However, its close proximity to the Boomerang PWN and the lack of gamma-ray (GR) observations above 30 T…
View article: A Spectral, Morphological, and Emission Analysis of Gamma Ray Source HAWC J2031+415
A Spectral, Morphological, and Emission Analysis of Gamma Ray Source HAWC J2031+415 Open
The Cygnus Cocoon region is a complex region that contains an OB star cluster that is prominent in the TeV energy range. First observed by HEGRA as the unassociated TeV source TeV J2032+4130, follow-up observations with the High-Altitude W…
View article: Constraining the TeV halo population in M31
Constraining the TeV halo population in M31 Open
TeV halos are a new class of $\\gamma$-ray sources recently observed around some middle-aged pulsars. They are extended $\\gamma$-ray emission regions with a size bigger than the Pulsar Wind Nebulae but smaller than a Supernova Remnant. Se…
View article: Recent results from the High Altitude Water Cherenkov Observatory
Recent results from the High Altitude Water Cherenkov Observatory Open
High energy gamma-ray observations are an essential probe of cosmic-ray acceleration mechanisms. The detection of the highest energy gamma rays and the shortest timescales of variability are the key to improve our understanding of the acce…
View article: Beyond the Standard Model with HAWC
Beyond the Standard Model with HAWC Open
The High Altitude Water Cherenkov (HAWC) Gamma-ray Observatory, located in the mountains of Mexico, has been performing an unbiased survey of the Northern sky at energies above 300 GeV since becoming fully operational in 2015. HAWC’s wide …
View article: Revealing Ultra-High-Energy Gamma-Ray Emission from the eHWC J1825-134 Region with HAWC
Revealing Ultra-High-Energy Gamma-Ray Emission from the eHWC J1825-134 Region with HAWC Open
Located in the southern field of view of the High Altitude Water Cherenkov (HAWC) observatory, the eHWC J1825-134 region is one of the most complicated gamma-ray emission sites on the galactic plane. The region contains a few PeVatron cand…
View article: Identifying Short Gamma-Ray Bursts with potential delayed TeV Afterglows as possible counterparts to gravitational waves
Identifying Short Gamma-Ray Bursts with potential delayed TeV Afterglows as possible counterparts to gravitational waves Open
The connection between short Gamma-Ray Bursts (sGRBs) and Gravitational Waves (GWs) has long been a subject of study, motivating the search for counterparts by gamma-ray instruments. Both phenomena are thought to be produced by the same as…