Walter Winter
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View article: Constraining the Extragalactic Magnetic Field: Auger Data Meet UHECR Propagation Modeling
Constraining the Extragalactic Magnetic Field: Auger Data Meet UHECR Propagation Modeling Open
Recent analyses from the Pierre Auger Collaboration suggest correlations between the arrival directions of ultra-high-energy cosmic rays (UHECRs) and catalogs of starburst galaxies (SGBs) and jetted active galactic nuclei (AGNs). We revisi…
View article: Ultrahigh-energy Cosmic Rays from Neutrino-emitting Tidal Disruption Events
Ultrahigh-energy Cosmic Rays from Neutrino-emitting Tidal Disruption Events Open
We revisit ultrahigh-energy cosmic-ray (UHECR) production in tidal disruption events (TDEs) in light of recent evidence of neutrino-TDE associations. We use an isotropically emitting source-propagation model, which has been developed to de…
View article: Neutrino and Electromagnetic Signals from Tidal Disruption Events: Bridging the Theory with Observations
Neutrino and Electromagnetic Signals from Tidal Disruption Events: Bridging the Theory with Observations Open
This proceeding presents recent results from a joint analysis of time-dependent neutrino and electromagnetic emissions from tidal disruption events (TDEs), using both isotropic wind models and relativistic jets. We discuss constraints from…
View article: An Accretion Flare Interpretation for the UHE Neutrino Event KM3-230213A
An Accretion Flare Interpretation for the UHE Neutrino Event KM3-230213A Open
We study the origin of the ultra-high-energy (UHE) astrophysical neutrino event KM3-230213A detected by KM3NeT, focusing on MRC 0614-083 which has been pinpointed as the closest blazar to the neutrino localization. A joint interpretation o…
View article: Can the Neutrinos from TXS 0506+056 Have a Coronal Origin?
Can the Neutrinos from TXS 0506+056 Have a Coronal Origin? Open
The blazar TXS 0506+056 has been the first astrophysical source associated with high-energy astrophysical neutrinos, and it has emerged as the second-most-prominent hotspot in the neutrino sky over 10 yr of observations. Although neutrino …
View article: Revisiting X-Ray Afterglows of Jetted Tidal Disruption Events with the External Reverse Shock
Revisiting X-Ray Afterglows of Jetted Tidal Disruption Events with the External Reverse Shock Open
We investigate the external reverse shock (RS) region of relativistic jets as the origin of X-ray afterglows of jetted tidal disruption events (TDEs) that exhibit luminous jets accompanied by fast-declining nonthermal X-ray emissions. We m…
View article: Can the neutrinos from TXS 0506+056 have a coronal origin?
Can the neutrinos from TXS 0506+056 have a coronal origin? Open
The blazar TXS 0506+056 has been the first astrophysical source associated with high-energy astrophysical neutrinos, and it has emerged as the second-most-prominent hotspot in the neutrino sky over ten years of observations. Although neutr…
View article: Leptohadronic Scenarios for TeV Extensions of Gamma-Ray Burst Afterglow Spectra
Leptohadronic Scenarios for TeV Extensions of Gamma-Ray Burst Afterglow Spectra Open
Recent multiwavelength observations of gamma-ray burst afterglows observed in the TeV energy range challenge the simplest synchrotron self-Compton (SSC) interpretation of this emission and are consistent with a single power-law component s…
View article: A Comprehensive Hadronic Code Comparison for Active Galactic Nuclei
A Comprehensive Hadronic Code Comparison for Active Galactic Nuclei Open
We perform the first dedicated comparison of five hadronic codes (AM$^3$, ATHE$ν$A, B13, LeHa-Paris, and LeHaMoC) that have been extensively used in modeling of the spectral energy distribution (SED) of jetted active galactic nuclei. The p…
View article: Revisiting X-ray Afterglows of Jetted Tidal Disruption Events with the External Reverse Shock
Revisiting X-ray Afterglows of Jetted Tidal Disruption Events with the External Reverse Shock Open
We investigate the external reverse shock region of relativistic jets as the origin of X-ray afterglows of jetted tidal disruption events (TDEs) that exhibit luminous jets accompanied by fast-declining non-thermal X-ray emissions. We model…
View article: Ultra-High-Energy Cosmic Rays from Neutrino-Emitting Tidal Disruption Events
Ultra-High-Energy Cosmic Rays from Neutrino-Emitting Tidal Disruption Events Open
We revisit the Ultra-High-Energy Cosmic Ray (UHECRs) production in Tidal Disruption Events (TDEs) in the light of recent neutrino-TDE associations. We use an isotropically emitting source-propagation model, which has been developed to desc…
View article: AM<sup>3</sup>: An Open-source Tool for Time-dependent Lepto-hadronic Modeling of Astrophysical Sources
AM<sup>3</sup>: An Open-source Tool for Time-dependent Lepto-hadronic Modeling of Astrophysical Sources Open
We present the Astrophysical Multimessenger Modeling ( AM 3 ) software. AM 3 is a documented open-source software (source code at https://gitlab.desy.de/am3/am3 ; user guide and documentation at https://am3.readthedocs.io/en/latest/ ) that…
View article: Structured Jet Model for Multiwavelength Observations of the Jetted Tidal Disruption Event AT 2022cmc
Structured Jet Model for Multiwavelength Observations of the Jetted Tidal Disruption Event AT 2022cmc Open
AT 2022cmc is a recently documented tidal disruption event that exhibits a luminous jet, accompanied by fast-declining X-ray and long-lasting radio and millimeter emission. Motivated by the distinct spectral and temporal signatures between…
View article: AT2021lwx: Another Neutrino-coincident Tidal Disruption Event with a Strong Dust Echo?
AT2021lwx: Another Neutrino-coincident Tidal Disruption Event with a Strong Dust Echo? Open
We discuss the possible association of an astrophysical neutrino (IC220405B) with the recently reported, extremely energetic tidal disruption event (TDE) candidate AT2021lwx (ZTF20abrbeie, aka “Scary Barbie”) at redshift z = 0.995. Althoug…
View article: Sources of high-energy astrophysical neutrinos
Sources of high-energy astrophysical neutrinos Open
We discuss recent results in neutrino astronomy and their implications for the cosmic-ray acceleration in relativistic outflows, such as in Active Galactic Nuclei (AGN) jets, Gamma-Ray Bursts (GRBs), and Tidal Disruption Events (TDEs). We …
View article: ENUBET @ CERN
ENUBET @ CERN Open
Parallel Talk presented at the XX International Workshop on Neutrino Telescopes - Venice 23-27 October 2023 Abstract: The ENUBET project aims to design and experimentally demonstrate the concept of a monitored neutrino beam. These novel be…
View article: Constraints on the proton fraction of cosmic rays at the highest energies and the consequences for cosmogenic neutrinos and photons
Constraints on the proton fraction of cosmic rays at the highest energies and the consequences for cosmogenic neutrinos and photons Open
Over the last decade, observations have shown that the mean mass of ultra-high-energy cosmic rays (UHECRs) increases progressively toward the highest energies. However, the precise composition is still unknown and several theoretical studi…
View article: AT2021lwx: Another Neutrino-Coincident Tidal Disruption Event with a Strong Dust Echo?
AT2021lwx: Another Neutrino-Coincident Tidal Disruption Event with a Strong Dust Echo? Open
We discuss the possible association of an astrophysical neutrino (IC220405B) with the recently reported, extremely energetic tidal disruption event (TDE) candidate AT2021lwx (ZTF20abrbeie, aka ``Scary Barbie'') at redshift $z=0.995$. Altho…
View article: AM$^3$: An Open-Source Tool for Time-Dependent Lepto-Hadronic Modeling of Astrophysical Sources
AM$^3$: An Open-Source Tool for Time-Dependent Lepto-Hadronic Modeling of Astrophysical Sources Open
We present the AM$^3$ (``Astrophysical Multi-Messenger Modeling'') software, which has been successfully used in the past to simulate the multi-messenger emission, including neutrinos, from active galactic nuclei, including the blazar sub-…
View article: Leptohadronic Scenarios for TeV Extensions of Gamma-Ray Burst Afterglow Spectra
Leptohadronic Scenarios for TeV Extensions of Gamma-Ray Burst Afterglow Spectra Open
Recent multiwavelength observations of gamma-ray burst afterglows observed in the TeV energy range challenge the simplest synchrotron self-Compton (SSC) interpretation of this emission and are consistent with a single power-law component s…
View article: Sources of high-energy astrophysical neutrinos
Sources of high-energy astrophysical neutrinos Open
We discuss recent results in neutrino astronomy and their implications for the cosmic-ray acceleration in relativistic outflows, such as in Active Galactic Nuclei (AGN) jets, Gamma-Ray Bursts (GRBs), and Tidal Disruption Events (TDEs). We …
View article: Structured Jet Model for Multiwavelength Observations of the Jetted Tidal Disruption Event AT 2022cmc
Structured Jet Model for Multiwavelength Observations of the Jetted Tidal Disruption Event AT 2022cmc Open
AT 2022cmc is a recently documented tidal disruption event that exhibits a luminous jet, accompanied by fast-declining X-ray and long-lasting radio and millimeter emission. Motivated by the distinct spectral and temporal signatures between…
View article: Leptohadronic multi-messenger modeling of 324 gamma-ray blazars
Leptohadronic multi-messenger modeling of 324 gamma-ray blazars Open
Context. The origin of the diffuse astrophysical neutrino flux observed by the IceCube experiment is still under debate. Multiple associations have been reported between high-energy neutrino events and individual bla/ars, such as the sourc…
View article: Searches for dark matter decay with ultrahigh-energy neutrinos endure backgrounds
Searches for dark matter decay with ultrahigh-energy neutrinos endure backgrounds Open
Next-generation ultrahigh-energy (UHE) neutrino telescopes, presently under planning, will have the potential to probe the decay of heavy dark matter (DM) into UHE neutrinos, with energies in excess of ${10}^{7}\text{ }\text{ }\mathrm{GeV}…
View article: Electromagnetic Cascade Emission from Neutrino-coincident Tidal Disruption Events
Electromagnetic Cascade Emission from Neutrino-coincident Tidal Disruption Events Open
The potential association between Tidal Disruption Events and high-energy astrophysical neutrinos implies the acceleration of cosmic rays. These accelerated particles will initiate electromagnetic (EM) cascades spanning from keV to GeV ene…
View article: Differences between the Pierre Auger Observatory and Telescope Array Spectra: Systematic Effects or Indication of a Local Source of Ultra-high-energy Cosmic Rays?
Differences between the Pierre Auger Observatory and Telescope Array Spectra: Systematic Effects or Indication of a Local Source of Ultra-high-energy Cosmic Rays? Open
The Pierre Auger Observatory (PAO) and Telescope Array (TA) collaborations report significant differences in the observed energy spectra of ultra-high-energy cosmic rays (UHECRs) above 30 EeV. In this work we present a joint fit of TA and …
View article: Interpreting the activity of blazar PKS 0735+178 with particle interactions in the jet
Interpreting the activity of blazar PKS 0735+178 with particle interactions in the jet Open
In December 2021, the Fermi-LAT observed the brightest-ever gamma-ray flare from blazar PKS 0735+178. It was also accompanied by activity in optical, ultraviolet and X-rays. Moreover, the IceCube South Pole Neutrino Observatory and Baikal-…
View article: Modeling a large AGN sample to unveil the signatures of neutrino emission
Modeling a large AGN sample to unveil the signatures of neutrino emission Open
Active galactic nuclei (AGN) are one of the most promising classes of extragalactic cosmic-ray accelerators. This has been recently strengthened by increasing indications that AGN, and in particular blazars, may be sources of IceCube neutr…