Cosmic Rays and Neutrinos in the Multi-Messenger Era

Session

POSTER SESSION 2

11 déc. 2024, 15:30

APC Laboratory (Paris)

69. High-energy neutrino astrophysics with the KM3NeT telescope

Mathieu Lamoureux (UCLouvain)

11/12/2024 15:30

KM3NeT is a neutrino telescope located in the depths of the Mediterranean Sea. It consists of two sites, ARCA (off the Sicilian coast of Capo Passero) dedicated to the study of astrophysical neutrinos and ORCA (off the French coast of Toulon), optimised for GeV - TeV energies.
The two detectors are still under construction and should be completed in the next few years. However, the first...

71. Status and prospects of the astrophysical GeV neutrino emission searches with IceCube and KM3NeT

Karlijn Kruiswijk (UCLouvain)

11/12/2024 15:40

In the last decade, neutrino telescopes have probed astrophysical sources to probe cosmic ray acceleration mechanisms and shine light on properties previously unseen. The main neutrino telescopes nowadays are IceCube in the Antarctic ice and KM3NeT under construction in the Mediterranean Sea. These Cherenkov based neutrino telescopes are specially built for neutrino astronomy at TeV and higher...

68. Search for GeV neutrino counterparts associated with high-energy IceCube neutrinos

Christoph Raab (UCLouvain)

11/12/2024 15:50

IceCube has made significant progress in identifying astrophysical sources of high-energy neutrinos. However, the majority of the astrophysical flux remains unexplained, prompting further investigation. To improve our understanding of this flux and its sources, it is important to investigate the presence of a component at lower neutrino energies. To this end, we propose a study that conducts...

74. Incorporating theoretical blazar models into neutrino stacking analyses with KM3NeT/ARCA

Francesco Carenini

11/12/2024 16:00

After IceCube’s identification of the blazar TXS 0506+056 as the first cosmic neutrino source candidate, blazars have started to be considered among the most promising neutrino source classes. An improvement of the observations is expected thanks to the development of next-generation neutrino telescopes, such as KM3NeT/ARCA. KM3NeT/ARCA is a deep-sea Cherenkov neutrino telescope currently...

75. Neutrino follow-up observations with the High Energy Stereoscopic System (HESS)

Ankur Sharma (Laboratoire Astroparticule et Cosmologie (APC), Paris)

11/12/2024 16:10

Realtime alerts have become a cornerstone of multi-messenger astronomy since the past decade. Electromagnetic (EM) observatories operating in various wavelength-bands regularly follow up alerts issued by other EM facilities and more commonly by the neutrino and gravitational wave (GW) observatories across the world. While the localization of GW wave alerts in the sky is rather large at...

76. Tracking the gas distribution in the Galactic Centre using neutrinos

Paul Chong Wa Lai (University College London, Mullard Space Science Laboratory)

11/12/2024 16:20

The Central Molecular Zone at the Galactic Centre hosts the most massive and densest molecular clouds in our Galaxy. The mass of the clouds could be inferred from the infrared emission of the dust, or line emissions from tracers like CS and CO, but different methods having different assumptions sometimes yield inconsistent results. We propose that neutrinos can act as a new gas tracer to...

81. Investigating the neutrino signatures of candidate neutrino-emitter blazars

Massimiliano Lincetto (University of Würzburg / DESY Zeuthen)

11/12/2024 16:30

Active galactic nuclei are compelling candidates for astrophysical neutrino sources, as suggested by the detection of a high-energy neutrino positionally consistent with the flaring blazar TXS 0506+056 and evidence of neutrino emission from the nearby Seyfert galaxy NGC 1068. Our recent studies based on the IceCube time-integrated sky maps provided evidence of a statistically significant...

66. Unveiling the hard X-ray emission of NGC 1068, a possible high energy neutrino source

Antoine Foisseau (AstroParticules et Cosmologie - APC)

11/12/2024 16:40

One of the central questions in high-energy astrophysics is the origin of high-energy
cosmic rays and neutrinos. The Seyfert 2 Compton-thick AGN NGC 1068 stands out as a
promising candidate for high-energy neutrino emission, with a significance level of 4.2𝜎.
Various models have been proposed to explain the multi-messenger emission associated
with this source. X-ray data are crucial for...

72. Fast Radio Burst Sources and Neutrinos in the Multi-Messenger Context

Felix Bretaudeau

11/12/2024 16:50

Fast Radio Bursts (FRBs) are millisecond-long electromagnetic emissions originating from extra-galactic sources, characterized by unprecedented energies in the radio domain. Their properties are consistent with the hypothesis of turbulent, highly magnetized, and dense media surrounding their sources. These sources are strong candidates for multi-messenger emissions, partly due to the huge...

73. Insights from modelling the brightest Fermi-LAT blazar flare

Egor Podlesnyi (NTNU)

11/12/2024 17:00

The electromagnetic flare of the flat-spectrum radio quasar (FSRQ) 3C 454.3 in November 2010 was the brightest $\gamma$-ray flare ever observed by the Fermi-LAT from a blazar. We performed the data analysis of the multiwavelength (from infrared photons to $\gamma$ rays) quasi-simultaneous 1-day-averaged spectral-energy distributions (SEDs) for seven days of the flare and modelled the...

80. J1048+7143: A Supermassive Black Hole Binary Candidate*

Ilja Jaroschewski (CEA/IRFU/DPHP)

11/12/2024 17:10

Coincident quasi-periodic oscillations are observed in the gamma-ray, optical and radio light curves from the blazer J1048+7143. While in gamma rays and optical, the flares consist of two subflares each, the radio emissions show a Gaussian-like flare structure.

Here, we show that all these flares are consistent with a supermassive binary black hole at the center of this blazar, caused by...