The blazar TXS 0506+056 was the first astrophysical source to be associated with high-energy neutrinos, both temporally and spatially. This breakthrough followed the detection of a high-energy neutrino coincident with the blazar’s 2017 multi-wavelength flare. Additionally, IceCube has identified TXS 0506+056 as the second most prominent hotspot in the neutrino sky over 9.5 years of...
X-ray observations are essential for understanding the emission mechanisms of active galactic nuclei (AGN), particularly blazars, whose X-ray emission predominantly follow a power-law model originating from relativistic jets oriented toward Earth. In this study, we present a detailed analysis of the candidate neutrino-emitting blazar 5BZB J0630-2406, which has been observed over multiple...
IceCube has recently discovered a neutrino diffuse emission from the Galactic Plane up to the PeV.
The spectrum of that emission is significantly higher and harder than expected to be generated by the cosmic ray (CR) population of the Galaxy if that is computed using conventional transport models.
Rather it is in good agreement with the KRA$_\gamma$ model adopting spatial dependent...
Recent observations highlight the importance of active galactic nuclei (AGN) in the context of high-energy neutrino production.
The focus of this study is 5BZB J1150+2417, which was recently proposed as associated with neutrino emission during the first $9$-yrs of IceCube observations among other blazar-type sources.
To test the proposed neutrino-blazar association we perform a...
I will discuss recent advancements in AGNpy, a Python library designed for modeling radiative processes in Active Galactic Nuclei (AGNs). I will highlight several enhancements, including preparation for incorporating time-dependent modeling to better integrate energy loss mechanisms. Additionally, I will explore a multi-layer structure for the Broad-Line Region to improve modeling accuracy for...
In the presentation, I will discuss the results of a comprehensive
multi-wavelength investigation of gamma-ray-bright BL Lac objects, utilizing data from the Fermi Large Area Telescope (LAT) and the Swift Observatory (XRT and UVOT) to analyze spectral energy distributions (SEDs) and temporal characteristics of these sources. The research focuses on a sample of bright and highly variable BL...
The low-luminosity radio galaxy NGC 4278, with parsec-scale jets, was recently identified as a TeV source by the LHAASO collaboration during the 2020-2021 campaign. It is the first of its class detected above 100 GeV, challenging current models of particle acceleration in low-power radio galaxies.
In this contribution, we present the analysis of the LAT data in the region of 1LHAASO...
The interactions of ultra-high energy cosmic ray nuclei (UHECR) in astrophysical scenarios can be of stochastic or deterministic nature. Simulation frameworks often employ Monte Carlo techniques or numerically solve systems of ordinary differential equations (ODEs) to describe such interactions and the resulting nuclear cascades. Monte Carlo approaches are best suited to asses the impact of...
GAMERA is an open-source software package for modelling non-thermal ra-
diation processes. It has been used in various publications to model the time
evolution of populations of leptonic and hadronic cosmic rays in constant and
changing environments and to compute the resulting photon and secondary par-
ticle spectra. While the core is written in C++ to allow fast computations, a
Python...
We will present developments towards the DIPLODOCUS code (Distribution In PLateaux methodOLOgy for the Computation of Boltzmann eqUationS), written from scratch using the Julia coding language, and designed to kinetically model dynamics and emissions from AGN jets and other jetted sources. The code expands on the concept of multi-zone jet models to include anisotropic distributions in momentum...
We use PLUTO (Mignone et al., 2007) relativistic hydrodynamics (RHD) simulations to connect information about electron energy spectra to the ages and fuelling processes of active galactic nuclei (AGN). We adapt the Lagrangian particle module (Vaidya et al, 2018 and Mukherjee et al, 2021) to model emission from RHD simulations without explicitly evolving the magnetic fields. We further adapt...
We present a theoretical model for detecting axions from neutrons stars in a QCD phase of quark matter. The axions would be produced from a quark-antiquark pair $u\bar{u}$ or $d\bar{d}$, in loop(s) involving gluons. The chiral anomaly of QCD and the spontaneously broken symmetry are invoked to explain the non-conservation of the axion current. From the coupling form factors, the axion...
Black hole-neutron star (NSBH) coalescence events are regarded as highly significant phenomena within the current multimessenger framework of gravitational waves,
and they are poised to assume an increasingly prominent role in the foreseeable future. To date, only a handful of such events have been observed,
with GW200105 and GW200115 being the most noteworthy among them. However, with the...
I will present progress on the development of the radiation module of cuHARM, a finite volume code which solves the general relativistic radiation magnetohydrodynamic equations in curved space-time. The specific intensity is resolved in frequency and in direction on a geodesic grid. I will describe the challenges linked to this discretization, which does not rely on the widely used M1 or M2...
