INVESTIGATION OF SPECTRAL ENERGY DISTRIBUTION OF BLAZARS DETECTED IN GAMMA RAYS

• Grant number: 24/02267-9
• Support Opportunities: Regular Research Grants
• Start date: July 01, 2024
• End date: June 30, 2026
• Field of knowledge: Physical Sciences and Mathematics - Astronomy - Extragalactic Astrophysics
• Agreement: CNPq
• Principal Investigator: Edivaldo Moura Santos
• Grantee: Edivaldo Moura Santos
• Host Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• City of the host institution: São Paulo
• Associated research grant: 21/01089-1 - Cherenkov Telescope Array: Construction and First Discoveries, AP.ESP
• Associated scholarship(s): 24/14769-9 - Investigation of the spectral energy distribution of blazars detected in gamma rays, BP.JD

Abstract

Blazars are cosmic sources that present a spectral energy distribution that extends from radio to very high energies in several tens of TeV. The modeling of the spectral energy distribution at high energies of these sources considers two main emission mechanisms, leptonic and lepto-hadronic, which can describe the spectra observed for the two populations of blazars, that is, BL Lacertae (BL Lacs) and Flat-Spectrum Radio Quasars (FSRQs). However, both face difficulties, in particular in reproducing flare phenomena (very energetic phenomena) monitored with good multi-spectral and temporal coverage. The identification of the dominant particle acceleration mechanism and a better description of the location of the emitting zones in the TeV energy range are fundamental to break the degeneracies between the leptonic and lepto-hadronic models. Understanding the mechanisms of particle acceleration to ultra-relativistic energies is fundamental since the production of highly energetic radiation is associated with the acceleration processes of highly energetic cosmic rays, as well as the production of neutrinos. Comparison of multiwavelength observations of blazars with numerical models that calculate radioactive emissions from the source represents the main tool for probing the microphysics inside the source and its physical parameters (such as emission region and particle content). Therefore, the respective research project aims to model the spectral energy distribution of blazar sources detected in gamma rays and investigate the detectability of these sources with the Cherenkov Telescope Array observatory. (AU)

Scientific publications

(4)

(The scientific publications listed on this page originate from the Web of Science or SciELO databases. Their authors have cited FAPESP grant or fellowship project numbers awarded to Principal Investigators or Fellowship Recipients, whether or not they are among the authors. This information is collected automatically and retrieved directly from those bibliometric databases.)

STUANI PEREIRA, LUIZ AUGUSTO; SANTOS, RAIFF HUGO. Geant4-Based Characterization of Muon, Electron, Photon, and Hadron Signals from Atmospheric Showers in a Water Cherenkov Detector. INSTRUMENTS, v. 9, n. 4, p. 14-pg., 2025-11-24. (24/02267-9, 24/14769-9, 21/01089-1)

BERNARDO DA SILVA, SAMUEL VICTOR; STUANI PEREIRA, LUIZ AUGUSTO; DOS ANJOS, RITA DE CASSIA. Bethe-Heitler Cascades and Hard Gamma-Ray Spectra in Flaring TeV Blazars: 1ES 0414009 and 1ES 1959650. UNIVERSE, v. 11, n. 6, p. 18-pg., 2025-05-31. (21/01089-1, 24/14769-9, 24/02267-9)

TORRES, LUAN; PEREIRA, LUIZ AUGUSTO STUANI. Galactic Cosmic Ray Interaction with the Perseus Giant Molecular Cloud Using Geant4 Monte Carlo Simulation. UNIVERSE, v. 11, n. 7, p. 22-pg., 2025-07-02. (21/01089-1, 24/02267-9, 24/14769-9)

STUANI PEREIRA, LUIZ AUGUSTO; BERNARDO DA SILVA, SAMUEL VICTOR. From Gamma Rays to Cosmic Rays: Lepto-Hadronic Modeling of Blazar Sources as Candidates for Ultra-High-Energy Cosmic Rays. UNIVERSE, v. 11, n. 8, p. 18-pg., 2025-08-14. (24/02267-9, 24/14769-9, 21/01089-1)