Intrinsic GeV-TeV gamma-ray emission from EHSP blazars
arXiv:1907.11443
Abstract
Extremely High Synchrotron Peak (EHSP) blazars are observed to form a small population of sources with high energy hump peaking at TeV energies in their broad-band spectral energy distributions. The observed gamma-ray emission from these sources at GeV-TeV energies is described by unusual hard spectral indices. The observed spectral and temporal characteristics of these sources challenge the standard leptonic models for the broad-band emissions from blazars. Therefore, such sources provide astrophysical sites to investigate directly the particle acceleration, cooling of relativistic particles and indirectly probe the cosmological quantities like extragalactic background light (EBL) and intergalactic magnetic field (IMF) in the Universe. In this study, we investigate the spectral properties of the gamma-ray emission from EHSP blazars using observations from the Fermi-LAT catalogues (3FGL and 3FHL) along with the TeV observations using ground based telescopes. The observed TeV gamma-ray spectra are corrected for the EBL absorption using the most recent and updated EBL models to determine the intrinsic spectrum at the source. The intrinsic TeV spectra are combined with the MeV-GeV observations from the Fermi-LAT to study the gamma-ray emission from EHSP blazars in the broad energy band. The intrinsic gamma-ray spectra are then used to estimate the position of high energy peak in the spectral energy distribution. We also present the qualitative description for the observed spectral properties of EHSP blazars using different physical scenarios and discuss their importance for the upcoming CTA observatory.
arXiv comment36th International Cosmic Ray Conference Madison, WI, U.S.A.: Proceedings of Science, PoS (ICRC2019) 603
References in corpus (17)
- The Spectral Energy Distribution of Fermi bright blazars
- Leptonic and Hadronic Modeling of Fermi-Detected Blazars
- Modeling the Extragalactic Background Light from Stars and Dust
- Variable VHE gamma-ray emission from Markarian 501
- 3FHL: The Third Catalog of Hard Fermi-LAT Sources
- Modeling the Emission Processes in Blazars
- A hadronic origin for ultra-high-frequency-peaked BL Lac objects
- Role of line-of-sight cosmic ray interactions in forming the spectra of distant blazars in TeV gamma rays and high-energy neutrinos
- Formation of hard VHE gamma-ray spectra of blazars due to internal photon-photon absorption
- On the Location of the Gamma-ray Emission in the 2008 Outburst in the BL Lacertae Object AO 0235+164 through Observations across the Electromagnetic Spectrum
- Formation of hard very-high energy spectra of blazars in leptonic models
- The Hard VHE Gamma-ray Emission in High-Redshift TeV Blazars: Comptonization of Cosmic Microwave Background Radiation in an Extended Jet?
- A Three-Year Multi-Wavelength Study of the Very High Energy Gamma-ray Blazar 1ES 0229+200
- The Discovery of gamma-Ray Emission From The Blazar RGB J0710+591
- Multiwavelength observations of the AGN 1ES 0414+009 with VERITAS, Fermi-LAT, Swift-XRT, and MDM
- Intrinsic VHE Gamma-ray spectra of Blazars as a probe for Extragalactic Background Light
- Extremely High energy peaked BL Lac nature of the TeV blazar Mrk 501