Very High-energy Gamma-Ray Episodic Activity of Radio Galaxy NGC 1275 in 2022-2023 Measured with MACE

Abstract

The radio galaxy NGC 1275, located at the central region of Perseus cluster, is a well-known very high-energy (VHE) gamma-ray emitter. The Major Atmospheric Cherenkov Experiment Telescope has detected two distinct episodes of VHE (E > 80 GeV) gamma-ray emission from NGC 1275 during 2022 December and 2023 January. The second outburst, observed on 2023 January 10, was the more intense of the two, with flux reaching 58$\%$ of the Crab Nebula flux above 80 GeV. The differential energy spectrum measured between 80 GeV and 1.5 TeV can be described by a power law with a spectral index of $\Gamma =-2.90\pm 0.16_{stat}$ for both flaring events. The broadband spectral energy distribution derived from these flares, along with quasisimultaneous low-energy counterparts, suggests that the observed gamma-ray emission can be explained using a homogeneous single-zone synchrotron self-Compton model. The physical parameters derived from this model for both flaring states are similar. The intermediate state observed between two flaring episodes is explained by a lower Doppler factor or magnetic field, which subsequently returned to its previous value during the high-activity state observed on 2023 January 10.

arXiv comment7 Pages, 5 Figures, and 1 Table

References in corpus (39)

• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• The Large Area Telescope on the Fermi Gamma-ray Space Telescope Mission
• The Swift X-ray Telescope
• The Swift Ultra-Violet/Optical Telescope
• A Search for "Dwarf" Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies
• MOJAVE: Monitoring of Jets in Active Galactic Nuclei with VLBA Experiments. VI. Kinematics Analysis of a Complete Sample of Blazar Jets
• Constraints on the Physical Parameters of TeV Blazars
• The Updated Zwicky Catalog (UZC)
• Development of the Model of Galactic Interstellar Emission for Standard Point-Source Analysis of Fermi Large Area Telescope Data
• A connection between star formation activity and cosmic rays in the starburst galaxy M 82
• Insights Into the High-Energy Gamma-ray Emission of Markarian 501 from Extensive Multifrequency Observations in the Fermi Era
• TeV BL Lac objects at the dawn of the Fermi era
• Fast TeV variability from misaligned minijets in the jet of M87
• Production of TeV gamma-radiation in the vicinity of the supermassive black hole in the giant radiogalaxy M87
• Spine-sheath layer radiative interplay in subparsec-scale jets and the TeV emission from M87
• MAGIC Gamma-ray Telescope Observation of the Perseus Cluster of Galaxies: implications for cosmic rays, dark matter, and NGC1275
• The First Swift Ultra-Violet/Optical Telescope GRB Afterglow Catalog
• The Chandra view of the 3C/FRI sample of low luminosity radio-galaxies
• Kinematics and Excitation of the Molecular Hydrogen Accretion Disc in NGC 1275
• VLBI Monitoring of 3C 84 (NGC 1275) in Early Phase of the 2005 Outburst
• Is the core of M87 the source of its TeV emission? Implications for unified schemes
• VERITAS Observations of day-scale flaring of M87 in 2010 April
• Rapid and multi-band variability of the TeV-bright active nucleus of the galaxy IC 310
• High energy gamma-ray properties of the FR I radio galaxy NGC 1275
• On the spine-layer scenario for the very high-energy emission of NGC 1275
• Resolving acceleration to very high energies along the Jet of Centaurus A
• Discovery of a new subparsec counterjet in NGC 1275: the inclination angle and the environment
• The environment and distribution of emitting electrons as a function of source activity in Markarian 421
• Gamma-ray flaring activity of NGC 1275 in 2016-2017 measured by MAGIC
• The $\gamma$-ray spectrum of the core of Centaurus A as observed with H.E.S.S. and Fermi-LAT
• Radio Galaxies at VHE energies
• Rapid Gamma-ray variability of NGC 1275
• Emitting electrons and source activity in Markarian 501
• The origins of the gamma-ray flux variations of NGC 1275 based on 8 years of Fermi-LAT observations
• Magnetospheric Gamma-Ray Emission in Active Galactic Nuclei
• VERITAS Discovery of VHE Emission from the Radio Galaxy 3C 264: A Multi-Wavelength Study
• Observations of the Crab Nebula with MACE (Major Atmospheric Cherenkov Experiment)
• Origin of the UV to X-ray emission of radio galaxy NGC 1275 explored by analyzing its variability
• Multiwavelength monitoring of NGC 1275 over a decade: Evidence of a shift in synchrotron peak frequency and long-term multi-band flux increase