Constraints on VHE gamma-ray emission of Flat Spectrum Radio Quasars with the MAGIC telescopes

Abstract

Flat spectrum radio quasars (FSRQs) constitute a class of jetted active galaxies characterized by a very luminous accretion disk, prominent and rapidly moving line-emitting cloud structures (Broad Line Region, BLR), and a surrounding dense dust structure known as dusty torus. The intense radiation field of the accretion disk strongly determines the observational properties of FSRQs. While hundreds of such sources have been detected at GeV energies, only a handful of them exhibit emission in the very-high-energy (VHE, E $\gtrsim 100$ GeV) range. This study presents the results and interpretation derived from a cumulative observation period of 174 hours dedicated to nine FSRQs conducted with the MAGIC telescopes from 2008 to 2020. Our findings indicate no statistically significant ($\ge$ 5 $\sigma$) signal for any of the studied sources, resulting in upper limits on the emission within the VHE energy range. In two of the sources, we derived quite stringent constraints on the $\gamma$-ray emission in the form of upper limits. Our analysis focuses on modeling the VHE emission of these two sources in search for hints of absorption signatures within the broad line region (BLR) radiation field. For these particular sources, constraints on the distance between the emission region and the central black hole are derived using a phenomenological model. Subsequently, these constraints are tested using a framework based on a leptonic model.

arXiv commentabout to be submitted to MNRAS

References in corpus (73)

• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• Unified Schemes for Radio-Loud Active Galactic Nuclei
• The Large Area Telescope on the Fermi Gamma-ray Space Telescope Mission
• The Swift X-ray Telescope
• The Swift Ultra-Violet/Optical Telescope
• The Burst Alert Telescope (BAT) on the Swift MIDEX Mission
• Fermi Large Area Telescope Fourth Source Catalog
• The Sloan Digital Sky Survey Quasar Catalog V. Seventh Data Release
• The Low-Luminosity End of the Radius-Luminosity Relationship for Active Galactic Nuclei
• Estimating Black Hole Masses in Active Galaxies Using the Halpha Emission Line
• Extragalactic Background Light Inferred from AEGIS Galaxy SED-type Fractions
• Limits and Confidence Intervals in the Presence of Nuisance Parameters
• The Radius-Luminosity Relationship for Active Galactic Nuclei: The Effect of Host-Galaxy Starlight on Luminosity Measurements II. The Full Sample of Reverberation-Mapped AGNs
• Incremental Fermi Large Area Telescope Fourth Source Catalog
• Modeling the Extragalactic Background Light from Stars and Dust
• The major upgrade of the MAGIC telescopes, Part II: A performance study using observations of the Crab Nebula
• The Sloan Digital Sky Survey Quasar Catalog: Fourteenth Data Release
• Very-High-Energy Gamma Rays from a Distant Quasar: How Transparent Is the Universe?
• MAGIC discovery of VHE Emission from the FSRQ PKS 1222+21
• Kinematics of Parsec-Scale Jets of Gamma-Ray Blazars at 43~GHz within the VLBA-BU-BLAZAR Program
• 3FHL: The Third Catalog of Hard Fermi-LAT Sources
• 2FHL: The Second Catalog of Hard Fermi-LAT Sources
• The major upgrade of the MAGIC telescopes, Part I: The hardware improvements and the commissioning of the system
• Performance of the MAGIC stereo system obtained with Crab Nebula data
• A Universal Scaling for the Energetics of Relativistic Jets From Black Hole Systems
• Spectroscopy of Broad Line Blazars from 1LAC
• Fermi Gamma-ray Space Telescope Observations of the Gamma-ray Outburst from 3C 454.3 in November 2010
• TeV candidate BL Lac objects
• The extragalactic background light revisited and the cosmic photon-photon opacity
• The unprecedented optical outburst of the quasar 3C 454.3. The WEBT campaign of 2004-2005
• Early Fermi Gamma-ray Space Telescope Observations of the Quasar 3C 454.3
• 1SXPS: A deep Swift X-ray Telescope point source catalog with light curves and spectra
• Transformation Properties of External Radiation Fields, Energy-Loss Rates and Scattered Spectra, and a Model for Blazar Variability
• Absorption of 10--200 Gev Gamma Rays by Radiation from BLR in Blazars
• An observational determination of the evolving extragalactic background light from the multiwavelength HST/CANDELS survey in the Fermi and CTA era
• Long-term optical monitoring of TeV emitting Blazars
• On the origin of gamma rays in Fermi blazars: beyond the broad line region
• The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope -- Data Release 3
• Characterizing the Gamma-Ray Variability of the Brightest Flat Spectrum Radio Quasars Observed with the Fermi LAT
• Very-high-energy gamma-rays from the Universe's middle age: detection of the z=0.940 blazar PKS 1441+25 with MAGIC
• The Central Engines of Fermi Blazars
• Detection of very high energy gamma-ray emission from the gravitationally-lensed blazar QSO B0218+357 with the MAGIC telescopes
• Observations of the Crab pulsar between 25 GeV and 100 GeV with the MAGIC I telescope
• Intrinsic $\gamma$-ray luminosity, black hole mass, jet and accretion in Fermi blazars
• Fermi Large Area Telescope Observations of the Cosmic-Ray Induced gamma-ray Emission of the Earth's Atmosphere
• The Second Data Release of the KODIAQ Survey
• Flux upper limits for 47 AGN observed with H.E.S.S. in 2004-2011
• Multi-wavelength observations of blazar AO 0235+164 in the 2008-2009 flaring state
• Exploring the blazar zone in High Energy flares of FSRQs
• Modeling the Extragalactic Background Light and the Cosmic Star Formation History
• Monitoring of the radio galaxy M87 during a low emission state from 2012 to 2015 with MAGIC
• Constraints on the emission region of 3C 279 during strong flares in 2014 and 2015 through VHE gamma-ray observations with H.E.S.S
• Leptonic and Hadronic Modeling of Fermi-LAT Hard Spectrum Quasars and Predictions for High-Energy Polarization
• Upper Limits from HESS AGN Observations in 2005-2007
• Upper limits from five years of blazar observations with the VERITAS Cherenkov telescopes
• agnpy: An open-source python package modelling the radiative processes of jetted active galactic nuclei
• The first catalog of Fermi-LAT sources below 100 MeV
• Spectroscopic monitoring of the BL Lac object AO 0235+164
• A Search for TeV Gamma-Ray Emission from High-Peaked Flat Spectrum Radio Quasars Using the Whipple Air-Cherenkov Telescope
• The magnetic field structure in CTA 102 from high resolution mm-VLBI observations during the flaring state in 2016-2017
• Gamma-rays from young radio galaxies and quasars
• VHE gamma-ray detection of FSRQ QSO B1420+326 and modeling of its enhanced broadband state in 2020
• Investigating the multiwavelength behaviour of the flat spectrum radio quasar CTA 102 during 2013-2017
• Systematic Physical Characterization of the Gamma-Ray Spectra of 2FHL Blazars
• MAGIC upper limits to the VHE gamma-ray flux of 3C454.3 in high emission state
• Correcting Imaging Atmospheric Cherenkov Telescope data with atmospheric profiles obtained with an elastic light detecting and ranging system
• Investigation of the Gamma-ray Spectrum of CTA 102 During the Exceptional Flaring State in 2016-2017
• Magnetic Field Strengths of the Synchrotron Self-Absorption Region in the Jet of CTA 102 During Radio Flares
• Multiwavelength study of the gravitationally lensed blazar QSO B0218+357 between 2016 and 2020
• The exceptional VHE gamma-ray outburst of PKS 1510-089 in May 2016
• Pair Cascades at the Edge of the Broad-Line Region Shaping the Gamma-Ray Spectrum of 3C 279
• AGN Reverberation Mapping
• Search for Very-High-Energy Gamma Rays from the z = 0.896 Quasar 4C +55.17 with the MAGIC telescopes