Electron Acceleration and Time Variability of High Energy Emission from Blazars

Abstract

Blazars are known to emit a broad band emission from radio to gamma-rays with rapid time variations, particularly, in X- and gamma-rays. Synchrotron radiation and inverse Compton scattering are thought to play an important role in emission and the time variations are likely related to the acceleration of nonthermal electrons. As simultaneous multiwavelength observations with continuous time spans are recently available, some characteristics of electron acceleration are possibly inferred from the spectral changes of high energy emission. In order to make such inferences, we solve the time-dependent kinetic equations of electrons and photons simultaneously using a simple model for electron acceleration. We then show how the time variations of emission are dependent on electron acceleration. We also present a simple model for a flare in X-rays and TeV gamma-rays by temporarily changing the acceleration timescale. Our model will be used, in future, to analyze observed data in detail to obtain information on electron acceleration in blazars.

24 pages, 12 figures, accepted by the Astrophysical Journal

Cited by in corpus (48)

• Leptonic and Hadronic Modeling of Fermi-Detected Blazars
• Comptonization of Infrared Radiation from Hot Dust by Relativistic Jets in Quasars
• Modeling the Emission Processes in Blazars
• X-Ray Spectral Variability Signatures of Flares in BL Lac Objects
• Time Dependent Modeling of the Markarian 501 X-ray and TeV Gamma-Ray Data Taken During March and April, 1997
• Timing Signatures of the Internal-Shock Model for Blazars
• Characteristic X-ray Variability of TeV Blazars: Probing the Link between the Jet and the Central Engine
• Four Years Monitoring of Blazar PKS 2155-304 with BeppoSAX: Probing the Dynamics of the Jet
• Coordinated Multiwavelength Observations of BL Lacertae in 2000
• The WEBT Campaign on the Blazar 3C279 in 2006
• Time-Dependent Models for Blazar Emissions with the Second-Order Fermi Acceleration
• Day-Scale Variability of 3C 279 and Searches for Correlations in Gamma-Ray, X-Ray, and Optical Bands
• A hadronic synchrotron mirror model for the "orphan" TeV flare in 1ES 1959+650
• Emitting electrons spectra and acceleration processes in the jet of Mrk 421: from low state to giant flare state
• Does the Blazar Gamma-Ray Spectrum Harden with Increasing Flux? Analysis of 9 Years of EGRET Data
• Radio/X-ray Offsets of Large Scale Jets Caused by Synchrotron Time Lags
• The Most Intensive Gamma-Ray Flare of Quasar 3C 279 with the Second-Order Fermi Acceleration
• Modeling the Multiwavelength Spectra and Variability of BL Lacertae in 2000
• Rapid TeV Flaring in Markarian 501
• On the rapid TeV flaring activity of Markarian 501
• Rapid Synchrotron Flares from BL Lacertae Detected by ASCA and RXTE
• Modelling rapid TeV variability of PKS 2155-304
• Brightest Fermi-LAT Flares of PKS 1222+216: Implications on Emission and Acceleration Processes
• X-ray Intraday Variability of the TeV Blazar PKS 2155-304 with Suzaku During 2005-2014
• An expanding one-zone model for studying blazars emission
• Synchrotron Self-Compton Emission by Relativistic Electrons under Stochastic Acceleration: Application to Mrk 421 and Mrk 501
• The relentless variability of Mrk 421 from the TeV to the radio
• Modeling the Spectral Energy Distribution and Variability of 3C 66A during the WEBT campaign of 2003 -- 2004
• A Structured Leptonic Jet Model of the "Orphan" TeV Gamma-Ray Flares in TeV Blazars
• Verification of the diffusive shock acceleration in Mrk 501
• Emitting Electron Spectra and Acceleration Processes in the Jet of PKS 0447-439
• X-ray Intraday Variability of HBL Blazars with XMM-Newton
• Synchrotron Blob Model of Infrared and X-ray Flares from Sagittarius A${}^{\ast }$
• Formation of very hard electron and gamma-ray spectra of flat spectrum radio quasar in fast-cooling regime
• Understanding the General Feature of Microvariability in $Kepler$ Blazar W2R 1926$+$42
• Exploring the Nature of the 2016 γ-ray Emission in the Blazar 1749+096
• Unfolding the X-ray Spectral Curvature of Mkn 421 for Further Clues
• Synchrotron Self-Compton Model for PKS 2155-304
• X-ray variability patterns in blazars
• Long-term multi-band photometric monitoring of Mrk 501
• Blob ejection from advection-dominated accretion flow: observational consequences
• The Electron Spectrum in 3C279 and the Observed Emission Spectrum
• Blob Ejection from Advection-dominated Accretion Flow II: the Multiwavelength Properties of Light Curves
• Hard MeV-GeV spectra of blazars
• Constraining the redshifts of TeV BL Lac objects
• Correlated Short-Timescale Hard-Soft X-ray Variability of the Blazars Mrk 421 and 1ES 1959+650 using $\text{AstroSat}$
• Advection of Accelerated Electrons in Radio/X-ray Knots of AGN Jets
• Progress in Multiwavelength and Multi-Messenger Observations of Blazars and Theoretical Challenges