Short-Timescale Variability of the Blazar Mrk 421 from AstroSat and Simultaneous Multi-Wavelength Observations
arXiv:2102.00919 · doi:10.1007/s12036-021-09709-3
Abstract
We study the multi-wavelength variability of the blazar Mrk 421 at minutes to days timescales using simultaneous data at -rays from Fermi, 0.7-20 keV energies from AstroSat, and optical and near-infrared (NIR) wavelengths from ground-based observatories. We compute the shortest variability timescales at all of the above wavebands and find its value to be ~1.1 ks at the hard X-ray energies and increasingly longer at soft X-rays, optical and NIR wavelengths as well as at the GeV energies. We estimate the value of the magnetic field to be 0.5 Gauss and the maximum Lorentz factor of the emitting electrons ~1.6 x assuming that synchrotron radiation cooling drives the shortest variability timescale. Blazars vary at a large range of timescales often from minutes to years. These results, as obtained here from the very short end of the range of variability timescales of blazars, are a confirmation of the leptonic scenario and in particular the synchrotron origin of the X-ray emission from Mrk 421 by relativistic electrons of Lorentz factor as high as . This particular mode of confirmation has been possible using minutes to days timescale variability data obtained from AstroSat and simultaneous multi-wavelength observations.
arXiv comment8 pages, 2 figures, accepted for publication in the Journal of Astrophysics and Astronomy
References in corpus (29)
- Unified Schemes for Radio-Loud Active Galactic Nuclei
- Fermi Large Area Telescope Fourth Source Catalog
- On characterising the variability properties of X-ray light curves from active galaxies
- The Spectral Energy Distribution of Fermi bright blazars
- Leptonic and Hadronic Modeling of Fermi-Detected Blazars
- BL Lac Objects in the Synchrotron Proton Blazar Model
- Turbulent, Extreme Multi-Zone Model for Simulating Flux and Polarization Variability in Blazars
- A Proton Synchrotron Blazar Model for Flaring in Markarian~501
- Comptonization of Infrared Radiation from Hot Dust by Relativistic Jets in Quasars
- Gamma-ray Light Curves and Variability of Bright Fermi-Detected Blazars
- Fermi-LAT Observations of Markarian 421: the Missing Piece of its Spectral Energy Distribution
- SMARTS optical and infrared monitoring of 12 gamma-ray bright blazars
- Gamma-Ray Studies of Blazars: Synchro-Compton Analysis of Flat Spectrum Radio Quasars
- Calibration of the Large Area X-ray Proportional Counter (LAXPC) instrument on-board AstroSat
- Correlated Multi-Waveband Variability in the Blazar 3C~279 from 1996 to 2007
- Results of WEBT, VLBA and RXTE monitoring of 3C 279 during 2006-2007
- Timing Signatures of the Internal-Shock Model for Blazars
- Very Rapid High-Amplitude Gamma-ray Variability in Luminous Blazar PKS 1510-089 Studied with Fermi-LAT
- The spectral energy distribution of compact jets powered by internal shocks
- Two possible circumbinary planets in the eclipsing post-common envelope system NSVS 14256825
- Simultaneous X-Ray and Gamma-Ray Observations of TeV Blazars: Testing Synchro-Compton Emission Models and Probing the Infrared Extragalactic Background
- Synchrotron and Synchrotron Self-Compton Spectral Signatures and Blazar Emission Models
- Two Flares with One Shock: the Interesting Case of 3C 454.3
- Precursors in Short Gamma-ray Bursts as a Possible Probe of Progenitors
- Long term γ -ray variability of blazars
- Probing the Jets of Blazars Using the Temporal Symmetry of Their Multi-Wavelength Outbursts
- Large Area X-ray Proportional Counter (LAXPC) Instrument on AstroSat
- Time dependent spectral modeling of Markarian 421 during a violent outburst in 2010
- Physical Inference from the gamma-ray, X-Ray and Optical Time Variability of a Large Sample of Fermi Blazars