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Investigating multiwavelength lognormality with simulations— case of Mrk 421

Chakraborty, N. (2020) Investigating multiwavelength lognormality with simulations— case of Mrk 421. Galaxies, 8 (1). e7. ISSN 2075-4434

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To link to this item DOI: 10.3390/galaxies8010007

Abstract/Summary

Blazars are highly variable and display complex characteristics. A key characteristic is the flux probability distribution function or flux PDF whose shape depends upon the form of the underlying physical process driving variability. The BL Lacertae Mrk 421 is one of the brightest and most variable blazars across the electromagnetic spectrum. It has been reported to show hints of lognormality across the spectrum from radio to gamma-ray histograms of observed fluxes. This would imply that the underlying mechanisms may not conform to the “standard” additive, multi-zone picture, but could potentially have multiplicative processes. This is investigated by testing the observed lightcurves at different wavelengths with time-series simulations. We find that the simulations reveal a more complex scenario, than a single lognormal distribution explaining the multiwavelength lightcurves of Mrk 421.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical, Physical and Computational Sciences > Department of Mathematics and Statistics
ID Code:88584
Uncontrolled Keywords:blazars, variability, lognormality, Mrk 421
Publisher:MDPI

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