English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We present multiwavelength data of the blazar 3C 454.3 obtained during anextremely bright outburst from November 2010 through January 2011. Theseinclude flux density measurements with the Herschel Space Observatory at fivesubmillimeter-wave and far-infrared bands, the Fermi Large Area Telescope atgamma-ray energies, Swift at X-ray, ultraviolet (UV), and optical frequencies,and the Submillimeter Array at 1.3 mm. From this dataset, we form a series of52 spectral energy distributions (SEDs) spanning nearly two months that areunprecedented in time coverage and breadth of frequency. Discrete correlationanlaysis of the millimeter, far-infrared, and gamma-ray light curves show thatthe variations were essentially simultaneous, indicative of co-spatiality ofthe emission, at these wavebands. In contrast, differences in short-termfluctuations at various wavelengths imply the presence of inhomegeneities inphysical conditions across the source. We locate the site of the outburst inthe parsec-scale core, whose flux density as measured on 7 mm Very LongBaseline Array images increased by 70 percent during the first five weeks ofthe outburst. Based on these considerations and guided by the SEDs, we proposea model in which turbulent plasma crosses a conical standing shock in theparsec-scale region of the jet. Here, the high-energy emission in the model isproduced by inverse Compton scattering of seed photons supplied by eithernonthermal radiation from a Mach disk, thermal emission from hot dust, or (forX-rays) synchrotron radiation from plasma that crosses the standing shock. Forthe two dates on which we fitted the model SED to the data, the modelcorresponds very well to the observations at all bands except at X-rayenergies, where the spectrum is flatter than observed.

Multiwavelength Variations of 3C 454.3 during the November 2010 to January 2011 Outburst