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Blazars are a kind of highly variable source.


A blazar is an active galactic nucleus, a jet traveling at the speed of light composed of ionized matter, blazers are powerful sources of emission in the electromagnetic spectrum, seen as sources of high energy gamma ray photons. Blazars are a type of highly variable source, often passing over a short period of time, with flashes rapidly and dramatically. And some pulsating jets exhibit apparent motion, in which it travels with the material at a resultant speed of light, towards the observer.

Galaxies that have a compact field at the center, called the active galactic nucleus, are much higher than normal luminosity, even when the electromagnetic spectrum is lower than it is, the compact field shows that stars  Brightness is not produced with. Such additional non-stellar emission has been observed in radio, microwave, infrared, optical, ultra-violet, X-ray and gamma ray waves in the compact region, the area of ​​the compact is called AGN, the galaxies containing agn. They are called "active galaxies".

A new study has shown how active galactic nuclei are increasing the supermassive black hole material at the centers of galaxies, and emitting jets of AGN charged particles. The central black holes, how they transport large amounts of energy, and also radiate in the electromagnetic spectrum.

Blazar jets have two types of peak emission wavelengths, one charged from radio to X-rays, and are the result of charged particle acceleration, and the same particles charged on a very short wavelength, high energy gamma ray band. To collect various types of infrared "seed" photons from other sources.

After the launch of the Compton Gamma Ray Observatory in 1992, a bright explosion of radio emissions was first observed in 1978, during which gamma-ray variability was discovered, and the launch of the Fermi Gamma-Ray Space Telescope Mission 2008 continued  Comments enabled. The variability of Blast CTA102 was monitored from 2013-2017, to study it in depth. CfA astronomer Mark Gurvell and team of astronomers, together, used submillimetric arrays to measure particularly significant short (mm / sub mm) wavelengths, and the electromagnetic spectrum was expanded from radio to gamma rays.

In December 2016, the wavelength was seen to be flaring, which was 250 times brighter than its normal unconscious state. CTA102 entered a new phase of high gamma-ray activity, flaring with emission changes at all wavelengths.  Many detailed physical scenarios were proposed about this phenomenon, one of which was based on the change in geometric orientation of jets.

The researchers noted, in the new paper, that the two emission peaks with different geometric characteristics, originate from two different processes in which the geometric landscape can be tested, the same gamma-ray and optical current,  Similar particles in the jet are generated by the motions. The team of astronomers analyzed all available variability data from 2013–2017, and concluded how an inhomogeneous, rotating jet modified by changes in orientation makes the long-term flow of CTA102 in a simpler way, and the spectral evolution of  Can explain.

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