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Blobrana


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  NASA's WISE Mission Sees Skies Ablaze With Blazars

Astronomers are actively hunting a class of supermassive black holes throughout the universe called blazars thanks to data collected by NASA's Wide-field Infrared Survey Explorer (WISE). The mission has revealed more than 200 blazars and has the potential to find thousands more.
Blazars are among the most energetic objects in the universe. They consist of supermassive black holes actively "feeding," or pulling matter onto them, at the cores of giant galaxies. As the matter is dragged toward the supermassive hole, some of the energy is released in the form of jets traveling at nearly the speed of light. Blazars are unique because their jets are pointed directly at us.
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Blobrana


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Blazars
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Fast-acting astronomers have captured blazars in the act of spewing out material, providing new insights into these powerful phenomena.
Blazars are found in the middle of galaxies where supermassive black holes emit powerful jets of charged particles, at velocities close to the speed of light, directly towards the Earth.

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Blobrana


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Its a paradox of galactic proportions: from the midst of black holes, born of collapsed stars and known for their intense matter- and light-trapping gravity, astronomers have long detected massive jets of hot, ionised gas known as blazars shooting out at nearly the speed of light.

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Blobrana


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Supermassive Black Hole animation



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Blobrana


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Scientists say they have unlocked some of the secrets behind black holes, the gravitational fields known for sucking up light and stars from the universe.
In a report in the journal Nature, researchers say they have worked out how black holes emit jet streams of particles at close to light speed.
The University of Boston team say the streams originate in the magnetic field near the edge of the black hole.

Using an array of 10 powerful radio telescopes, aimed at the galaxy BL Lacertae, the researchers studied a black hole just as it was sending forth a blazar jet.

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Blobrana


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Title: A VLBI Search for the Origin of Wobbling in Blazar Jets
Authors: I. Agudo (Instituto de Astrofisica de Andalucia (CSIC), Granada, Spain)

An increasing number of blazars have been reported to show jet wobbling (i.e., non-regular rotations of the structural position angle of their innermost jets in the plane of the sky with amplitudes between 20 deg. and 50 deg., and time scales between 2 yr. and 20 yr.). The physical origin for the observed jet wobbling is still poorly understood, but as this phenomenon is triggered in the innermost regions of the jets, it must be tied to fundamental properties of the inner regions of the accretion system. Thus, jet wobbling may be an interesting potential tool for supermassive black hole, accretion and jet launching studies. As part of a joint theoretical/numerical and observational effort to characterize the observational properties and differences between these three possible scenarios we have started a long-term polarimetric phase-reference 43 GHz VLBA monitoring program to observe the jet structure and the absolute motion of the jet core of four of the blazars which have shown some of the clearest evidence of large amplitude jet wobbling: NRAO 150, OJ 287, 3C 273, and 3C 345 . Here we present this project and we argue about its suitability for future VSOP-2 observations.

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