Fast radio bursts 'twists and shouts' help scientists determine source of cosmic blasts

ScienceDaily | 1/10/2018 | Staff
kimberly163 (Posted by) Level 3
The research is featured on the cover of Nature, Jan. 11.

The "shouting" represents the bursts, and the "twisting" describes a physical phenomenon called Faraday rotation, which occurs as radio waves pass through a magnetized plasma, explained James Cordes, the George Feldstein Professor of Astronomy at Cornell University. Measurement of the twisting provides further scientific detail on the origin of FRB 121102. The data was culled from the Arecibo Observatory in Puerto Rico and confirmed by Green Bank Observatory in West Virginia.

Years - Measurements - Surroundings - Source - Cordes

"It's remote sensing from 3 billion light years away. These new measurements allow us to be much more specific about the immediate surroundings of the source," said Cordes.

When radio waves pass through magnetized plasma, the direction of polarization at different radio frequencies become "twisted" by the Faraday rotation.

Radio - Bursts - FRB - Twist - Times

The radio bursts from FRB 121102 twist to such an extreme - more than 500 times greater any other fast radio burst observed to date - that astronomers concluded the bursts must pass through a high magnetic field in dense plasma, making scientists believe that the youthful source of the FRB 121102 bursts may be close to a massive black hole in its own galaxy or a young neutron star cradled within a powerful nebula or a supernova remnant.

"We estimate the magnetic field and gas density surrounding the blast source, and we can link them, for example, with a model involving a young magnetar - a neutron star with an especially large magnetic field - to the central engine that produces the bursts," Cordes said. The radio source and its environment are unique, which indicates a new type of object not seen previously.

Eavesdropping - Ear - Heavens - Arecibo - Observatory

Like an enormous eavesdropping ear on the deep heavens, the Arecibo Observatory is Earth's largest single-aperture radio telescope, tuned to find pulsars and transient sources, and to observe everything from galaxies...
(Excerpt) Read more at: ScienceDaily
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