MessageToEagle.com – A team of astronomers has uncovered the most detailed record ever of a FRB (Fast Radio Burst).

Lasting only a fraction of a second yet packing a phenomenal amount of energy, FRBs are brief radio flashes of unknown origin that appear to come from random directions on the sky. These brilliant eruptions of cosmic radio waves, have baffled astronomers since they were first reported nearly a decade ago.

Though they appear to come from the distant Universe, none of these enigmatic events has revealed more than the slimmest details about how and where it formed, until now.

By poring over 650 hours of archival data from the National Science Foundation’s (NSF) Green Bank Telescope (GBT), a team of astronomers uncovered that the burst originated inside a highly magnetized region of space, possibly linking it to a recent supernova or the interior of an active star-forming nebula.

“We now know that the energy from this FRB passed through a dense, magnetized region shortly after it formed. This significantly narrows down the source’s environment and type of event that triggered the burst,” said Kiyoshi Masui, an astronomer with the University of British Columbia and the Canadian Institute for Advanced Research.

Though only a handful of FRBs have been documented previously, astronomers believe that the observable Universe is rocked by thousands of these events each day.

The astronomers found the newly identified FRB, dubbed FRB 110523, by using highly specialized software developed by Masui and his colleague Jonathan Sievers from the University of KwaZulu-Natal in Durban, South Africa.

The recorded data — a total of 40 terabytes — created a substantial analysis challenge, which was made even more difficult because the otherwise short, sharp signal of an FRB becomes “smeared out” in frequency by its journey through space. This smearing of the radio signal, known as dispersion delay, is often used to estimate distance in radio astronomy: the greater the dispersion, the further the object from Earth.

In this case, the dispersion measure suggests the FRB originated as far as 6 billion light-years away. Dispersion, however, masks the presence of an FRB within archival radio data.

The new software decreased the time required to analyze the data by counteracting the effects of dispersion, which restored the burst to its original appearance.

The software was used to conduct an initial pass of the GBT data to flag any candidate signal. This yielded more than 6,000 possible FRBs, which were individually inspected by team member Hsiu-Hsien Lin from Carnegie Mellon University in Pittsburgh. His analysis winnowed the field until only one candidate remained.

This one signal, however, was exceptional and contained more details about its polarization than any previously identified. Prior to this detection, only circular polarization was associated with an FRB. The new GBT study includes a detection of both circular and linear polarization.

“Hidden within an incredibly massive dataset, we found a very peculiar signal, one that matched all the known characteristics of a Fast Radio Burst, but with a tantalizing extra polarization element that we simply have never seen before,” said Jeffrey Peterson, a faculty member in Carnegie Mellon’s McWilliams Center for Cosmology.

Polarization is a property of electromagnetic radiation, including light and radio waves, and indicates the orientation of the wave. Polarizing sunglasses use this property to block out a portion of the Sun’s rays and 3-D movies use it to achieve the illusion of depth.

MessageToEagle.com

source: NRAO