In a
paper submitted 24 Nov 2015 to arXiv, D.J. Champion et.al. reports
on the detection of five new fast radio bursts (FRBs) detected by the
High Time Resolution Universe high latitude survey using the Parkes
Radiotelescope.
Two of these bursts occurred 2.4ms apart, the first evidence of twin-components bursts.
Abstract here -
http://arxiv.org/abs/1511.07746
Full article here -
http://arxiv.org/pdf/1511.07746v1.pdf
Quote:
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Originally Posted by Swinburne Centre for Astrophysics and Supercomputing
Fast radio bursts are intense bursts of radio emission that have durations of milliseconds and exhibit the characteristic dispersion sweep of radio pulsars. The first was discovered in 2007 by Lorimer et al., although it was actually observed some six years earlier, in archival data from a pulsar survey of the Magellanic clouds. It was dubbed the “Lorimer Burst”.
Like giant pulses from radio pulsars like the Crab, the first burst was extremely intense (30 Jy peak flux) and observed across a 288 MHz radio band. The dispersion measure of the radio burst was 375 pc cm-3 and was near the location of the Small Magellanic Cloud. The limited dynamic range of the instrumentation prohibited an exact measure of the flux, but it has been estimated that several 100 bursts could occur every day with a small probability of detection.
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An article by Christopher Crockett entitled "More mysterious extragalactic signals detected" appears today at
www.sciencenews.org.
Quote:
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Originally Posted by Christopher Crockett, ScienceNews.org
Just in time for the holiday shopping season, astronomers snagged a two-for-one deal on mysterious blasts of radio waves from other galaxies. An unprecedented double burst recently showed up along with four more of these flashes, researchers report online November 25 at arXiv.org.
Fast radio bursts, first detected in 2007, are bright blasts of radio energy that last for just a few milliseconds and are never seen again (SN: 8/9/14, p. 22). Until now, astronomers had cataloged nine bursts that appeared to originate well outside the Milky Way. Yet, follow-up searches with nonradio telescopes for anything that might be pulsing or exploding keep coming up empty (SN Online: 12/8/14).
The five newcomers, detected at the Parkes radio telescope in Australia, follow the same pattern as all previous detected bursts with one exception — one flashed twice. Twin blasts separated by just 2.4 milliseconds came out of some sort of eruption that happened roughly 9 billion years ago in the constellation Octans, David Champion, an astronomer at the Max Planck Institute for Radio Astronomy in Bonn, Germany, and colleagues report.
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That article here -
https://www.sciencenews.org/article/...gnals-detected
