Using the Canadian Hydrogen Intensity Mapping Experiment – CHIME telescope, astronomers have identified eight new recurring fast radio burst (FRB) sources. The finding, reported in a paper published 9th August on arXiv.org, may shed new gentle on the origin and nature of those strange phenomena.
FRBs are intense bursts of radio emission milliseconds long and showcasing unique dispersion sweep of radio pulsars. The physical nature of those bursts is yet strange, and astronomers consider a variety of explanations starting from synchrotron maser emission from young magnetars in supernova remnants to cosmic string cusps.
Now, a staff of astronomers led by Bridget C. Andersen of McGill University in Montreal, reports the discovery of eight new FRB repeaters, which may imply a breakthrough in studies of these flaring events.
The newly discovered FRBs have dispersion measures varying from 103.5 to 1,281 parsecs/cm3. For the two FRBs with low dispersion measures, the astronomers cannot eliminate the likelihood that they’re galactic halo objects. Therefore, multi-wavelength follow-up observations for these sources are proposed to put constraints on their location.
The examine found that one of many eight new FRBs has a rotation measure of -115 rad/m2—a lot lower than that noticed for FRB 121102. This allowed the astronomers to attract initial conclusions about the characteristic properties of FRBs.
“This and the absence of a luminous persistent radio supply in Sources 1 and 2 uncertainty regions recommend not all repeaters share the environmental properties of FRB 121102,” the paper reads.
Furthermore, the researchers discovered that the repeating FRBs reported in the study generally have dispersion measures typical for the non-repeating FRBs so far recognized with CHIME. However, they do show evidence of getting more significant burst widths than non-repeating bursts. Based on the authors of the paper, may suggest different emission mechanisms in repeating and non-repeating sources.