We report on the discovery of a new fast radio burst (FRB), FRB 150215, with the Parkes radio telescope on 2015 February 15. The burst was detected in real time with a dispersion measure (DM) of 1105.6 Â± 0.8 pc cm-3, a pulse duration of 2.8+1.2-0.5ms, and a measured peak flux density assuming that the burst was at beam centre of 0.7+0.2-0.1Jy. The FRB originated at a Galactic longitude and latitude of 24.66Â°, 5.28Â° and 25Â° away from the Galactic Center. The burst was found to be 43 Â± 5 per cent linearly polarized with a rotation measure (RM) in the range -9 < RM < 12 radm-2(95 per cent confidence level), consistent with zero. The burst was followed up with 11 telescopes to search for radio, optical, X-ray, Î³ -ray and neutrino emission. Neither transient nor variable emission was found to be associated with the burst and no repeat pulses have been observed in 17.25 h of observing. The sightline to the burst is close to the Galactic plane and the observed physical properties of FRB 150215 demonstrate the existence of sight lines of anomalously low RM for a given electron column density. The Galactic RM foreground may approach a null value due to magnetic field reversals along the line of sight, a decreased total electron column density from the Milky Way, or some combination of these effects. A lower Galactic DM contribution might explain why this burst was detectable whereas previous searches at low latitude have had lower detection rates than those out of the plane.
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|Titolo:||A polarized fast radio burst at low Galactic latitude|
|Data di pubblicazione:||2017|
|Appare nelle tipologie:||01.01 - Articolo su rivista|