Real-time detection of an extreme scattering event: Constraints on Galactic plasma lenses

  title={Real-time detection of an extreme scattering event: Constraints on Galactic plasma lenses},
  author={Keith W. Bannister and Jamie Stevens and Artem V. Tuntsov and Mark A. Walker and Simon Johnston and Cormac Reynolds and Hayley E. Bignall},
  pages={354 - 356}
Identifying live radio scattering events Radio emissions from distant quasars are occasionally modified for a few weeks by foreground interstellar plasma, in an extreme scattering event (ESE). Understanding this process has been difficult, because existing techniques do not allow events to be identified fast enough for follow-up before they finish. Bannister et al. developed a radio survey technique that allows ESEs to be identified in real time. After finding their first live ESE, they… 
Extreme scattering events towards two young pulsars
We have measured the scintillation properties of 151 young, energetic pulsars with the Parkes radio telescope and have identified two extreme scattering events (ESEs). Towards PSR J1057-5226 we
Plasma microlensing dynamic spectrum probing fine structures in the ionized interstellar medium
  • Xun Shi, Zhuo Xu
  • Physics
    Monthly Notices of the Royal Astronomical Society
  • 2021
Gravitational microlensing has become a mature technique for discovering small gravitational lenses in the Universe that are otherwise beyond our detection limits. Similarly, plasma microlensing
Extreme scattering events from axisymmetric plasma lenses
Frequency-dependent brightness fluctuations of radio sources, the so-called extreme scattering events (ESEs), have been observed over the last three decades. They are caused by Galactic plasma
Radio-interferometric monitoring of FRB 131104: A coincident AGN flare, but no evidence for a cosmic fireball
The localization of fast radio bursts (FRBs) has been hindered by the poor angular resolution of the detection observations and inconclusive identification of transient or variable counterparts.
A radio transient with unusually slow periodic emission.
The high-frequency radio sky is bursting with synchrotron transients from massive stellar explosions and accretion events, but the low-frequency radio sky has, so far, been quiet beyond the Galactic
Extreme radio-wave scattering associated with hot stars
We use data on extreme radio scintillation to demonstrate that this phenomenon is associated with hot stars in the solar neighbourhood. The ionized gas responsible for the scattering is found at
Precision Orbital Dynamics from Interstellar Scintillation Arcs for PSR J0437–4715
Intensity scintillations of radio pulsars are known to originate from interference between waves scattered by the electron density irregularities of interstellar plasma, often leading to parabolic
A comparison of interferometric and single-dish methods to measure distances to pulsar scattering screens
Investigations of small-scale structure in the interstellar medium through pulsar scintillation and the use of scattering screens as interferometers to resolve pulsar emission regions rely on
The Peculiar Light Curve of J1415+1320: A Case Study in Extreme Scattering Events
The radio light curve of J1415+1320 (PKS 1413+135) shows time-symmetric and recurring U-shaped features across the centimeter-wave and millimeter-wave bands. The symmetry of these features points to
Flux density variability of 286 radio pulsars from a decade of monitoring
The Parkes telescope has been monitoring 286 radio pulsars approximately monthly since 2007 at an observing frequency of 1.4 GHz. The wide dispersion measure (DM) range of the pulsar sample and the


An extreme scattering event in the direction of the millisecond pulsar 1937 + 21
LARGE fluctuations in the radio emissions from the quasar 0954 + 658 (ref. 1) attest to the existence of large-scale inhomogeneities in the ionized interstellar medium. These fluctuations, termed
VLA Polarization Observations of the Extragalactic Source 1741-038 During an Extreme Scattering Event
The extragalactic radio source 1741-038 underwent an extreme scattering event in 1992. Near the middle of the event and 1.5 yr after the end of the event we obtained Faraday rotation observations of
VLBA observations of a rare multiple quasar imaging event caused by refraction in the interstellar medium
Aims. We have investigated highly atypical morphological parsec-scale changes in the flat spectrum extragalactic radio source 2023+335 which are coincident with an extreme scattering event (ESE) seen
Radio caustics from localized interstellar medium plasma structures
In a study of, 36 extragalactic radio sources observed over 7 years with the Green Bank interferometer at 2.7 GHz and 8.1 GHz, Fiedler et al.1 have detected unusual variations in the light curves of
Extreme scattering events caused by compact structures in the interstellar medium
Daily flux density measurements of 36 extragalactic radio sources over a seven year period reveal several unusual minima in the light curves that do not follow typical source variations. The
The Extreme Scattering Event toward 1741–038: H I Absorption
We report multi-epoch Very Large Array H I absorption observations of the source 1741-038 (OT -068) before and during an extreme scattering event (ESE). Observations at four epochs, three during the
A 3 Year Long Extreme Scattering Event in the Direction of the Millisecond Pulsar J1643-1224
An extreme scattering event (ESE) has been detected in the direction of the millisecond pulsar J1643-1224 at 1.28 and 1.41 GHz. Its duration is 3 years and this makes it the longest ESE ever
Extreme Scattering Events and Galactic Dark Matter
"Extreme scattering events" (ESEs) are attributed to radio wave refraction by a cloud of free electrons crossing the line of sight. We present a new model in which these electrons form the
A Search for Stellar Obscuration Events Due to Dark Clouds
The recent detections of a large population of faint submillimeter sources, an excess halo γ-ray background, and the extreme scattering events observed for extragalactic radio sources have been
A Very Rapid Extreme Scattering Event in the IDV Source 0954+658
Abstract Extreme scattering events (ESEs) are dramatic variations of the flux density at gigahertz frequencies caused by ray path distortions within an isolated inhomogeneity (‘plasma lens’) in the