Click here to view this collection in the new DAP user interface
Parkes observations for project P1007 semester 2019APRS_02
Recently, extreme plasma lensing of pulsar emission has been observed in two eclipsing binaries, PSR B1957+20 and PSR B1744-24A. These lensing events are an extremely sensitive probe of pulsar emission, resolving physical scales of ~10 km at the pulsar, and can be used to measure the magnetization of the intrabinary material, and constrain outflow... more velocities and mass-loss rates of the binaries. We propose to observe the 5 brightest eclipsing pulsars (B1718-19, J1723-2837, B1744-24A, B1957+20, J2051-0827), to search for the effects of plasma lensing, and to make use of the new Parkes Ultra Wide Band Low Frequency (UWL) receiver, which will allow us to resolve lensing events in frequency and time, which is crucial for constraining physical parameters. This study will help determine how ubiquitous the effects of plasma lensing are in eclipsing binaries, put improved physical scales on the locations of pulsar emission, and help shed light on the nature of eclipses and evolutionary pathways of these systems. less
Astronomical and Space Sciences not elsewhere classified
01 Apr 2019
30 Sep 2019
compact binaries and/or black-holes
interstellar medium in and around the Milky Way
Creative Commons Attribution 4.0 International Licence
Main, Robert; Wucknitz, Olaf; Antoniadis, John; Lin, Fang Xi; Mahajan, Nikhil (2019): Parkes observations for project P1007 semester 2019APRS_02. v1. CSIRO. Data Collection.
All Rights (including copyright) CSIRO 2019.
Access to this collection's metadata and/or files (if any) are restricted until 30 Mar 2021.
Australia Telescope National Facility
P1007 - An Ultra Wide-Band study of plasma lensing in eclipsing binaries
We are studying "Black Widow" and "Redback" pulsars, namesakes of the spiders which are known to cannibalise their mates. These pulsars have low-mass stars in close orbits around them, which are being drastically heated by the intense radiation from the pulsar, leaving behind a comet-like tail of material. It was recently discovered that the mate... morerial in this tail can act like a magnifying glass to the pulsar, focusing large amounts of radiation to us at Earth (This is the same effect as the bright lines of light at the bottom of a pool, caused by the uneven surface and refraction from the water). We are using this effect to study these pulsars in great detail, distinguishing scales of ~10 km at the pulsar, much finer than can possibly be done with telescopes on Earth. less
Fang Xi Lin