Probing Pulsar Scattering between 120 and 280 MHz with the MWA
Artikel i vetenskaplig tidskrift, 2019

The high sensitivity and wide frequency coverage of the Murchison Widefield Array allow for the measurement of the spectral scaling of the pulsar scattering timescale, α, from a single observation. Here we present three case studies targeted at bright, strongly scattered pulsars J0534+2200 (the Crab pulsar), J0835-4510 (the Vela pulsar), and J0742-2822. We measure the scattering spectral indices to be -3.8 ±0.2, -4.0 ±1.5, and -2.5 ±0.6 for the Crab, Vela, and J0742-2822, respectively. We find that the scattered profiles of both Vela and J0742-2822 are best described by a thin screen model where the Gum Nebula likely contributes most of the observed scattering delay. For the Crab pulsar we see characteristically different pulse shapes compared to higher frequencies, for which none of the scattering screen models we explore are found to be optimal. The presence of a finite inner scale to the turbulence can possibly explain some of the discrepancies.

scattering

pulsars: general

ISM: structure

pulsars: individual (PSRs J0534+2200, J0742-2822, J0835-4510)

Författare

Franz Kirsten

Curtin University

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Galaktisk astrofysik

N. D.R. Bhat

Curtin University

B. W. Meyers

Curtin University

Commonwealth Scientific and Industrial Research Organisation (CSIRO)

J. P. Macquart

Curtin University

S. E. Tremblay

Curtin University

S. M. Ord

Commonwealth Scientific and Industrial Research Organisation (CSIRO)

Astrophysical Journal

0004-637X (ISSN) 1538-4357 (eISSN)

Vol. 874 2 179

Ämneskategorier

Astronomi, astrofysik och kosmologi

DOI

10.3847/1538-4357/ab0c05

Mer information

Senast uppdaterat

2019-11-14