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Low(er) frequency follow-up of 28 candidate, large-scale synchrotron sources

Published online by Cambridge University Press:  20 August 2020

Torrance Hodgson*
Affiliation:
International Centre for Radio Astronomy Research (ICRAR), Curtin University, 1 Turner Ave, Bentley, WA6102, Australia
Melanie Johnston-Hollitt
Affiliation:
International Centre for Radio Astronomy Research (ICRAR), Curtin University, 1 Turner Ave, Bentley, WA6102, Australia
Benjamin McKinley
Affiliation:
International Centre for Radio Astronomy Research (ICRAR), Curtin University, 1 Turner Ave, Bentley, WA6102, Australia ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO3D), Bentley, Australia
Tessa Vernstrom
Affiliation:
CSIRO Astronomy and Space Science, PO Box 1130, BentleyWA6102, Australia
Valentina Vacca
Affiliation:
INAF - Osservatorio Astronomico di Cagliari, Via della Scienza 5, I-09047 Selargius (CA), Italy
*
Author for correspondence: Torrance Hodgson, E-mail: torrance@pravic.xyz

Abstract

We follow up on a report by Vacca et al. (2018) of 28 candidate large-scale diffuse synchrotron sources in an 8° × 8° area of the sky (centred at RA 5h0m0s; Dec 5°48ʹ00ʹʹ). These sources were originally observed at 1.4 GHz using a combination of the single-dish Sardinia Radio Telescope and archival NRAO VLA Sky Survey data. They are in an area with nine massive galaxy clusters at $z \approx 0.1$ and are candidates for the first detection of filaments of the synchrotron cosmic web. We attempt to verify these candidate sources with lower frequency observations at 154 MHz with the Murchison Widefield Array and at 887 MHz with the Australian Square Kilometre Array Pathfinder (ASKAP). We use a novel technique to calculate the surface brightness sensitivity of these instruments to show that our lower frequency observations, and in particular those by ASKAP, are ideally suited to detect large-scale, extended synchrotron emission. Nonetheless, we are forced to conclude that none of these sources are likely to be synchrotron in origin or associated with the cosmic web.

Type
Research Article
Copyright
Copyright © Astronomical Society of Australia 2020; published by Cambridge University Press

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Low(er) frequency follow-up of 28 candidate, large-scale synchrotron sources
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