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The ASKAP-EMU Early Science Project: 888 MHz radio continuum survey of the Large Magellanic Cloud

Pennock, Clara M; Van Loon, Jacco Th; Filipović, Miroslav D; Andernach, Heinz; Haberl, Frank; Kothes, Roland; Lenc, Emil; Rudnick, Lawrence; White, Sarah V; Agliozzo, Claudia; Antón, Sonia; Bojičić, Ivan; Bomans, Dominik J; Collier, Jordan D; Crawford, Evan J; Hopkins, Andrew M; Jeganathan, Kanapathippillai; Kavanagh, Patrick J; Koribalski, Bärbel S; Leahy, Denis; Maggi, Pierre; Maitra, Chandreyee; Marvil, Josh; Michałowski, Michał J; Norris, Ray P; Oliveira, Joana M; Payne, Jeffrey L; Sano, Hidetoshi; Sasaki, Manami; Staveley-Smith, Lister; Vardoulaki, Eleni

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Authors

Clara M Pennock

Miroslav D Filipović

Heinz Andernach

Frank Haberl

Roland Kothes

Emil Lenc

Lawrence Rudnick

Sarah V White

Claudia Agliozzo

Sonia Antón

Ivan Bojičić

Dominik J Bomans

Jordan D Collier

Evan J Crawford

Andrew M Hopkins

Kanapathippillai Jeganathan

Patrick J Kavanagh

Bärbel S Koribalski

Denis Leahy

Pierre Maggi

Chandreyee Maitra

Josh Marvil

Michał J Michałowski

Ray P Norris

Jeffrey L Payne

Hidetoshi Sano

Manami Sasaki

Lister Staveley-Smith

Eleni Vardoulaki



Abstract

We present an analysis of a new 120 deg2 radio continuum image of the Large Magellanic Cloud (LMC) at 888 MHz with a bandwidth of 288 MHz and beam size of 13${_{.}^{\prime\prime}}$9 × 12${_{.}^{\prime\prime}}$1 from the Australian Square Kilometre Array Pathfinder processed as part of the Evolutionary Map of the Universe survey. The median root mean squared noise is 58 $\mu$Jy beam-1. We present a catalogue of 54?612 sources, divided over a Gold list (30?866 sources) complete down to 0.5 mJy uniformly across the field, a Silver list (22?080 sources) reaching down to <0.2 mJy, and a Bronze list (1666 sources) of visually inspected sources in areas of high noise and/or near bright complex emission. We discuss detections of planetary nebulae and their radio luminosity function, young stellar objects showing a correlation between radio luminosity and gas temperature, novae and X-ray binaries in the LMC, and active stars in the Galactic foreground that may become a significant population below this flux level. We present examples of diffuse emission in the LMC (H?ii regions, supernova remnants, bubbles) and distant galaxies showcasing spectacular interaction between jets and intracluster medium. Among 14?333 infrared counterparts of the predominantly background radio source population, we find that star-forming galaxies become more prominent below 3 mJy compared to active galactic nuclei. We combine the new 888 MHz data with archival Australia Telescope Compact Array data at 1.4 GHz to determine spectral indices; the vast majority display synchrotron emission but flatter spectra occur too. We argue that the most extreme spectral index values are due to variability.

Acceptance Date Jun 22, 2021
Online Publication Date Jul 2, 2021
Publication Date 2021-09
Publicly Available Date May 30, 2023
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 506
Issue 3
Pages 3540 - 3559
DOI https://doi.org/10.1093/mnras/stab1858
Keywords surveys, planetary nebulae: general, Magellanic Clouds, radio continuum: galaxies, radio continuum: ISM, radio continuum: stars
Publisher URL https://doi.org/10.1093/mnras/stab1858

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