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

Pennock CM, Van Loon JT, Filipović MD, Andernach H, Haberl F, Kothes R, Lenc E, Rudnick L, White SV, Agliozzo C, Antón S, Bojičić I, Bomans DJ, Collier JD, Crawford EJ, Hopkins AM, Jeganathan K, Kavanagh PJ, Koribalski BS, Leahy D, Maggi P, Maitra C, Marvil J, Michałowski MJ, Norris RP, Oliveira JM, Payne JL, Sano H, Sasaki M, Staveley-Smith L, Vardoulaki E (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Book Volume: 506

Pages Range: 3540-3559

Journal Issue: 3

DOI: 10.1093/mnras/stab1858

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".9 × 12".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 μJy 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.

Authors with CRIS profile

Involved external institutions

University of Keele United Kingdom (GB) University of Western Sydney Australia (AU) Universidad de Guanajuato (UG) Mexico (MX) Max-Planck-Institut für extraterrestrische Physik (MPE) / Max Planck Institute for Extraterrestrial Physics Germany (DE) National Research Council / Conseil national de recherches Canada Canada (CA) Australia Telescope National Facility (ATNF) Australia (AU) University of Minnesota (UMN) United States (USA) (US) Rhodes University South Africa (ZA) European Southern Observatory (ESO) Germany (DE) Center for Research & Development in Mathematics and Applications / Centro de Investigação e Desenvolvimento em Matemática e Aplicações (CIDMA) Portugal (PT) Ruhr-Universität Bochum (RUB) Germany (DE) Macquarie University Australia (AU) Commonwealth Scientific and Industrial Research Organisation (CSIRO) Australia (AU) Dublin Institute for Advanced Studies (DIAS) Ireland (IE) University of Calgary Canada (CA) Université de Strasbourg (UDS) France (FR) National Radio Astronomy Observatory United States (USA) (US) National Astronomical Observatory of Japan / 国立天文台(NAOJ) Japan (JP) University of Western Australia (UWA) Australia (AU) Thüringer Landessternwarte Tautenburg (TLS) - Karl-Schwarzschild-Observatorium Germany (DE)

How to cite

APA:

Pennock, C.M., Van Loon, J.T., Filipović, M.D., Andernach, H., Haberl, F., Kothes, R.,... Vardoulaki, E. (2021). The ASKAP-EMU Early Science Project: 888 MHz radio continuum survey of the Large Magellanic Cloud. Monthly Notices of the Royal Astronomical Society, 506(3), 3540-3559. https://dx.doi.org/10.1093/mnras/stab1858

MLA:

Pennock, Clara M., et al. "The ASKAP-EMU Early Science Project: 888 MHz radio continuum survey of the Large Magellanic Cloud." Monthly Notices of the Royal Astronomical Society 506.3 (2021): 3540-3559.

BibTeX: Download