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

Pennock, C. M., van Loon, J. T., Filipovic, M. D., Andernach, H., Haberl, F., Kothes, R., et al. (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. doi:10.1093/mnras/stab1858.

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Pennock, Clara M., Author
van Loon, Jacco Th., Author
Filipovic, Miroslav D., Author
Andernach, Heinz, Author
Haberl, Frank1, Author              
Kothes, Roland, Author
Lenc, Emil, Author
Rudnick, Lawrence, Author
White, Sarah V., Author
Agliozzo, Claudia, Author
Anton, Sonia, Author
Bojicic, Ivan, Author
Bomans, Dominik J., Author
Collier, Jordan D., Author
Crawford, Evan J., Author
Hopkins, Andrew M., Author
Jeganathan, Kanapathippillai, Author
Kavanagh, Patrick J., Author
Koribalski, Barbel S., Author
Leahy, Denis, Author
Maggi, Pierre, AuthorMaitra, Chandreyee1, Author              Marvil, Josh, AuthorMichałowski, Michał J., AuthorNorris, Ray P., AuthorOliveira, Joana M., AuthorPayne, Jeffrey L., AuthorSano, Hidetoshi, AuthorSasaki, Manami, AuthorStaveley-Smith, Lister, AuthorVardoulaki, Eleni, Author more..
Affiliations:
1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 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.

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Language(s): eng - English
 Dates: 2021-07-02
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/stab1858
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Title: Monthly Notices of the Royal Astronomical Society
  Abbreviation : Mon. Not. Roy. Astron. Soc.
Source Genre: Journal
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Pages: - Volume / Issue: 506 (3) Sequence Number: - Start / End Page: 3540 - 3559 Identifier: ISSN: 0035-8711
ISSN: 1365-8711