Language selection

Government of Canada / Gouvernement du Canada

Search

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

From National Research Council Canada

Download
  1. (PDF, 5.3 MiB)
DOIResolve DOI: https://doi.org/10.1093/mnras/stab1858
AuthorSearch for: ORCID identifier: https://orcid.org/0000-0003-2164-5337; Search for: ; Search for: ; Search for: ORCID identifier: https://orcid.org/0000-0003-4873-1681; Search for: ; Search for: 1; Search for: ORCID identifier: https://orcid.org/0000-0002-9994-1593; Search for: ORCID identifier: https://orcid.org/0000-0001-5636-7213; Search for: ORCID identifier: https://orcid.org/0000-0002-2340-8303; Search for: ORCID identifier: https://orcid.org/0000-0003-1749-2542; Search for: ; Search for: ; Search for: ; Search for: ORCID identifier: https://orcid.org/0000-0002-2326-7432; Search for: ORCID identifier: https://orcid.org/0000-0001-5197-1091; Search for: ; Search for: ; Search for: ; Search for: ORCID identifier: https://orcid.org/0000-0003-4351-993X; Search for: ORCID identifier: https://orcid.org/0000-0002-4814-958X; Search for: ; Search for: ORCID identifier: https://orcid.org/0000-0002-0766-7313; Search for: ; Search for: ORCID identifier: https://orcid.org/0000-0001-9033-4140; Search for: ; Search for: ORCID identifier: https://orcid.org/0000-0002-0861-7094; Search for: ; Search for: ; Search for: ORCID identifier: https://orcid.org/0000-0001-5302-1866; Search for: ORCID identifier: https://orcid.org/0000-0002-8057-0294; Search for: ORCID identifier: https://orcid.org/0000-0002-4437-1773
Affiliation
  1. National Research Council of Canada. Herzberg Astronomy and Astrophysics
FunderSearch for: STFC; Search for: National Science Foundation; Search for: University of Minnesota; Search for: COMPETE; Search for: Jet Propulsion Laboratory; Search for: California Institute of Technology; Search for: National Aeronautics and Space Administration
FormatText, Article
Subjectsurveys; planetary nebulae: general; Magellanic Clouds; radio continuum: galaxies; radio continuum: ISM; radio continuum: stars
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.
Publication date
PublisherRoyal Astronomical Society
Oxford University Press
Licence
In
  • Monthly Notices of the Royal Astronomical Society 506, no. 3 (28 July 2021): 3540–3559.
LanguageEnglish
Peer reviewedYes
Export citationExport as RIS
Report a correctionReport a correction (opens in a new tab)
Record identifier79b840f2-6629-4db1-ad65-ecba9635f600
Record created2022-11-04
Record modified2022-11-04
Date modified: