Radio continuum sources behind the Large Magellanic Cloud

Filipovic MD, Bojicic IS, Grieve KR, Norris RP, Tothill NFH, Shobhana D, Rudnick L, Prandoni I, Andernach H, Hurley-Walker N, Alsaberi RZE, Anderson CS, Collier JD, Crawford EJ, For BQ, Galvin TJ, Haberl F, Hopkins AM, Ingallinera A, Kavanagh PJ, Koribalski BS, Kothes R, Leahy D, Leverenz H, Maggi P, Maitra C, Marvil J, Pannuti TG, Park LAF, Payne JL, Pennock CM, Riggi S, Rowell G, Sano H, Sasaki M, Staveley-Smith L, Trigilio C, Umana G, Urosevic D, Van Loon JT, Vardoulaki E (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Book Volume: 507

Pages Range: 2885-2904

Journal Issue: 2

DOI: 10.1093/mnras/stab2249

Abstract

We present a comprehensive multifrequency catalogue of radio sources behind the Large Magellanic Cloud (LMC) between 0.2 and 20 GHz, gathered from a combination of new and legacy radio continuum surveys. This catalogue covers an area of similar to 144 deg(2) at angular resolutions from 45 arcsec to similar to 3 arcmin. We find 6434 discrete radio sources in total, of which 3789 are detected at two or more radio frequencies. We estimate the median spectral index (alpha; where S-v similar to nu(alpha)) of alpha = -0.89 and mean of -0.88 +/- 0.48 for 3636 sources detected exclusively at two frequencies (0.843 and 1.384 GHz) with similar resolution [full width at half-maximum (FWHM) similar to 40-45 arcsec]. The large frequency range of the surveys makes it an effective tool to investigate Gigahertz Peak Spectrum (GPS), Compact Steep Spectrum (CSS), and Infrared Faint Radio Source (IFRS) populations within our sample. We find 10 GPS candidates with peak frequencies near 5 GHz, from which we estimate their linear size. 1866 sources from our catalogue are CSS candidates with alpha < -0.8. We found six candidates for High Frequency Peaker (HFP) sources, whose radio fluxes peak above 5 GHz and no sources with unconstrained peaks and alpha > 0.5. We found optical counterparts for 343 of the radio continuum sources, of which 128 have a redshift measurement. Finally, we investigate the population of 123 IFRSs found in this study.

Authors with CRIS profile

Involved external institutions

University of Adelaide Australia (AU) National Radio Astronomy Observatory (NRAO) United States (USA) (US) National Institute for Astrophysics / Istituto Nazionale Astrofisica (INAF) Italy (IT) University of Keele United Kingdom (GB) Osservatorio Astrofisico di Catania Italy (IT) University of Western Sydney Australia (AU) University of Belgrade / Универзитет у Београду Serbia (RS) Commonwealth Scientific and Industrial Research Organisation (CSIRO) Australia (AU) University of Cape Town (UCT) South Africa (ZA) Thüringer Landessternwarte Tautenburg (TLS) - Karl-Schwarzschild-Observatorium Germany (DE) University of Minnesota (UMN) United States (USA) (US) Morehead State University United States (USA) (US) Curtin University Australia (AU) Université de Strasbourg (UDS) France (FR) National Research Council / Conseil national de recherches Canada Canada (CA) Max-Planck-Institut für extraterrestrische Physik (MPE) / Max Planck Institute for Extraterrestrial Physics Germany (DE) Australian Respiratory Council (ARC) Australia (AU) Dublin Institute for Advanced Studies (DIAS) Ireland (IE) University of Calgary Canada (CA) National Astronomical Observatory of Japan / 国立天文台(NAOJ) Japan (JP) Universidad de Guanajuato (UG) Mexico (MX)

How to cite

APA:

Filipovic, M.D., Bojicic, I.S., Grieve, K.R., Norris, R.P., Tothill, N.F.H., Shobhana, D.,... Vardoulaki, E. (2021). Radio continuum sources behind the Large Magellanic Cloud. Monthly Notices of the Royal Astronomical Society, 507(2), 2885-2904. https://dx.doi.org/10.1093/mnras/stab2249

MLA:

Filipovic, M. D., et al. "Radio continuum sources behind the Large Magellanic Cloud." Monthly Notices of the Royal Astronomical Society 507.2 (2021): 2885-2904.

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