J/other/PASA/38.41 GLEAM 200MHz local radio luminosity function (Franzen+, 2021)
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Beginning of ReadMe : J/other/PASA/38.41 GLEAM 200MHz local radio luminosity function (Franzen+, 2021) ================================================================================ The GLEAM 200-MHz local radio luminosity function for AGN and star-forming galaxies. Franzen T.M.O., Seymour N., Sadler E.M., Mauch T., White S.V., Jackson C.A., Chhetri R., Quici B., Bell M.E., Callingham J.R., Dwarakanath K.S., For B., Gaensler B.M., Hancock P.J., Hindson L., Hurley-Walker N., Johnston-Hollitt M., Kapinska A.D., Lenc E., McKinley B., Morgan J., Offringa A.R., Procopio P., Staveley-Smith L., Wayth R.B., Wu C., Zheng Q. <Publ. Astron. Soc. Australia PASA, 38, 41 (2021)> =2021PASA...38...41F (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Active gal. nuclei ; Galaxies, nearby ; Galaxies, radio ; Radio continuum ; Radio sources Keywords: radio continuum: galaxies - surveys - methods: data analysis - catalogues - galaxies: active - galaxies: starburst Abstract: The GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) is a radio continuum survey at 76-227MHz of the entire southern sky (Declination <+30deg) with an angular resolution of  2arcmin. In this paper, we combine GLEAM data with optical spectroscopy from the 6dF Galaxy Survey to construct a sample of 1,590 local (median z 0.064) radio sources with S_200MHz_>55mJy across an area of  16700deg^2^. From the optical spectra, we identify the dominant physical process responsible for the radio emission from each galaxy: 73 per cent are fuelled by an active galactic nucleus (AGN) and 27 per cent by star formation. We present the local radio luminosity function for AGN and star-forming galaxies at 200MHz and characterise the typical radio spectra of these two populations between 76MHz and  1GHz. For the AGN, the median spectral index between 200MHz and  1GHz, alpha, is -0.600+/-0.010 (where S proportional to nu^alpha^) and the median spectral index within the GLEAM band, alpha_low_, is -0.704+/-0.011. For the star-forming galaxies, the median value of alpha_high_ is -0.650+/-0.010 and the median value of alpha_low_ is -0.596+/-0.015. Among the AGN population, flat-spectrum sources are more common at lower radio luminosity, suggesting the existence of a significant population of weak radio AGN that remain core-dominated even at low frequencies. However, around 4 per cent of local radio AGN have ultra-steep radio spectra at low frequencies (alpha_low_<-1.2). These ultra-steep-spectrum sources span a wide range in radio luminosity, and further work is needed to clarify their nature. Description: We have studied the local radio source population at 200MHz over most of the southern sky (16679deg^2^) by combining the GLEAM Exgal and SGP data with optical spectroscopy from the 6dFGS DR3. The GLEAM-6dFGS sample contains 1590 sources with a median redshift of 0.064 and 200MHz radio luminosities in the range  10^22^-10^27^W/Hz. The optical spectra indicate that 73 per cent of the sources are fuelled by AGN activity and 27 per cent by star formation. The vast majority (81 per cent) of the AGN have pure absorption-line spectra typical of giant elliptical galaxies. The AGN with emission-line spectra typically have lower luminosities and overlap in luminosity with the SF galaxies.

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