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The LOFAR window on star-forming galaxies and AGN - curved radio SEDs and IR-radio correlation at 0 < z < 2.5

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contributor authorRivera, G. Calistro
contributor authorWilliams, W. L.
contributor authorHardcastle, M. J.
contributor authorDuncan, K. J.
contributor authorRöttgering, H.~J.~A.
contributor authorBest, Philip N.
contributor authorBrüggen, Marcus
contributor authorChyzy, K.T.
contributor authorConselice, C. J.
contributor authorDe Gasperin, Francesco
contributor authorEngels, D.
contributor authorGürkan, G.
contributor authorIntema, Huib T.
contributor authorJarvis, M. J.
contributor authorMahony, E. K.
contributor authorMiley, G.K.
contributor authorMorabito, L. K.
contributor authorPrandoni, I.
contributor authorSabater, J.
contributor authorSmith, D. J. B.
contributor authorTasse, C.
contributor authorvan der Werf, P.
contributor authorWhite, Glenn J.
date accessioned2017-08-11T15:06:13Z
date available2017-08-11T15:06:13Z
date issued2017-08-11
identifier citationRivera , G C , Williams , W L , Hardcastle , M J , Duncan , K J , Röttgering , H J A , Best , P N , Brüggen , M , Chyzy , K T , Conselice , C J , De Gasperin , F , Engels , D , Gürkan , G , Intema , H T , Jarvis , M J , Mahony , E K , Miley , G K , Morabito , L K , Prandoni , I , Sabater , J , Smith , D J B , Tasse , C , van der Werf , P & White , G J 2017 , ' The LOFAR window on star-forming galaxies and AGN - curved radio SEDs and IR-radio correlation at 0 < z < 2.5 ' Monthly Notices of the Royal Astronomical Society , vol 469 , no. 3 , stx1040 , pp. 3468-3488 . DOI: 10.1093/mnras/stx1040en
identifier issn0035-8711
identifier otherPURE: 11842056
identifier otherPURE UUID: 747b5ec9-e51e-4753-a750-487a784c8296
identifier otherArXiv: http://arxiv.org/abs/1704.06268v1
identifier urihttp://hdl.handle.net/2299/19222
descriptionThis article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. ©: 2017 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.en
description abstractWe present a study of the low-frequency radio properties of star forming (SF) galaxies and active galactic nuclei (AGN) up to redshift $z=2.5$. The new spectral window probed by the Low Frequency Array (LOFAR) allows us to reconstruct the radio continuum emission from 150 MHz to 1.4 GHz to an unprecedented depth for a radio-selected sample of $1542$ galaxies in $\sim 7~ \rm{deg}^2$ of the LOFAR Bo\"otes field. Using the extensive multi-wavelength dataset available in Bo\"otes and detailed modelling of the FIR to UV spectral energy distribution (SED), we are able to separate the star-formation (N=758) and the AGN (N=784) dominated populations. We study the shape of the radio SEDs and their evolution across cosmic time and find significant differences in the spectral curvature between the SF galaxy and AGN populations. While the radio spectra of SF galaxies exhibit a weak but statistically significant flattening, AGN SEDs show a clear trend to become steeper towards lower frequencies. No evolution of the spectral curvature as a function of redshift is found for SF galaxies or AGN. We investigate the redshift evolution of the infrared-radio correlation (IRC) for SF galaxies and find that the ratio of total infrared to 1.4 GHz radio luminosities decreases with increasing redshift: $ q_{\rm 1.4GHz} = (2.45 \pm 0.04) \times (1+z)^{-0.15 \pm 0.03} $. Similarly, $q_{\rm 150MHz}$ shows a redshift evolution following $ q_{\rm 150GHz} = (1.72 \pm 0.04) \times (1+z)^{-0.22 \pm 0.05}$. Calibration of the 150 MHz radio luminosity as a star formation rate tracer suggests that a single power-law extrapolation from $q_{\rm 1.4GHz}$ is not an accurate approximation at all redshifts.en
format extent21en
language isoeng
relation ispartofMonthly Notices of the Royal Astronomical Societyen
rightsen
subjectgalaxies: evolutionen
subjectgalaxies: nucleien
subjectgalaxies: photometryen
subjectgalaxies: starbursten
subjectinfrared: galaxiesen
subjectradio continuum: galaxiesen
titleThe LOFAR window on star-forming galaxies and AGN - curved radio SEDs and IR-radio correlation at 0 < z < 2.5en
typeArticleen
contributor institutionSchool of Physics, Astronomy and Mathematicsen
contributor institutionCentre for Astrophysics Researchen
identifier doihttp://dx.doi.org/10.1093/mnras/stx1040
description versionpublishersversionen
description statusPeer revieweden


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