LOFAR 150-MHz observations of the Boötes field: catalogue and source counts

Williams, W. L.; Weeren, R. J. van; Röttgering, H. J. A.; Best, P. N.; Dijkema, T. J.; Gasperin, F. de; Hardcastle, M. J.; Heald, G.; Prandoni, I.; Sabater, J.; Shimwell, T. W.; Tasse, C.; Bemmel, I. M. van; Brüggen, M.; Brunetti, G.; Conway, J.; Enßlin, T. A.; Engels, D.; Falcke, H.; Ferrari, C.; Haverkorn, M.; Jackson, N.; Jarvis, Matt J.; Kapińska, A. D.; Mahony, E. K.; Miley, G. K.; Morabito, L. K.; Morganti, R.; Orrù, E.; Retana-Montenegro, E.; Sridhar, S. S.; Toribio, M. C.; White, G. J.; Wise, Michael; Zwart, Jonathan T. L.

doi:10.1093/mnras/stw1056

Cited by 206 publications

(154 citation statements)

References 69 publications

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“…(8). Our estimate of the total counts agree very well with the data from Williams et al (2016), Hardcastle et al (2016), Mahony et al (2016) and Hurley-Walker et al (2017;see also Franzen et al 2016). We stress that present data probe the counts down to S 150 MHz 1 mJy, where they are mostly contributed by lowredshift z 1, steep-spectrum RL AGNs.…”

Section: Resultssupporting

confidence: 90%

Galaxy Evolution in the Radio Band: The Role of Star-forming Galaxies and Active Galactic Nuclei

Mancuso

Lapi

Prandoni

et al. 2017

ApJ

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106

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We investigate the astrophysics of radio-emitting star-forming galaxies and active galactic nuclei (AGNs), and elucidate their statistical properties in the radio band including luminosity functions, redshift distributions, and number counts at sub-mJy flux levels, that will be crucially probed by next-generation radio continuum surveys. Specifically, we exploit the model-independent approach by Mancuso et al. (2016a,b) to compute the star formation rate functions, the AGN duty cycles and the conditional probability of a star-forming galaxy to host an AGN with given bolometric luminosity. Coupling these ingredients with the radio emission properties associated to star formation and nuclear activity, we compute relevant statistics at different radio frequencies, and disentangle the relative contribution of star-forming galaxies and AGNs in different radio luminosity, radio flux, and redshift ranges. Finally, we highlight that radio-emitting star-forming galaxies and AGNs are expected to host supermassive black holes accreting with different Eddington ratio distributions, and to occupy different loci in the galaxy main sequence diagrams. These specific predictions are consistent with current datasets, but need to be tested with larger statistics via future radio data with multi-band coverage on wide areas, as it will become routinely achievable with the advent of the SKA and its precursors.

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Section: Resultssupporting

confidence: 90%

Galaxy Evolution in the Radio Band: The Role of Star-forming Galaxies and Active Galactic Nuclei

Mancuso

Lapi

Prandoni

et al. 2017

ApJ

Self Cite

106

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“…the breakdown of the luminosity function into FRI/II and LERG/HERG classes) are known to evolve with redshift (e.g. Williams et al 2016;Best et al 2014), such systematic effects mean that a Q jet -L R relation derived for local FRIs may lead to systematically incorrect results if extrapolated to high redshift jet populations.…”

Section: Implications For Jet Power Relationsmentioning

confidence: 99%

Particle content, radio-galaxy morphology, and jet power: all radio-loud AGN are not equal

Croston

Ineson

Hardcastle

2018

Monthly Notices of the Royal Astronomical Society

127

118

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Ongoing and future radio surveys aim to trace the evolution of black hole growth and feedback from active galactic nuclei (AGN) throughout cosmic time; however, there remain major uncertainties in translating radio luminosity functions into a reliable assessment of the energy input as a function of galaxy and/or dark matter halo mass. A crucial and long-standing problem is the composition of the radio-lobe plasma that traces AGN jet activity. In this paper, we carry out a systematic comparison of the plasma conditions in Fanaroff & Riley class I and II radio galaxies to demonstrate conclusively that their internal composition is systematically different. This difference is best explained by the presence of an energetically dominant proton population in the FRI, but not the FRII radio galaxies. We show that, as expected from this systematic difference in particle content, radio morphology also affects the jet-power/radioluminosity relationship, with FRII radio galaxies having a significantly lower ratio of jet power to radio luminosity than the FRI cluster radio sources used to derive jet-power scaling relations via X-ray cavity measurements. Finally we also demonstrate conclusively that lobe composition is unconnected to accretion mode (optical excitation class): the internal conditions of low-and high-excitation FRII radio lobes are indistinguishable. We conclude that inferences of population-wide AGN impact require careful assessment of the contribution of different jet sub-classes, particularly given the increased diversity of jet evolutionary states expected to be present in deep, low-frequency radio surveys such as the LOFAR Two-Metre Sky Survey.

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“…Our focus is on monochromatic SFR indicators, in part due to the data we currently have available and in part because such calibrations will be readily usable by new deep wide-field surveys (e.g., Norris et al 2011;Williams et al 2016). The calibrations utilize the photometry and SEDs of Brown et al (2014b), and new photometry of galaxies with distances of 10 Mpc.…”

Section: Introductionmentioning

confidence: 99%

Calibration of Ultraviolet, Mid-infrared, and Radio Star Formation Rate Indicators

Brown

Moustakas

Kennicutt

et al. 2017

ApJ

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We present calibrations for star formation rate (SFR) indicators in the ultraviolet, mid-infrared, and radiocontinuum bands, including one of the first direct calibrations of 150 MHz as an SFR indicator. Our calibrations utilize 66 nearby star-forming galaxies with Balmer-decrement-corrected Ha luminosities, which span five orders of magnitude in SFR and have absolute magnitudes of M 24 12 r -< < -. Most of our photometry and spectrophotometry are measured from the same region of each galaxy, and our spectrophotometry has been validated with SDSS photometry, so our random and systematic errors are small relative to the intrinsic scatter seen in SFR indicator calibrations. We find that the Wide-field Infrared Space Explorer W4 (22.8 μm), Spitzer24 μm, and 1.4 GHz bands have tight correlations with the Balmer-decrement-corrected Hα luminosity, with a scatter of only 0.2dex. Our calibrations are comparable to those from the prior literature for L * galaxies, but for dwarf galaxies, our calibrations can give SFRs that are far greater than those derived from most previous literature.

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LOFAR 150-MHz observations of the Boötes field: catalogue and source counts

Cited by 206 publications

References 69 publications

Galaxy Evolution in the Radio Band: The Role of Star-forming Galaxies and Active Galactic Nuclei

Galaxy Evolution in the Radio Band: The Role of Star-forming Galaxies and Active Galactic Nuclei

Particle content, radio-galaxy morphology, and jet power: all radio-loud AGN are not equal

Calibration of Ultraviolet, Mid-infrared, and Radio Star Formation Rate Indicators

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