The correlation between far-infrared and non-thermal radio emission at 151 MHz for galaxies: observations and modelling

Cox, M. J.; Steven, Eales,; Alexander, Paul; Fitt, A. J.

doi:10.1093/mnras/235.4.1227

Cited by 30 publications

(23 citation statements)

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“…At 150 MHz, a note worthy feature (Fig.8) is that the slope of the L 150 − L 250 relation is lower than unity (L 250 ∝ L 0.73±0.01 150 ), while the slope is consistent with unity (0.96 ± 0.02) for the L 1.4 of the same galaxies. In terms of the slope of the 150-MHz relationship, our results are similar to those of Cox et al (1988), who found L FIR ∝ L 0.87±0.03 151 , while results of other studies of the correlation at 1.4GHz indicate slopes of unity for this relation for SFGs(e.g. Jarvis et al 2010;Smith et al 2014).…”

Section: The Far-ir/radio Correlation Of Sfgssupporting

confidence: 90%

LOFAR/H-ATLAS: the low-frequency radio luminosity–star formation rate relation

Gürkan

Hardcastle

Smith

et al. 2018

Monthly Notices of the Royal Astronomical Society

154

197

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Radio emission is a key indicator of star formation activity in galaxies, but the radio luminositystar formation relation has to date been studied almost exclusively at frequencies of 1.4 GHz or above. At lower radio frequencies, the effects of thermal radio emission are greatly reduced, and so we would expect the radio emission observed to be completely dominated by synchrotron radiation from supernova-generated cosmic rays. As part of the LOFAR Surveys Key Science project, the Herschel-ATLAS NGP field has been surveyed with LOFAR at an effective frequency of 150 MHz. We select a sample from the MPA-JHU catalogue of Sloan Digital Sky Survey galaxies in this area: the combination of Herschel, optical and mid-infrared data enable us to derive star formation rates (SFRs) for our sources using spectral energy distribution fitting, allowing a detailed study of the low-frequency radio luminosity-star formation relation in the nearby Universe. For those objects selected as star-forming galaxies (SFGs) using optical emission line diagnostics, we find a tight relationship between the 150 MHz radio luminosity (L 150 ) and SFR. Interestingly, we find that a single power-law relationship between L 150 and SFR is not a good description of all SFGs: a broken power-law model provides a better fit. This may indicate an additional mechanism for the generation of radio-emitting cosmic rays. Also, at given SFR, the radio luminosity depends on the stellar mass of the galaxy. Objects that were not classified as SFGs have higher 150-MHz radio luminosity than would be expected given their SFR, implying an important role for low-level active galactic nucleus activity.

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Section: The Far-ir/radio Correlation Of Sfgssupporting

confidence: 90%

LOFAR/H-ATLAS: the low-frequency radio luminosity–star formation rate relation

Gürkan

Hardcastle

Smith

et al. 2018

Monthly Notices of the Royal Astronomical Society

154

197

View full text Add to dashboard Cite

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“…Apart from this, any apparent discrepancy between our value of the slope and that found by previous authors (e.g. Cox et al 1988; Devereux & Eales 1989) could also be due to the fact that (i) we plot 60‐μm luminosity whereas the previous authors used the FIR luminosity and (ii) our SLUGS sample includes higher 60‐μm and FIR luminosities than these previous studies.…”

Section: The Fir–radio Relationship In the Low‐redshift Universecontrasting

confidence: 99%

The far-infrared-radio relationship at high and low redshift

Vlahakis¹,

Eales

Dunne

2007

Monthly Notices of the Royal Astronomical Society

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We use the results of the SCUBA Local Universe Galaxy Survey, a submillimetre (submm) survey of galaxies in the nearby Universe, to investigate the relationship between the far‐infrared (FIR)–submm and radio emission of galaxies at both low and high redshift. At low redshift we show that the correlation between radio and FIR emission is much stronger than the correlation between radio and submm emission, which is evidence that massive stars are the source of both the FIR and radio emission. At high redshift we show that the submm sources detected by SCUBA are brighter sources of radio emission than are predicted from the properties of galaxies in the local Universe. We discuss possible reasons for the cosmic evolution of the relationship between radio and FIR emission.

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“…The simple consequence of this is that at lower luminosities the near‐linear radio‐IR correlation L radio ∝ L γ IR , with γ > 1 (e.g. Cox et al 1988; Price & Duric 1992) will be deviated from. Of course such an assertion is dependent upon the radio emission providing a reliable tracer of star formation at low luminosities which may be equally invalid.…”

Section: Introductionmentioning

confidence: 99%

An evolution of the infrared-radio correlation at very low flux densities?

Beswick

Muxlow

Thrall

et al. 2008

Monthly Notices RAS

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In this paper, we investigate the radio‐mid‐infrared (MIR) correlation at very low flux densities using extremely deep 1.4‐GHz subarcsec angular resolution Multi‐Element Radio‐Linked Interferometer + Very Large Array observations of a field centred upon the Hubble Deep Field‐North, in conjunction with Spitzer 24‐μm data. From these results, the MIR‐radio correlation is extended to the very faint (∼μJy) radio source population. Tentatively, we detect a small deviation from the correlation at the faintest infrared flux densities. We suggest that this small observed change in the gradient of the correlation is the result of a suppression of the MIR emission in faint star‐forming galaxies. This deviation potentially has significant implications for using either the MIR or non‐thermal radio emission as a star formation tracer of very low luminosity galaxies.

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The correlation between far-infrared and non-thermal radio emission at 151 MHz for galaxies: observations and modelling

Cited by 30 publications

References 0 publications

LOFAR/H-ATLAS: the low-frequency radio luminosity–star formation rate relation

LOFAR/H-ATLAS: the low-frequency radio luminosity–star formation rate relation

The far-infrared-radio relationship at high and low redshift

An evolution of the infrared-radio correlation at very low flux densities?

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