An ALMA survey of submillimetre galaxies in the Extended Chandra Deep Field South: radio properties and the far-infrared/radio correlation

Abstract

We present a study of the radio properties of 870$\mu$m-selected submillimetre galaxies (SMGs), observed at high resolution with ALMA in the Extended Chandra Deep Field South. From our initial sample of 76 ALMA SMGs, we detect 52 SMGs at $>3\sigma$ significance in VLA 1400MHz imaging, of which 35 are also detected at $>3\sigma$ in new 610MHz GMRT imaging. Within this sample of radio-detected SMGs, we measure a median radio spectral index ${\alpha }_{610}^{1400}=-0.79\pm 0.06$, (with inter-quartile range $\alpha =[-1.16,-0.56]$) and investigate the far-infrared/radio correlation via the parameter $q_{\mathrm{IR}}$, the logarithmic ratio of the rest-frame 8-1000$\mu$m flux and monochromatic radio flux. Our median $q_{\mathrm{IR}}=2.56\pm 0.05$ (inter-quartile range $q_{\mathrm{IR}}=[2.42,2.78]$) is higher than that typically seen in single-dish 870$\mu$m-selected sources ($q_{\mathrm{IR}}\sim 2.4$), which may reflect the fact that our ALMA-based study is not biased to radio-bright counterparts, as previous samples were. Finally, we search for evidence that $q_{\mathrm{IR}}$ and $\alpha$ evolve with age in a co-dependent manner, as predicted by starburst models: the data populate the predicted region of parameter space, with the stellar mass tending to increase along tracks of $q_{\mathrm{IR}}$ versus $\alpha$ in the direction expected, providing the first observational evidence in support of these models.

13 pages, 4 figures, 3 colour figures, Accepted by MNRAS

References in corpus (7)

• Mid-Infrared Spectral Diagnosis of Submillimeter Galaxies
• An ALMA survey of submillimetre galaxies in the Extended Chandra Deep Field South: High resolution 870um source counts
• Exploring the infrared/radio correlation at high redshift
• On the origin of radio core emission in radio-quiet quasars
• Extending the infrared radio correlation
• A new search for distant radio galaxies in the Southern hemisphere -- III. Optical spectroscopy and analysis of the MRCR--SUMSS sample
• Probing the nature of compact ultra-steep spectrum radio sources with the e-EVN and e-MERLIN

Cited by in corpus (37)

• An ALMA survey of Sub-millimeter Galaxies in the Extended Chandra Deep Field South: Physical properties derived from ultraviolet-to-radio modelling
• High-redshift star formation in the ALMA era
• The far-infrared/radio correlation and radio spectral index of galaxies in the SFR-M* plane up to z 2
• Physical properties of z>4 submillimeter galaxies in the COSMOS field
• A Multi-wavelength Analysis of the Faint Radio Sky (COSMOS-XS): the Nature of the Ultra-faint Radio Population
• Radio spectral properties of star-forming galaxies in the MIGHTEE-COSMOS field and their impact on the far-infrared-radio correlation
• (Sub)millimetre interferometric imaging of a sample of COSMOS/AzTEC submillimetre galaxies - I. Multiwavelength identifications and redshift distribution
• The e-MERLIN Galaxy Evolution Survey (e-MERGE): Overview and Survey Description
• SCUBA-2 Ultra Deep Imaging Eao Survey (Studies) III: Multi-wavelength properties, luminosity functions and preliminary source catalog of 450-$\mu$m-selected galaxies
• Close-up view of a luminous star-forming galaxy at z=2.95
• Cosmic evolution of star-forming galaxies to $z\simeq 1.8$ in the faint low-frequency radio source population
• Tracing cool molecular gas and star formation on $\sim 100$pc scales within a $z=2.3$ galaxy
• An ALMA Survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: The Far-infrared/Radio correlation for High-redshift Dusty Star-forming Galaxies
• Multi-wavelength properties of radio and machine-learning identified counterparts to submillimeter sources in S2COSMOS
• Compact Star-Forming Galaxies as Old Starbursts Becoming Quiescent
• Unveiling the nature of 11 dusty star-forming galaxies at the peak of cosmic star formation history
• (Sub)millimetre interferometric imaging of a sample of COSMOS/AzTEC submillimetre galaxies IV. Physical properties derived from spectral energy distributions
• A Submillimeter Perspective on the GOODS Fields (SUPER GOODS). V. Deep 450 Micron Imaging
• Cold Molecular Gas and Free-Free Emission from Hot, Dust-Obscured Galaxies at $z$~3
• An ALMA view of 11 Dusty Star Forming Galaxies at the peak of Cosmic Star Formation History
• Nowhere to Hide: Radio-faint AGN in the GOODS-N field. II. Multi-wavelength AGN selection techniques and host galaxy properties
• Resolved CO(1-0) emission and gas properties in luminous dusty star forming galaxies at z=2-4
• Illuminating the Dark Side of Cosmic Star Formation III: Building the largest homogeneous sample of Radio-Selected Dusty Star-Forming Galaxies in COSMOS with PhoEBO
• A Submillimeter Perspective on the GOODS Fields (SUPER GOODS) - II. The High Radio Power Population in the GOODS-N
• The growth of typical star-forming galaxies and their super massive black holes across cosmic time since z~2
• COLDz: Probing Cosmic Star Formation With Radio Free-free Emission
• Deciphering the radio star formation correlation on kpc scales II. The integrated infrared-radio continuum and star formation - radio continuum correlations
• Deep uGMRT observations of the ELAIS-North 1 field: statistical properties of radio--infrared relations up to $z\sim$2
• SPARCS-North Wide-field VLBI Survey: Exploring the resolved MicroJy extra-galactic radio source population with EVN+e-MERLIN
• Connecting MeerKAT radio continuum properties to GAMA optical emission-line and WISE mid-infrared activity
• The far-infrared/radio correlation for a sample of strongly lensed dusty star-forming galaxies detected by Herschel
• Searching for obscured AGN in z $\sim$ 2 submillimetre galaxies
• Cosmic evolution of molecular gas mass density from an empirical relation between ${\mathrm{L}}_{1.4GHz}$ and ${\mathrm{L}}_{\mathrm{CO}}^{\prime }$
• The ALPINE-ALMA [CII] survey: The infrared-radio correlation and AGN fraction of star-forming galaxies at z $\sim$ 4.4-5.9
• The Interplay between SF and AGN Activity, and its role in Galaxy Evolution
• MeerKAT radio continuum imaging of nearby star-forming spirals in the NGC 6221, NGC 3256/3263, and NGC 2434 galaxy groups
• The evolution of extragalactic peaked-spectrum sources down to 54 megahertz