MIGHTEE: Deep 1.4 GHz Source Counts and the Sky Temperature Contribution of Star Forming Galaxies and Active Galactic Nuclei

Abstract

We present deep 1.4 GHz source counts from $\sim$5 deg${}^2$ of the continuum Early Science data release of the MeerKAT International Gigahertz Tiered Extragalactic Exploration (MIGHTEE) survey down to $S_{1.4\text{GHz}}\sim$15 $\mu$Jy. Using observations over two extragalactic fields (COSMOS and XMM-LSS), we provide a comprehensive investigation into correcting the incompleteness of the raw source counts within the survey to understand the true underlying source count population. We use a variety of simulations that account for: errors in source detection and characterisation, clustering, and variations in the assumed source model used to simulate sources within the field and characterise source count incompleteness. We present these deep source count distributions and use them to investigate the contribution of extragalactic sources to the sky background temperature at 1.4 GHz using a relatively large sky area. We then use the wealth of ancillary data covering{a subset of the COSMOS field to investigate the specific contributions from both active galactic nuclei (AGN) and star forming galaxies (SFGs) to the source counts and sky background temperature. We find, similar to previous deep studies, that we are unable to reconcile the sky temperature observed by the ARCADE 2 experiment. We show that AGN provide the majority contribution to the sky temperature contribution from radio sources, but the relative contribution of SFGs rises sharply below 1 mJy, reaching an approximate 15-25% contribution to the total sky background temperature ($T_b\sim$100 mK) at $\sim$15 $\mu$Jy.

arXiv comment24 pages, 12 figures; Accepted for publication in MNRAS

References in corpus (105)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Array Programming with NumPy
• Astropy: A Community Python Package for Astronomy
• emcee: The MCMC Hammer
• The NumPy array: a structure for efficient numerical computation
• Planck 2015 results. XIII. Cosmological parameters
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• LOFAR: The LOw-Frequency ARray
• Halo Models of Large Scale Structure
• The Co-Evolution of Galaxies and Supermassive Black Holes: Insights from Surveys of the Contemporary Universe
• The COSMOS2015 Catalog: Exploring the 1<z<6 Universe with half a million galaxies
• Simba: Cosmological Simulations with Black Hole Growth and Feedback
• WSClean: an implementation of a fast, generic wide-field imager for radio astronomy
• The GMRT 150 MHz All-sky Radio Survey: First Alternative Data Release TGSS ADR1
• UltraVISTA: a new ultra-deep near-infrared survey in COSMOS
• Estimating Star Formation Rates from Infrared and Radio Luminosities: The Origin of the Radio-Infrared Correlation
• The Herschel Multi-tiered Extragalactic Survey: HerMES
• SWIRE: The SIRTF Wide-area InfraRed Extragalactic Survey
• On the fundamental dichotomy in the local radio-AGN population: accretion, evolution, and host galaxy properties
• Identifying Luminous AGN in Deep Surveys: Revised IRAC Selection Criteria
• First Data Release of the Hyper Suprime-Cam Subaru Strategic Program
• The LOFAR Two-metre Sky Survey - II. First data release
• The LOFAR Two-metre Sky Survey -- V. Second data release
• Science with ASKAP - the Australian Square Kilometre Array Pathfinder
• The VLA-COSMOS 3 GHz Large Project: Continuum data and source catalog release
• Radio sources in the 6dFGS: Local luminosity functions at 1.4 GHz for star-forming galaxies and radio-loud AGN
• The XMM-Newton wide-field survey in the COSMOS field: I. Survey description
• The VISTA Deep Extragalactic Observations (VIDEO) Survey
• A semi-empirical simulation of the extragalactic radio continuum sky for next generation radio telescopes
• ARCADE 2 Measurement of the Extra-Galactic Sky Temperature at 3-90 GHz
• On Departures From a Power Law in the Galaxy Correlation Function
• Australian Square Kilometre Array Pathfinder: I. System Description
• Radio and Millimeter Continuum Surveys and their Astrophysical Implications
• The Rapid ASKAP Continuum Survey I: Design and First Results
• The Nature of Radio Emission from Distant Galaxies: The 1.4 GHz Observations
• Gravitational torque-driven black hole growth and feedback in cosmological simulations
• Science With The Australian Square Kilometre Array Pathfinder
• The LOFAR Two Meter Sky Survey: Deep Fields, I -- Direction-dependent calibration and imaging
• Faceting for direction-dependent spectral deconvolution
• Resolving the Radio Source Background: Deeper Understanding Through Confusion
• A lack of evolution in the very bright-end of the galaxy luminosity function from z = 8-10
• Radio interferometric gain calibration as a complex optimization problem
• VLA-COSMOS 3GHz Large Project: The infrared-radio correlation of star-forming galaxies and AGN to $z\lesssim 6$
• The VLA-COSMOS 3 GHz Large Project: Multiwavelength counterparts and the composition of the faint radio population
• The faint radio sky: radio astronomy becomes mainstream
• The Star Formation History of the Universe as Revealed by Deep Radio Observations
• The Rapid ASKAP Continuum Survey Paper II: First Stokes I Source Catalogue Data Release
• Lightcone mock catalogues from semi-analytic models of galaxy formation - I. Construction and application to the BzK colour selection
• LOFAR/H-ATLAS: The low-frequency radio luminosity - star-formation rate relation
• The Spitzer Extragalactic Representative Volume Survey (SERVS): survey definition and goals
• The Phoenix Deep Survey: The 1.4 GHz microJansky catalogue
• MoMaF : The Mock Map Facility
• The Radio Spectral Energy Distribution and Star Formation Rate Calibration in Galaxies
• The LOFAR window on star-forming galaxies and AGN - curved radio SEDs and IR-radio correlation at $0<z<2.5$
• The VLA-VIRMOS Deep Field I. Radio observations probing the microJy source population
• The Deep SWIRE Field I. 20cm Continuum Radio Observations: A Crowded Sky
• Deep multi-frequency radio imaging in the Lockman Hole using the GMRT and VLA: I. The nature of the sub-mJy radio population
• The Tiered Radio Extragalactic Continuum Simulation (T-RECS)
• The VLA-COSMOS Survey: III. Further Catalog Analysis and the Radio Source Counts
• The infrared-radio correlation of star-forming galaxies is strongly M${}_{\star }$-dependent but nearly redshift-invariant since z$\sim$4
• Radio faint AGN: a tale of two populations
• The 1.28 GHz MeerKAT DEEP2 Image
• A radio spectral index map and catalogue at 147-1400 MHz covering 80 per cent of the sky
• Deep Extragalactic VIsible Legacy Survey (DEVILS): Motivation, Design and Target Catalogue
• The VLA Survey of the Chandra Deep Field South: I. Overview of the Radio Data
• Herschel-ATLAS: The far-infrared--radio correlation at z<0.5
• The LOFAR Two-metre Sky Survey Deep fields: The star formation rate - radio luminosity relation at low frequencies
• The XMM-SERVS survey: new XMM-Newton point-source catalog for the XMM-LSS field
• A Deep VLA survey at 20cm of the ISO ELAIS survey regions
• Black Hole -- Galaxy Correlations in Simba
• The accretion history of the Universe with the SKA
• Galaxy And Mass Assembly: The 1.4GHz SFR indicator, SFR-M* relation and predictions for ASKAP-GAMA
• The Radio/Optical Catalog of the SSA13 Field
• Reproducing sub-millimetre galaxy number counts with cosmological hydrodynamic simulations
• Radio-Quiet Quasars in the VIDEO Survey: Evidence for AGN-powered radio emission at S_1.4GHz < 1 mJy
• The Lockman Hole Project: new constraints on the sub-mJy source counts from a wide-area 1.4 GHz mosaic
• LOFAR-Boötes: Properties of high- and low-excitation radio galaxies at $0.5<z<2.0$
• Evidence that the AGN dominates the radio emission in z ~ 1 radio-quiet quasars
• Deep 3 GHz Observations of the Lockman Hole North with the Very Large Array -2. Catalogue and μJy source properties
• An infrared-radio simulation of the extragalactic sky: from the Square Kilometer Array to Herschel
• Sample variance, source clustering and their influence on the counts of faint radio sources
• The relationship between star formation rate and radio synchrotron luminosity at 0 < z < 2
• The Spectral Energy Distribution of Powerful Starburst Galaxies I: Modelling the Radio Continuum
• The rest-frame UV luminosity function at $z\simeq 4$: a significant contribution of AGN to the bright-end of the galaxy population
• MIGHTEE: the nature of the radio-loud AGN population
• Contribution to the Diffuse Radio Background from Extragalactic Radio Sources
• Extremely deep 150 MHz source counts from the LoTSS Deep Fields
• Deep Extragalactic VIsible Legacy Survey (DEVILS): Consistent multi-wavelength photometry for the DEVILS regions (COSMOS, XMMLSS & ECDFS)
• A Multi-wavelength Analysis of the Faint Radio Sky (COSMOS-XS): the Nature of the Ultra-faint Radio Population
• The XMM-SERVS survey: XMM-Newton point-source catalogs for the W-CDF-S and ELAIS-S1 fields
• Radio spectral properties of star-forming galaxies in the MIGHTEE-COSMOS field and their impact on the far-infrared-radio correlation
• An Ultra-deep Multi-band VLA Survey of the Faint Radio Sky (COSMOS-XS): Source Catalog and Number Counts
• Evolution of the galaxy stellar mass function: evidence for an increasing $M^{\ast }$ from $z=2$ to the present day
• The Radio Galaxy Population in the SIMBA SImulations
• The contribution of discrete sources to the sky temperature at 144 MHz
• Source Counts Spanning Eight Decades of Flux Density at 1.4 GHz
• LOFAR observations of the XMM-LSS field
• Deep GMRT 610 MHz Observations of the ELAIS N1 Field : Catalogue and Source Counts
• VLA imaging of the XMM-LSS / VIDEO deep field at 1-2 GHz
• Cosmic Star-Formation History Measured at 1.4 GHz
• The Stripe 82 1-2 GHz Very Large Array Snapshot Survey: host galaxy properties and accretion rates of radio galaxies
• The Stripe 82 1-2 GHz Very Large Array Snapshot Survey: Multiwavelength Counterparts
• Far beyond stacking: Fully bayesian constraints on sub-microJy radio source populations over the XMM-LSS-VIDEO field
• The LOFAR LBA Sky Survey: Deep Fields I. The Boötes Field
• Excess in the High Frequency Radio Background: Insights from Planck

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• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• The LOFAR Two-metre Sky Survey Deep Fields Data Release 1: V. Survey description, source classifications and host galaxy properties
• Heavily Obscured AGN detection: a Radio vs X-ray challenge
• Cosmology from LOFAR Two-metre Sky Survey Data Release 2: Cross-correlation with the cosmic microwave background
• Radio-loud fraction of z>6 quasars
• The MeerKAT Absorption Line Survey: Homogeneous continuum catalogues towards a measurement of the cosmic radio dipole
• Pulsar B1237+25 Aberration/Retardation Analysis from Decimeter to Decameter Wavelength: Challenge to "Radius-to-Frequency Mapping"
• L-BASS: a project to produce an absolutely calibrated 1.4 GHz sky map, I -- Scientific rationale and system overview
• Deblending the MIGHTEE-COSMOS survey with XID+: The resolved radio source counts to $S_{1.4}\approx 5\mu$Jy
• Radio Galaxies in SIMBA: A MIGHTEE Comparison