Evolution of thermal and nonthermal radio continuum emission on kpc scales--Predictions for SKA

Abstract

Resolved maps of the thermal and nonthermal radio continuum (RC) emission of distant galaxies are a powerful tool for understanding the role of the interstellar medium (ISM) in the evolution of galaxies. We simulate the RC surface brightness of present-day star forming galaxies in the past at $0.15<z<3$ considering two cases of radio size evolution: (1)~no evolution, and (2)~same evolution as in the optical. We aim to investigate the a)~structure of the thermal and nonthermal emission on kpc scales, b)~evolution of the thermal fraction and synchrotron spectrum at mid-radio frequencies ($\simeq$1-10\,GHz), and c)~capability of the proposed SKA1-MID reference surveys in detecting the RC emitting structures. The synchrotron spectrum flattens with $z$ causing curvature in the observed mid-radio SEDs of galaxies at higher $z$. The spectral index reported in recent observational studies agrees better with the no size evolution scenario. In this case, the mean thermal fraction observed at 1.4\,GHz increases with redshift by more than 30\% from $z=0.15$ to $z=2$ because of the drop of the synchrotron emission at higher rest-frame~frequencies. More massive galaxies have lower thermal fractions and experience a faster flattening of the nonthermal spectrum. The proposed SKA1-MID band~2 reference survey, unveils the ISM in M51- and NGC6946-like galaxies (with ${\mathrm{M}}_{\star }\simeq 10^{10}{\mathrm{M}}_{\odot }$) up to $z=3$. This survey detects lower-mass galaxies like M33 (${\mathrm{M}}_{\star }\simeq 10^9{\mathrm{M}}_{\odot }$) only at low redshifts $z\lesssim 0.5$. For a proper separation of the RC emitting processes at the peak of star formation, it is vital to include band~1 into the SKA1-MID reference surveys.

arXiv commentaccepted for publication in MNRAS journal

References in corpus (94)

• Cosmic Star Formation History
• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• Star Formation in AEGIS Field Galaxies since z=1.1 : The Dominance of Gradually Declining Star Formation, and the Main Sequence of Star-Forming Galaxies
• The Star Formation Efficiency in Nearby Galaxies: Measuring Where Gas Forms Stars Effectively
• The Initial Mass Function of Stars: Evidence for Uniformity in Variable Systems
• A Highly Consistent Framework for the Evolution of the Star-Forming "Main Sequence" from z~0-6
• 3D-HST+CANDELS: The Evolution of the Galaxy Size-Mass Distribution since $z=3$
• PHIBSS: molecular gas content and scaling relations in z~1-3 normal star forming galaxies
• Constraining the Low-Mass Slope of the Star Formation Sequence at 0.5<z<2.5
• Calibrating Extinction-Free Star Formation Rate Diagnostics with 33GHz Free-Free Emission in NGC6946
• The Herschel view of the dominant mode of galaxy growth from z=4 to the present day
• Estimating Star Formation Rates from Infrared and Radio Luminosities: The Origin of the Radio-Infrared Correlation
• Different star formation laws for disks versus starbursts at low and high redshifts
• PHIBSS: Unified Scaling Relations of Gas Depletion Time and Molecular Gas Fractions
• Strangulation as the primary mechanism for shutting down star formation in galaxies
• Updated Nearby Galaxy Catalog
• ISM masses and the star formation law at Z = 1 to 6 // ALMA observations of dust continuum in 145 galaxies in the COSMOS survey field
• An interferometric CO survey of luminous submm galaxies
• KINGFISH -- Key Insights on Nearby Galaxies: A Far-Infrared Survey with Herschel: Survey Description and Image Atlas
• The Size Evolution of High Redshift Galaxies
• Evolution of Interstellar Medium, Star Formation, and Accretion at High Redshift
• The Far- and Mid-Infrared/Radio Correlations in the Spitzer Extragalactic First Look Survey
• The SFR-M* Relation and Empirical Star-Formation Histories from ZFOURGE at 0.5 < z < 4
• Planetary Nebulae as Standard Candles. XII. Connecting the Population I and Population II Distance Scales
• Magnetic fields and spiral arms in the galaxy M51
• A Turnover in the Galaxy Main Sequence of Star Formation at $M_{\ast }\sim 10^{10}{M}_{\odot }$ for Redshifts $z<1.3$
• ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Survey Description
• The Physics of the FIR-Radio Correlation: I. Calorimetry, Conspiracy, and Implications
• Magnetism in the spiral galaxy NGC 6946: magnetic arms, depolarization rings, dynamo modes and helical fields
• Magnetic Fields in High-Mass Infrared Dark Clouds
• Radio Emission from Galaxies In The Hubble Deep Field
• The SILCC project: III. Regulation of star formation and outflows by stellar winds and supernovae
• VLA-COSMOS 3GHz Large Project: The infrared-radio correlation of star-forming galaxies and AGN to $z\lesssim 6$
• The Star Formation History of the Universe as Revealed by Deep Radio Observations
• The far-infrared/radio correlation and radio spectral index of galaxies in the SFR-M* plane up to z 2
• Simulating cosmic ray physics on a moving mesh
• The Radio Spectral Energy Distribution and Star Formation Rate Calibration in Galaxies
• BLAST: the far-infrared/radio correlation in distant galaxies
• The Evolution of the Baryons Associated with Galaxies Averaged over Cosmic Time and Space
• Evolution of the Sizes of Galaxies over 7<z<12 Revealed by the 2012 Hubble Ultra Deep Field Campaign
• Half-mass radii for ~7,000 galaxies at 1.0 < z < 2.5: most of the evolution in the mass-size relation is due to color gradients
• The VLA-COSMOS 3 GHz Large Project: Evolution of specific star formation rates out to $z\sim 5$
• The FIR/Radio correlation of high redshift galaxies in the HDF-N
• The infrared-radio correlation of star-forming galaxies is strongly M${}_{\star }$-dependent but nearly redshift-invariant since z$\sim$4
• Star formation in M33: multiwavelength signatures across the disk
• Magnetic fields in Local Group dwarf irregulars
• High-resolution radio continuum survey of M33 II. Thermal and nonthermal emission
• A Detailed Study of the Radio--FIR Correlation in NGC6946 with Herschel-PACS/SPIRE from KINGFISH
• Spitzer Mid-Infrared Spectroscopy of Infrared Luminous Galaxies at z~2 III: Far-IR to Radio Properties and Optical Spectral Diagnostics
• The local radio-IR correlation in M51
• The Radio Continuum-Star Formation Rate Relation in WSRT SINGS Galaxies
• The sizes of massive quiescent and star forming galaxies at z~4 with ZFOURGE and CANDELS
• Evolution of the Far-Infrared-Radio Correlation and Infrared SEDs of Massive Galaxies over z = 0 - 2
• High-resolution radio continuum survey of M33: III. Magnetic fields
• Two-phase galaxy evolution: the cosmic star-formation histories of spheroids and discs
• Multi-scale Radio-IR Correlations in M31 and M33: The Role of Magnetic Fields and Star Formation
• The GOODS-N Jansky VLA 10 GHz Pilot Survey: Sizes of Star-Forming $\mu$Jy Radio Sources
• How cosmic-ray electron propagation affects radio-far-infrared correlations in M31 and M33
• The evolution of the mass-size relation to z=3.5 for UV-bright galaxies and sub-mm galaxies in the GOODS-NORTH field
• The relationship between star formation rate and radio synchrotron luminosity at 0 < z < 2
• The non-linear infrared-radio correlation of low-z galaxies: implications for redshift evolution, a new radio SFR recipe, and how to minimize selection bias
• AGN feedback in the nucleus of M51
• Analysis of the SFR - M* plane at z<3: single fitting versus multi-Gaussian decomposition
• Angular Sizes of $\mu$Jy Radio Sources
• The Role of Merger Stage on Galaxy Radio Spectra in Local Infrared-Bright Starburst Galaxies
• Radio spectral properties of star-forming galaxies in the MIGHTEE-COSMOS field and their impact on the far-infrared-radio correlation
• What Drives Galaxy Quenching? Resolving Molecular Gas and Star Formation in the Green Valley
• Radio--Far infrared correlation in "blue cloud" galaxies with 0<z<1.2
• Radio continuum size evolution of star-forming galaxies over 0.35 < z < 2.25
• Efficient cold outflows driven by cosmic rays in high redshift galaxies and their global effects on the IGM
• Discovery of massive star formation quenching by nonthermal effects in the center of NGC 1097
• Evolution of LMC/M33-mass dwarf galaxies in the EAGLE simulation
• The Far-Infrared Radio Correlation at low radio frequency with LOFAR/H-ATLAS
• Deep GMRT 150 MHz observations of the LBDS-Lynx region: Ultra-Steep Spectrum Radio Sources
• Investigation of the cosmic ray population and magnetic field strength in the halo of NGC 891
• Multiwavelength characterization of faint Ultra Steep Spectrum radio sources : A search for high-redshift radio galaxies
• The Far-Infrared Luminosity Function from GOODS-N: Constraining the Evolution of Infrared Galaxies for z \leq 1
• Does the evolution of the radio luminosity function of star-forming galaxies match that of the star-formation rate function?
• The eMERGE Survey I: Very Large Array 5.5 GHz observations of the GOODS-North Field
• High resolution radio continuum survey of M33: I. The radio maps
• An Empirical Relation Between The Large-Scale Magnetic Field And The Dynamical Mass In Galaxies
• The abundance of dwarf galaxies around low-mass giants in the Local Volume
• The VLA-COSMOS 3 GHz Large Project: Average radio spectral energy distribution of highly star-forming galaxies
• Density waves and star formation in grand design spirals
• Stopping Cooling Flows with Cosmic Ray Feedback
• Starburst and post-starburst high-redshift protogalaxies: The feedback impact of high energy cosmic rays
• Linear radio size evolution of $\mu$Jy populations
• Radio Observations of the Hubble Deep Field South region: I. Survey Description and Initial Results
• Stellar and Molecular Gas Rotation in a Recently-Quenched Massive Galaxy at z~0.7
• The role of the halo magnetic field on accretion through High-Velocity Clouds
• COLDz: Probing Cosmic Star Formation With Radio Free-free Emission
• A Spatially Resolved Radio Spectral Index Study of the Dwarf Irregular Galaxy NGC\,1569
• Revisiting the Giant Radio Galaxy ESO 422-G028: Part I. Discovery of a neutral inflow and recent star formation in a restarted giant
• The faint HI environment of galaxies: a laboratory for testing galaxy formation

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