Probing the Timescale of the 1.4 GHz Radio emissions as a Star formation tracer

Abstract

Radio used as a star formation rate (SFR) tracer presents enormous advantages by being unaffected by dust and radio sources being pinpointed at the sub-arc-second level. The interpretation of the low frequency 1.4 GHz luminosity is hampered by the difficulty in modeling the cosmic ray paths in the interstellar medium, and their interactions with the magnetic field. In this work, we compare the SFR derived from radio observations, and the ones derived from spectral energy distribution (SED) modeling. We aim at better understand the behavior of the SFR radio tracer, with a specific emphasis on the link with star-formation histories. We used the SED modeling code Code Investigating GALaxy Emission, CIGALE, with a non-parametric star formation history model (SFH) and fit the data over the wavelength range from the ultraviolet (UV) up to the mid-infrared (mid-IR). We interpret the difference between radio and SED-based SFR tracers in the light of recent gradients in the derived SFH. To validate the robustness of the results, we checked for any remaining active galaxy nuclei (AGN) contribution and tested the impact of our SFH modeling approach. Approximately 27% our galaxies present a radio SFR (SFR${}_{\mathrm{radio}}$) at least ten times larger than the instantaneous SFR from SED-fitting (SFR${}_{\mathrm{SED}}$). This trend affects primarily the galaxies that show a declining SFH activity over the last 300 Myr. Both SFR indicators converge toward a consistent value, when the SFHs are averaged over a period larger than 150 Myr to derive SFR${}_{\mathrm{SED}}$. Although the radio at low frequency 1.4 GHz is a good tracer of the star formation activity of galaxies with constant or increasing SFH, our results indicate that this is not the case for galaxies that are quenching. Our analysis suggests that the star formation time sensitivity of the radio low frequency could be longer than 150 Myr.

10 pages, 10 figures

References in corpus (30)

• The James Webb Space Telescope
• A simple model to interpret the ultraviolet, optical and infrared emission from galaxies
• COSMOS2020: A panchromatic view of the Universe to $z\sim 10$ from two complementary catalogs
• A Long Time Ago in a Galaxy Far, Far Away: A Candidate z ~ 12 Galaxy in Early JWST CEERS Imaging
• X-CIGALE: fitting AGN/galaxy SEDs from X-ray to infrared
• Constraining the properties of AGN host galaxies with Spectral Energy Distribution modeling
• On the Stellar Populations of Galaxies at z=9-11: The Growth of Metals and Stellar Mass at Early Times
• Radial variation of attenuation and star formation in the largest late-type disks observed with GALEX
• The faint radio sky: radio astronomy becomes mainstream
• The far-infrared/radio correlation and radio spectral index of galaxies in the SFR-M* plane up to z 2
• LOFAR/H-ATLAS: The low-frequency radio luminosity - star-formation rate relation
• The Radio Spectral Energy Distribution and Star Formation Rate Calibration in Galaxies
• A new method to separate star forming from AGN galaxies at intermediate redshift: The submillijansky radio population in the VLA-COSMOS survey
• The VLA-COSMOS 3 GHz Large Project: Evolution of specific star formation rates out to $z\sim 5$
• The VLA-COSMOS 3~GHz Large Project: Cosmic evolution of radio AGN and implications for radio-mode feedback since z~5
• On the SFR-M${}_{\ast }$ main sequence archetypal star-formation history and analytical models
• The infrared-radio correlation of star-forming galaxies is strongly M${}_{\star }$-dependent but nearly redshift-invariant since z$\sim$4
• Impact of star formation history on the measurement of star formation rates
• The triggering probability of radio-loud AGN: A comparison of high and low excitation radio galaxies in hosts of different colors
• The Radio Continuum-Star Formation Rate Relation in WSRT SINGS Galaxies
• Cold dust and stellar emissions in dust-rich galaxies observed with ALMA: a challenge for SED-fitting techniques
• Polar dust obscuration in broad-line active galaxies from the XMM-XXL field
• The Synthetic Emission Line COSMOS catalog: H$\alpha$ and [OII] galaxy luminosity functions and counts at $0.3<z<2.5$
• Radio continuum size evolution of star-forming galaxies over 0.35 < z < 2.25
• Radio-AGN Feedback: When the Little Ones were Monsters
• Turbulent magnetic fields in the merging galaxy cluster MACS J0717.5+3745: polarization analysis
• SFR estimations from z=0 to z=0.9 -- A comparison of SFR calibrators for star-forming galaxies
• Constraining the recent star formation history of galaxies : an Approximate Bayesian Computation approach
• GOODS-ALMA 2.0: Last gigayear star formation histories of the so-called starbursts within the main sequence
• Investigating the delay between dust radiation and star-formation in local and distant quenching galaxies

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• Identification of a transition from stochastic to secular star formation around $z=9$ with JWST
• COSMOS2025: The COSMOS-Web galaxy catalog of photometry, morphology, redshifts, and physical parameters from JWST, HST, and ground-based imaging
• Value Added Catalog of physical properties of more than 1.3 million galaxies from the DESI Survey
• Radio spectral properties of star-forming galaxies between 150-5000MHz in the ELAIS-N1 field
• The COSMOS-Web ring: in-depth characterization of an Einstein ring lensing system at z~2
• COSMOS-Web: A history of galaxy migrations over the stellar mass-star formation rate plane
• Low-redshift Lyman Continuum Survey: Radio continuum properties of low-$z$ Lyman continuum emitters
• Clumpiness of galaxies revealed in the near-infrared with COSMOS-Web