The 943 MHz radio-SFR relation of nearby galaxies observed with ASKAP
Abstract
We investigate the integrated 943 MHz radio-infrared and radio-star-formation-rate (SFR) relations of 875 nearby galaxies within D<50 Mpc using public Australian SKA Pathfinder (ASKAP) observations. After excluding galaxies with identified or candidate AGN activity, 594 galaxies remain in the AGN-cleaned sample. We used Bayesian errors-in-variables models that account for measurement uncertainties, intrinsic scatter, and correlated distance errors. The AGN-cleaned radio-infrared relation is nearly linear, Lν,943∝ Lν,W41.09±0.02, with an orthogonal intrinsic scatter of 0.21±0.01 dex, and is tighter than the AGN-host relation. For 592 AGN-cleaned galaxies, the radio-SFR relation is approximately linear, Lν,943∝SFR1.02±0.02, with an intrinsic scatter of 0.25±0.01 dex. Semi-calorimetric models reveal positive secondary dependences on stellar mass, γ=0.09±0.03, and rotation velocity, δ=0.24±0.08. The consistency between these two secondary trends suggests that the galaxy gravitational potential may weakly regulate CRE confinement and synchrotron-radiation efficiency. Our results provide an integrated 943 MHz radio-SFR calibration for nearby galaxies and show that, although radio luminosity scales nearly proportionally with SFR on average, weak secondary dependences on galaxy properties remain.
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BibTeX
@misc{wang2026radiosfr,
title = {{The 943 MHz radio-SFR relation of nearby galaxies observed with ASKAP}},
author = {Shengtao Wang and Xiaohui Sun and Jiangtao Li and Chao-Wei Tsai and Jianghui Xu},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.41895},
eprint = {2610.41895},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.41895},
}
RIS
TY - UNPB
TI - The 943 MHz radio-SFR relation of nearby galaxies observed with ASKAP
AU - Shengtao Wang
AU - Xiaohui Sun
AU - Jiangtao Li
AU - Chao-Wei Tsai
AU - Jianghui Xu
PY - 2026
DA - 2026/10/30
PB - arXiv
DO - 10.48550/arxiv.2610.41895
UR - https://arxiv.org/abs/2610.41895
AB - We investigate the integrated 943 MHz radio-infrared and radio-star-formation-rate (SFR) relations of 875 nearby galaxies within D<50 Mpc using public Australian SKA Pathfinder (ASKAP) observations. After excluding galaxies with identified or candidate AGN activity, 594 galaxies remain in the AGN-cleaned sample. We used Bayesian errors-in-variables models that account for measurement uncertainties, intrinsic scatter, and correlated distance errors. The AGN-cleaned radio-infrared relation is nearly linear, L_ν,943∝ L_ν,W4^1.09±0.02, with an orthogonal intrinsic scatter of 0.21±0.01 dex, and is tighter than the AGN-host relation. For 592 AGN-cleaned galaxies, the radio-SFR relation is approximately linear, L_ν,943∝SFR^1.02±0.02, with an intrinsic scatter of 0.25±0.01 dex. Semi-calorimetric models reveal positive secondary dependences on stellar mass, γ=0.09±0.03, and rotation velocity, δ=0.24±0.08. The consistency between these two secondary trends suggests that the galaxy gravitational potential may weakly regulate CRE confinement and synchrotron-radiation efficiency. Our results provide an integrated 943 MHz radio-SFR calibration for nearby galaxies and show that, although radio luminosity scales nearly proportionally with SFR on average, weak secondary dependences on galaxy properties remain.
ER -