distribution of galaxies in the parameter space. Such cancellation is probably responsible for the “conspiracy” to keep the FRC alive.'
author:
- Li Shao
- 'Bärbel S. Koribalski'
- Jing Wang
- 'Luis C. Ho'
- 'Lister Staveley-Smith'
bibliography:
- 'Shao\_LVHIS.bib'
title: 'Local Volume [[$\mathrm{H}\textsc{i}$]{}]{} Survey: the far-infrared radio correlation'
---

Introduction {#sec:intro}
============

It is well known that for normal star forming galaxies, the far-infrared (FIR) and radio continuum fluxes are correlated . This FIR-radio correlation (FRC) is one of the tightest relation in astronomy. It is partly understood with both FIR and radio emission being connected to massive stars. The major fraction of FIR emission comes from the re-emitted ultra-violet (UV) radiation by dust in star forming regions. It is often used as star formation rate (SFR) indicator . The radio continuum emission in our wavelength range has two potential major components. The thermal component is considered to be bremsstrahlung emission from hot star forming regions and the non-thermal component is believed to be associated with supernova remnants . They are both used as SFR indicators, separately or combined together [@2002AJ....124..675C; @2011ApJ...737...67M; @2017ApJ...836..185T]. However, it is known that both FIR and non-thermal radio continuum are far from perfect 