Survey [LVHIS, @2018MNRAS.tmp..467K]. The LVHIS sample is a collection of gas rich galaxies, suitable for studying the star formation properties of dwarf galaxies. The LVHIS sample is close to volume limited (in sense of [[$\mathrm{H}\textsc{i}$]{}]{} mass), making it easier to interpret the statistical results of this sample. We will describe our galaxy sample and data reduction in Section \[sec:data\]. In Section \[sec:emission\], we will study FRC itself and its star formation origin. In Section \[sec:galprop\] we will study the relation between FRC and various galaxy properties.

Data {#sec:data}
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LVHIS and dwarf galaxy sample
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LVHIS is a southern sky survey for all [[$\mathrm{H}\textsc{i}$]{}]{} rich nearby galaxies carried out with the Australia Telescope Compact Array (ATCA). ATCA is a radio telescope array of six $22\,\mathrm{m}$ diameter dishes, located near Narrabri in New South Wales, Australia. The primary beam size is 33.6 arcmin at 1.4 GHz. The longest baseline is $6\,\mathrm{km}$, giving highest spatial resolution around 7 arcsec at 1.4 GHz.

The LVHIS sample is a collection of all galaxies with Local Group velocities $v_{LG}<550{\ensuremath{\,\mathrm{km\,s^{-1}}}}$ or distance $D<10{\ensuremath{\,\mathrm{Mpc}}}$ detected by [[$\mathrm{H}\textsc{i}$]{}]{} Parkes All Sky Survey [HIPASS, @2001MNRAS.322..486B]. There are 82 galaxies in this [[$\mathrm{H}\textsc{i}$]{}]{} selected sample (see Table \[tab:name\]). In this 