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The third release of the Gaia catalogue contains the radial velocities for33,812,183 stars having effective temperatures ranging from 3100 K to 14,500 K.The measurements are based on the comparison of the observed RVS spectrum(wavelength coverage: 846--870 nm, median resolving power: 11,500) to syntheticdata broadened to the adequate Along-Scan Line Spread Function. The additionalline-broadening, fitted as it would only be due to axial rotation, is alsoproduced by the pipeline and is available in the catalogue (field namegaia_source:vbroad). To describe the properties of the line-broadeninginformation extracted from the RVS and published in the catalogue, as well asto analyse the limitations imposed by the adopted method, wavelength range, andinstrument. We use simulations to express the link existing between the linebroadening measurement provided in Gaia Data Release 3 and Vsin(i). We thencompare the observed values to the measurements published by various cataloguesand surveys (GALAH, APOGEE, LAMOST, ...). While we recommend being cautious inthe interpretation of the vbroad measurement, we also find a reasonable globalagreement between the Gaia Data Release 3 line broadening values and thosefound in the other catalogues. We discuss and establish the validity domain ofthe published vbroad values. The estimate tends to be overestimated at thelower vsini end, and at $T_\mathrm{eff}>7500\,\mathrm{K}$ its quality andsignificance degrade rapidly when $G_\mathrm{RVS}>10$. Despite all the knownand reported limitations, the Gaia Data Release 3 line broadening cataloguecontains the measurements obtained for 3,524,677 stars with $T_\mathrm{eff}$\ranging from 3500 to 14,500 K, and $G_\mathrm{RVS}<12$. It gathers the largeststellar sample ever considered for the purpose, and allows a first mapping ofthe \Gaia\ line broadening parameter across the HR diagram.

Gaia Data Release 3: Properties of the line broadening parameter derived with the Radial Velocity Spectrometer (RVS)