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Using a sample of 38 radio-loud galaxy mergers at z<=0.2, we confirm the highdetection rate (~84%) of HI 21-cm absorption in mergers, which is significantlyhigher (~4 times) than in non-mergers. The distributions of the HI columndensity [N(HI)] and velocity shift of the absorption with respect to thesystemic redshift of the galaxy hosting the radio source in mergers aresignificantly different from that in non-mergers. We investigate the connectionof the nuclear HI gas with various multi-wavelength properties of the mergers.While the inferred N(HI) and gas kinematics do not show strong (i.e. >=3-sigmalevel) correlation with galaxy properties, we find that the incidence and N(HI)of absorption tend to be slightly higher at smaller projected separationsbetween the galaxy pairs and among the lower stellar mass-radio galaxies. Theincidence, N(HI) and line width of HI absorption increase from the pre-mergerto the post-merger stages. The 100% detection rate in post-mergers indicatesthat the neutral gas in the circumnuclear regions survives the coalescenceperiod and is not yet quenched by the nuclear radio activity.

Prevalence of neutral gas in centres of merging galaxies-II: nuclear HI and multi-wavelength properties