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Detection of bending waves is a highly challenging task even in nearby discgalaxies due to their sub-kpc bending amplitudes. However, simulations showthat the harmonic bending of a Milky Way like disc galaxy is associated with aharmonic fluctuation in the measured line of sight (los) velocities as well,and can be regarded as a kinematic signature of a manifested bending wave.Here, we look for similar kinematic signatures of bending waves in \HI discs,as they extend to much beyond the optical radii.  We present a multipole analysis of the \HI los residual velocity fields ofsix nearby spiral galaxies from the THINGS sample, which uncovers the bendingwave-induced velocity peaks. This allows us to identify the radial positionsand amplitudes of the different bending modes present in the galaxies. We findthat all of our sample discs show a combined kinematic signature ofsuperposition of a few lower-order bending modes, suggesting that bending wavesare a common phenomenon. The identified velocity peaks are found to be of modes$m=2,3$ and $4$, not more than 15 km s$^{-1}$ in amplitude and spread acrossthe entire \HI disc. Interestingly, they appear to be concentrated near theoptical edge of their host galaxies. Also, $m=2$ appears to be more common thanthe other two modes.

Bending Waves in Velocity Space: a First Look at the THINGS sample