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We present the results of a deep survey of the nearby Sculptor group and theassociated Sculptor filament taken with the Parkes 64-m radio telescope in the21-cm emission line of neutral hydrogen. We detect 31 HI sources in theSculptor group/filament, eight of which are new HI detections. We derive aslope of the HI mass function along the Sculptor filament of $\alpha =-1.10^{+0.20}_{-0.11}$, which is significantly flatter than the global massfunction and consistent with the flat slopes previously found in otherlow-density group environments. Some physical process, such as star formation,photoionisation or ram-pressure stripping, must therefore be responsible forremoving neutral gas predominantly from low-mass galaxies. All of our HIdetections have a confirmed or tentative optical counterpart and are likelyassociated with luminous rather than 'dark' galaxies. Despite a column densitysensitivity of about $4 \times 10^{17}~\mathrm{cm}^{-2}$, we do not find anytraces of extragalactic gas or tidal streams, suggesting that the Sculptorfilament is, at the current time, a relatively quiescent environment that hasnot seen any recent major interactions or mergers.

A deep Parkes HI survey of the Sculptor group and filament: HI mass function and environment