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We present an analysis of the sky distribution of neutral hydrogen (HI)deficiency and spectral asymmetry for galaxies detected by the HI ParkesAll-Sky Survey (HIPASS) as a function of projected environment density.Previous studies of galaxy HI deficiency using HIPASS were sensitive togalaxies that are extremely HI rich or poor. We use an updated binningstatistic for measuring the global sky distribution of HI deficiency that issensitive to the average deficiencies. Our analysis confirms the result fromprevious studies that galaxies residing in denser environments, such as Virgo,are on average more HI deficient than galaxies at lower densities. However,many other individual groups and clusters are not found to be on averagesignificantly HI poor, in contradiction to previous work. In terms of HIspectral asymmetries, we do not recover any significant trend of increasingasymmetry with environment density as found for other galaxy samples. We alsoinvestigate the correlation between HI asymmetry and deficiency, but find novariation in the mean asymmetry of galaxies that are HI rich, normal or poor.This indicates that there is either no dependence of asymmetry on HIdeficiency, or a galaxy's HI deficiency only has a small influence on themeasured HI asymmetry that we are unable to observe using only integratedspectra.

HI Deficiencies and Asymmetries in HIPASS Galaxies