Interpreting the observed 21-cm HI power spectrum

In this paper I investigate what factors - both observational and physical - can change the measured slope of the observed 21-cm H-I power spectrum. The following effects can make the observed turbulence appear two dimensional rather than. three dimensional: 1) if the turbulence is contained in a thin filament or slab; 2) if the medium has a high optical depth; and 3) if any method of observation or analysis is used which effectively limits the emission from the medium under study to a thin slab, for example, by analyzing an individual channel map. Straightforward analysis of data can give misleading or incomplete results if these effects axe not taken into account.