Why are hot desert's are located on 30(degrees)N/S of the equator on the western part of the continents

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Hot deserts are located between 15(degrees) & 30(degrees)N/S of the equator on the western part of the continents where the trade winds are off-shore. As a result they don't contain moisture but contain heat which they are carrying away from the sub-tropical high pressure belts. Moreover, the whole of Arabia, N.W.India etc. region fall under the descending limb of the Walker Cell originating over Indonesia which makes these regions a "heat sink" as a result temperatures remain high & pressure low since, density is low as the heat energy is encouraging individual atoms & molecules to move away from each other by breaking away the inter-molecular force of attraction. The presence of cold currents have  a desiccating effect on the climate of these hot deserts aa they don't emit sensible or latent heat as they travel along like their warm counterparts. For eg.-cold canaries current & cold benguela current  flow along the western part of Africa, Californian & Peruvian current flow along the western side of American continent & Cold west Australian current flow on the western portion of Australasia continent. Although warm air rises from this region as part of convection current they are not moisture laden. So, there is no scope of moisture content being present. Moreover, if we assume that there is moisture content but it would be swept away by the constant trade winds.

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