1861-71 Census lookup - Annie Cowan

[casabob]

Best wishes to all for the new year!!

Could anyone please look up an Anne Cowan (née Brew), born circa 1841 in Ireland, but living in the Manchester / Salford area?  Her husband was called Arthur William Cowan (also Irish), and she may have had a son called Thomas (born circa 1859). 

Secondly, Arthur William is said to have died in South America of yellow fever - how does one go about tracking down his death???

Many thanks in advance

Casabob