HI There, Barrowhouse is just outside Athy on the border with Laois , it's a very small place with just a small pretty Church with a cemetry joined onto it a few scattered houses, The records for the area are held at the big church here in Athy, St Michaels, so if you wrote to the registrar there with what you do have, his approx DOB and Barrowhouse as his parish, and ask her to do a search you might come up with something but she is very slow to do anything with requests and as she is the only one with access to the records in the area it can be very frustrating indeed !
I believe a copy of the records are held at the Library in Newbridge so if you do manage a trip over you could while away a few hours going through them and maybe come up wih something yourself, otherwise maybe as a local researcher to undertake the search for you but I know they are notoriously expensive. As to why he left Ireland it was before the famine struck Ireland so you can rule that out as a reason, most emigrants then would simply have been looking for work I would imagine ? sorry cant be of much help, if it was possible for me to do a quick search for you it would be no problem but no one is allowed to I'm afraid, regards Damsel