I don't have any specific ranking about accounting phd. But you can find relevant info in '1. Business Research in Eight Business Disciplines", "3 Business School Research Performance: An Update" and "7 MEASURING CANADIAN BUSINESS SCHOOL RESEARCH OUTPUT AND IMPACT".
First, congratulations to your offers! Phd application is very competitive. You did great on your application. I just want to share my thoughts on the school's ranking. this ranking is based on all disciplines, the reference value is limited. For example, the U of Rochester ranked 33. however its finance and accounting should be on top 5.