The venerable The Burlington Magazine (b. 1903) is required reading for aesthetes and indispensable for connoisseurs and art professionals.
Now established as a non-profit-making company with independent charitable status, it continues to publish scholarly but accessible art historical articles based on original research. This takes in new works and rediscovered treasures as well as editorials, reviews, interpretation, analysis and opinion by reliable scholars. You get event guides, authoritative book and exhibition reviews and major exhibitions.
The Burlington Magazine doesn’t come cheap, but you won’t waste time looking around for anything else.