Often called "Academic Journals" or "Scholarly Journals," these too are published like magazines, though not all of them are as glossy and shiny as your typical magazine. Even though Outdoor Photographer has a specific audience, journals have even narrower audiences. They're for experts in a certain field. Let's say you're a potato farmer, and you want to keep up on the latest and greatest information on potatoes. You'd want to subscribe to The American Journal of Potato Research. Yup. It's a thing. Maybe you need Flavor and Fragrance Journal because you work with flavors and fragrances. How about Waste Management for, you know, people that work in that line. They've got to stay on top of contemporary research so they don't end up neck deep in... Um... Well, now you know about academic journals!
Also, you'll notice that academic journal focus mostly on new research. It's the most up-to-date with what's going in a field. So you'll see a lot of studies. A lot of data. Many of the "popular magazines" will essentially be condensations and summations of one or several research studies found in academic journals. When you see something in a newspaper or magazine that says, "According to studies..." you now know where these journalists got their information. And you can go straight to the original source--the academic journal. That's a much better resource!
Most academic journals will use Peer Review to make sure that the articles are authentic and high quality. The publication will share the article with selected members of the field--other experts-- who will verify the awesomeness of the study and article. This creates a series of checks and balances to ensure quality. In EBSCO Discovery, there is a check box that will limit searches to only articles that have been peer reviewed.