Elsevier launched new NeuroImage: Report as a companion journal to NeuroImage. What does companion mean here in terms of publishing content, cite-score and impact factors.
Companion journals are separate journals on the same topic. The content and bibliometrics, including impact factor, are different.
Usually, the newer journal is considered lower quality. It has different editorial standards.
An example of three companion journals:
- Nature (1869)
- Nature Communications (2010)
- Scientific reports (2011)
The purpose of a companion journal is to increase the revenue a publisher gets from publication charges without decreasing the quality of the original journal.