The Astrophysical Journal

The Astrophysical Journal, often abbreviated ApJ (pronounced "ap jay") in references and speech, is a peer-reviewed scientific journal of astrophysics, established in 1895 by American astronomers George Ellery Hale and James Edward Keeler. As of 2013 it published three 900-page issues per month.

Since 1953 The Astrophysical Journal Supplement Series (ApJS) has been published in conjunction with The Astrophysical Journal, with generally longer articles to supplement the material in the journal. It publishes six volumes per year, with two 280-page issues per volume.

The Astrophysical Journal Letters (ApJL) is another section of The Astrophysical Journal which rapidly publishes short communications.

The journal and the supplement series were both published by the University of Chicago Press for the American Astronomical Society until, in January 2009, publication was transferred to IOP Publishing, following the move of the society's Astronomical Journal in 2008. The reason for the changes were given by the society as the increasing financial demands of the University of Chicago Press.

APJ

APJ may refer to: