AASTeX is a LaTeX-based package that can be used to mark up manuscripts for
American Astronomical Society (AAS) journals. AASTeX enables you to prepare
manuscripts and tables for electronic submission to The Astronomical Journal
(AJ) and The Astrophysical Journal (ApJ).

WWW: http://authors.iop.org/atom/help.nsf/LookupJournalSpecific/WebLatexGuidelines~AJ