I was looking for TeX Live distribution for OS X, and MacTeX appears to be the one.
The installation is very easy. Just download a mpkg.zip file, decompress, and click on .mpkg to start the usual OS X install procedure. After the installation, all the familiar LaTeX shell commands will be available. Pretty much the same as on Linux.
A good news for people in astrophysics is that the AASTeX and emulateapj class files are installed by default. The ApJ font style file apjfonts.sty, however, is not. It is easy to install this via command line:
$ wget http://hea-www.harvard.edu/~alexey/emulateapj/apjfonts.sty $ sudo mv apjfonts.sty /usr/local/texlive/2010/texmf-dist/tex/latex/emulateapj $ sudo texconfig rehash