Abstract: We present a catalog of 9316 spectroscopically confirmed white dwarfs from the Sloan Digital Sky Survey Data Release 4. We have selected the stars through photometric cuts and spectroscopic modeling, backed up by a set of visual inspections. Roughly 6000 of the stars are new discoveries, roughly doubling the number of spectroscopically confirmed white dwarfs. We analyze the stars by performing temperature and surface gravity fits to grids of pure hydrogen and helium atmospheres. Among the rare outliers are a set of presumed helium-core DA white dwarfs with estimated masses below 0.3 Msun, including two candidates that may be the lowest masses yet found. We also present a list of 928 hot subdwarfs.

A copy of the accepted paper can be found in astro-ph/0606700.

We are also making available the 10,000 figures that display the likelihood contours for the model atmosphere fitting and the best-fit model overplotted on the spectrum. We strongly recommend inspecting the figures before trusting the fit to any given star. This is also an easy way to pull up the spectrum of any given object. We also include a link to the CAS Exploration page for this object, from which further information is available including the spectrum in FITS format. Here is the link to the page that contains these links. Warning: even this list of links is 2.5 MB.

Finally, if you want all of the postscript figures, here is a tarball of the 10,000 gzipped postscript files (230 MB).

Contact Daniel Eisenstein (deisenstein@as.arizona.edu) if you have questions about these figures or the model fits.