A catalog of photometric redshift and the distribution of broad galaxy
  morphologies
  We created a catalog of photometric redshift of ~3,000,000 SDSS galaxies
annotated by their broad morphology. The photometric redshift was optimized by
testing and comparing several pattern recognition algorithms and variable
selection strategies, trained and tested on a subset of the galaxies in the
catalog that had spectra. The galaxies in the catalog have i magnitude brighter
than 18 and Petrosian radius greater than 5.5''. The majority of these objects
are not included in previous SDSS photometric redshift catalogs such as the
photoz table of SDSS DR12. Analysis of the catalog shows that the number of
galaxies in the catalog that are visually spiral increases until redshift of
~0.085, where it peaks and starts to decrease. It also shows that the number of
spiral galaxies compared to elliptical galaxies drops as the redshift
increases. The catalog is publicly available at
https://figshare.com/articles/Morphology_and_photometric_redshift_catalog/4833593
