Value Added Catalogs

In addition to the primary SDSS photometry and spectroscopy, there are a few extra catalogs created by our collaborators that are distributed through the SAS. These Value-Added Catalogs (VACs) are listed below, and include catalogs that were released in earlier data releases.

NASA-Sloan Atlas Images

Scientific Analysis Catalog

Galaxy image catalog based on SDSS and GALEX imaging.

Michael R. Blanton


The NASA-Sloan Atlas catalog (v1_0_1) was used to create the target catalog for the MaNGA galaxy sample. This catalog was based off of the SDSS and GALEX images in the optical and near UV, and was originally released in DR14 with the first MaNGA data release. This value-added catalog now releases the NASA-Sloan Atlas data used in the process of creating the catalog. This includes: the original catalogs upon which the full sample is based; the mosaicked FITS images for SDSS and GALEX; the FITS images of the deblended galaxies used for the photometric analysis; and other associated intermediate data and meta-data. We use SDSS images sky subtracted as described in Blanton et al. (2011) and GALEX images sky-subtracted using the standard GALEX pipeline. The deblending is performed as described in Blanton et al. (2011) and has been extended to include the GALEX images. In the catalog associated with the images, we measure fluxes in several different ways, all described in Blanton et al. (2011) and Wake et al. (2017). The full tree of data products (linked above) consist of about 15 Tb distributed in about 4 million folders and 70 million files. Most of the data size is the images. There are also several input catalogs as well as a number of intermediate result files. These are all described in their data models, and on the website linked above. The most used data products in this VAC are: The final catalog; Mosaics in FNugriz around each NSA galaxy; Deblended images in FNugriz around each NSA galaxy; Color PNG files for each NSA galaxy.

Catalog last modified: 2021-12-06 07:36:54

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