WISE photometry of sources in the SDSS catalogs
There are three versions of the catalogs:
- sdss-dr10d
- Uses the catalog from the SDSS-DR10 release. This is the version described in Lang, Hogg & Schlegel (2016).
- sdss-dr13
- Uses the catalog from the SDSS-DR13 release (which was still private to the SDSS collaboration at the time the paper was published).
- eboss
- The version used for targeting of the SDSS-IV/eBOSS survey, like sdss-dr13 but with only W1/W2.
Code can be found here: https://github.com/dstndstn/unwise-sdss-phot.
Contents:
sdss-dr10d-fields.fits- A table of SDSS fields for which forced photometry exists.
sdss-dr10d-tiles.fits- A table of WISE coadd tiles for which forced photometry exists.
specmatch-dr10.fits- SDSS DR10 spectra matched to our WISE photomtery. This is the DR10 specObj file augmented with our sdss-dr10d photometry for matching rows.
sdss-dr10d-pobj/- Our WISE photometry results, in files that are row-by-row parallel to the SDSS DR10 photoObj files. The directory structure follows the same pattern too:
%(run)i/%(camcol)i/photoWiseForced-%(run)06i-%(camcol)i-%(field)04i.fits.
sdss-dr10d-phot/- Our WISE photometry results, in files corresponding to WISE coadd tiles. These include SDSS sources within the tile, plus a margin. The same SDSS object may appear in multiple tiles. The filename is based on the WISE tile name, which encodes an approximate RA, Dec center;
phot-RRRR[pm]DDD.fits is the tile centered at roughly RRR.R degrees RA, DD.D degrees Dec.
sdss-dr10d-SEDs- "I just want RA,Dec, and the SDSS and WISE SEDs." Reasonable enough request! See the description below for details.
sdss-dr10d-{phot,pobj}/md5sums.txt- Checksums for all files. Pro tip: you could edit this file to produce a "wget" script, if you were so inclined.
sdss-dr13-* and eboss-- Same as for sdss-dr10d. The equivalent of
sdss-dr10d-tiles.fits is named {sdss-dr13,eboss}-atlas.fits.
specmatch-dr12.fits- SDSS DR12 spectroscopy matched to our sdss-dr13 results.
See Appendix A of Lang, Hogg & Schlegel (2016) for a description of the catalog contents.
The SED tables, one per SDSS run+camcol, contain
| Column number |
Column name |
Data type |
| 1 | ra | D |
| 2 | dec | D |
| 3 | pointsource | L |
| 4 | w1_nanomaggies | E |
| 5 | w1_nanomaggies_ivar | E |
| 6 | w2_nanomaggies | E |
| 7 | w2_nanomaggies_ivar | E |
| 8 | w3_nanomaggies | E |
| 9 | w3_nanomaggies_ivar | E |
| 10 | w4_nanomaggies | E |
| 11 | w4_nanomaggies_ivar | E |
| 12 | sdss_flux | 5E |
| 13 | sdss_flux_ivar | 5E |
Where "pointsource" = SDSS point source or treated_as_pointsource, "sdss_flux" = SDSS PSF flux for "pointsource" objects, "cmodelflux" otherwise.