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Sloan Digital Sky Survey at the CFA Data Release 6
Spectral Line Data
The SpecLine.db starbase database is created from the Princeton group's spectral line reductions of the SDSS spectral database.The Princeton info page is:
http://spectro.princeton.eduThe database table has 22,480,122 rows, or 21 different line observations for 1,070,482 spectra. The file size is 2.8 GB.
The columns are:
specObjID objID plateID mjd fiberID line wave z z_err sigma sigerr area area_err eqw eqw_err cont cont_err pix dof chi2
The entry in the line column is a short identifier for the 21 lines below:
line name LyA Ly alpha Ha H alpha Hb H beta Hg H gamma Hd H delta C3a C III] 1908 <--(sic) typo? C4 C IV 1549 He2 He II 1640 Mg2 Mg II 2799 N5 N V 1240 N2a [N II] 6548 N2b [N II] 6583 O1a [O I] 6300 O1b [O I] 6363 O2a [O II] 3725 O2b [O II] 3727 O3a [O III] 4363 O3b [O III] 4959 O3c [O III] 5007 S2a [S II] 6716 S2b [S II] 6730
If a line is missing or not measured, the z, etc. is 0 and the z_err, etc. is -1.
The specObjID and objID values are unique across all the SDSS databases, so these can be used to locate rows in the PhotoPrim.db and SpecPhoto.db tables as well.
To get the location of the actual spectrum corresponding to a row in the database, I've set up directories of the plates containing the multispec files. The plateID, mjd and fiberID values provide a path to the spectrum.
For example, if the plateID is "649", mjd is "52201" and fiberID = "320", the file is
/data/astrocat/SDSS-dr6/Spectro/spectro_DR1/0649/spPlate-0649-52201.fitsand spectrum 320 of that file is the target. See getspecid for a method of extracting the spectrum to your own directory.
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