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.edu
The 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.fits
and spectrum 320 of that file is the target. See
getspecid for a method of extracting the
spectrum to your own directory.
[Introduction]
[Photometric Data]
[Spectral Data]
[Spectral Line Data]
[Tools & Examples]
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