On this page, you'll find links for several
DLA catalogues based on SDSS-II and SDSS-III/BOSS.
Note that within a survey
(SDSS-II or SDSS-III), data releases are inclusive of previous ones.
For more
details, please visit the sdss and sdss3 webpages.
SDSS-III DR10:
This
catalogue is not published (so please cite both DR7 & DR9 DLA
papers above if you are going to use it). It is basically an update of
the DR9
catalogue using the DR10 QSO catalogue (Pâris et al. 2013). IMPORTANT NOTE: The
BOSS DLA catalogue was created for multiple science purposes and hence
designed to be as large as possible with minimal cuts on data quality
(signal to noise ratio can be very low!) and robustness of DLA detection.
I provide here the raw output of the
automatic
routine without any cut nor eye-checking. This means that a significant
fraction of systems are likely false positive (systems with low N(HI)
and in low SNR spectra being the
most numerous), and DLAs considered as candidates. Depending on your science
purpose, you should make further cuts. Data quality (CNR) and detection
parameters (cc, Pcc, saap, flux/error in core) are provided for this purpose (as general
rule, the
higher the cc and the lower the Pcc and saap, the more robust the
detection). Here are some known caveats: (i) at z>3.5 the identification of DLAs in SDSS spectra
becomes very uncertain because of strong blending of denser Ly-alpha
forest. (ii) OVI
or Ly-beta absorption can be mistaken as DLA, even if QSO is not a
strong BAL. (iii) although the code was designed to search for
intevening systems, it has also been applied (after popular demand) to v<5000
km/s from the QSO, where the N(HI) measurement becomes difficult due to
the Ly-alpha emission. The corresponding candidates are still provided,
but you are
invited to look at the corresponding figure to judge identification by
yourself and look at possible metal lines. Do not hesitate to contact
me for advices on cuts to apply depending on your objectives. Any
feedback is appreciated.
The full ascii table can be found here. The figures are in a tar file here.
Alternatively, I also provide a reduced html version of the catalogue: this
allows you to quickly sort/search in columns, go directly to the
object's details on the SDSS explorer (from which you can get the
spectra, images,
photometry, finding charts or so) and obtain a postcript figure for
each absorber showing the detection, zabs and NHI measurement as well
as equivalent widths of
associated metals. For the moment being, the operations are on the
client-side, which
means the table may take some time (minutes) to load before you can play with it
(depending on your internet connection, machine and web browser). This table is here.