Normalized quasar spectra with MgII absorber systems. Inset shows the convolved array. For more details, see Fig 1 in paper.
Redshift distribution of DR16 quasars and MgII absorbers.
For more details see Fig 3 in paper.
Observed and completeness corrected EW distribution of
MgII absorbers. For more details see Fig 8 in paper.
Here we make publicly available the MgII (Mg+) Absorber catalogue based on ~ 1 million quasar spectra from the final SDSS quasar sample (DR16), including all spectra observed through SDSS-IV. The automated absorption detection pipeline is fully described in Anand et al. 2021. There are ~ 160,000 MgII absorbers together with ~ 70,000 FeII (Fe+) confirmed systems in the catalogue. The completeness and purity both are very high for our catalogue. Also, the majority of absorbers have high S/N.
To see a short schematic of our absorber detection pipeline Click here
To have a quick look into the contents of the files copy this jupyter notebook.
If you're using these catalogues, please cite our paper Anand et al. 2021 [arXiv] [ADS]
Want a very quick look into the paper (without getting lost into the technical details 😄), see this MPA highlight or astrobites summary.
In case you have questions, please feel free to reach me at abhijeet [AT] mpa-garching [DOT] mpg [DOT] de
Thank you very much,
Abhijeet Anand
MPA, Garching
There are two catalogues:
- All MgII absorbers: This is the larger catalogue that includes all MgII absorbers that are detected by our pipeline. It contains ~160,000 absorbers.
Datafiles that contain this catalogue can be downloaded in HDF5 or FITS format. Below are the datafiles and description of the catalogue:
README file (available as .md, .html) that describes the catalogue is:
- FeII confirmed MgII absorbers: This is the smaller catalogue that includes only those MgII absorbers having confirmed FeII lines. There are ~70,000 systems in this catalogue.
Datafiles that contain this catalogue can be downloaded in HDF5 or FITS format. Below are the datafiles and description of the catalogue:
README file (available as .md, .html) that describes the catalogue is: