The Pitt SDSS MgII Catalog

This website allows users to access the data and results used to create the The Pittsburgh Sloan Digital Sky Survey Mg II Quasar Absorption-line Survey Catalog (Quider, A., Nestor, D., Turnshek, D., Rao, S., Monier, E., Weyant, A, and Busche, J. 2011, AJ, 141, 137).
Abstract:
We present a catalog of intervening MgII quasar absorption-line systems in the redshift interval 0.36 <= z <= 2.28. The catalog was built from Sloan Digital Sky Survey Data Release Four (SDSS DR4) quasar spectra. Currently, the catalog contains >17,000 measured MgII doublets. We also present data on the ~44,600 quasar spectra which were searched to construct the catalog, including redshift and magnitude information, continuum-normalized spectra, and corresponding arrays of redshift-dependent minimum rest equivalent widths detectable at our confidence threshold. The catalog is available on the web. A careful second search of 500 random spectra indicated that, for every 100 spectra searched, approximately one significant MgII system was accidently rejected. Current plans to expand the catalog beyond DR4 quasars are discussed. Many MgII absorbers are known to be associated with galaxies. Therefore, the combination of large size and well understood statistics make this catalog ideal for precision studies of the low-ionization and neutral gas regions associated with galaxies at low to moderate redshift. An analysis of the statistics of MgII absorbers using this catalog will be presented in a subsequent paper.
Available for download

(1) absorber catalog: This text file contains data on all the absorption systems identified. The data are arranged in columns. For an explanation of the contents please download the associated absorber catalog README file.

(2) searched quasar catalog: This text file contains data on all the searched quasars from DR4. The data are arranged in columns. For an explanation of the contents please download the associated quasar catalog README file.

(3) absorber spectra: This tarred and gzipped file (~715 Mbytes) contains all quasar spectra with an identified Mg II absorption system. Some spectra have more than one absorption system. For an explanation of the contents please download the associated spectra README file.

(4) non absorber spectra: This tarred and gzipped file (~1.4Gbytes) contains all quasar spectra in which Mg II absorption was NOT identified. When merged with file #3 above, these constitute all searched quasars from DR4. The format is the same as for file #3.


Viewing the Catalog Online

For those not interested in obtaining a copy of the data set, it may be convenient to look at the data and links we have put online in the RA-sorted Mg II absorber catalog table (below). If you click on a SDSS J2000 quasar link you will see two additional tables that give the properties of the quasar containing the absorber as well as absorption lines that were measured in the system. If you click on a MJD-plate-fiber link you will go to the SDSS DR7 website for the quasar.


Mg II Absorbers

SDSS J2000 Quasar
MJD-plate-fiber
z-em
z-abs
rew2796 (Å)
rew2796err (Å)
rew2803 (Å)
rew2803err (Å)
2.240
0.9640
2.649
0.103
1.904
0.101
1.844
1.3135
1.878
0.123
2.008
0.093
1.250
0.6933
0.547
0.071
0.498
0.082
2.122
1.0708
0.896
0.134
0.838
0.148
0.951
0.4964
0.455
0.071
0.348
0.067
2.640
1.0567
1.715
0.088
1.255
0.097
2.640
1.3815
0.841
0.062
0.735
0.067
1.320
0.4153
0.863
0.159
0.590
0.146
1.411
0.8979
1.986
0.162
1.776
0.162
1.895
1.0208
0.806
0.127
0.455
0.128
2.638
1.3281
0.704
0.089
0.816
0.109
2.638
1.5993
1.369
0.113
1.252
0.158
2.308
1.3319
1.071
0.146
0.690
0.200
1.824
0.9328
0.591
0.069
0.437
0.078
1.824
1.1732
1.257
0.089
1.154
0.092
1.824
1.4358
1.385
0.091
0.964
0.109
1.353
0.9554
1.151
0.091
0.992
0.063
1.239
0.6374
0.693
0.113
0.582
0.103
2.433
1.9132
1.445
0.098
1.261
0.119
0.507
0.4123
1.418
0.386
1.303
0.362
1.295
0.5364
0.804
0.113
0.529
0.113
1.067
0.4241
1.011
0.159
1.400
0.163
1.190
0.5065
0.753
0.080
0.366
0.073
2.326
1.0272
1.004
0.174
0.914
0.172
1.129
0.6258
2.336
0.180
1.340
0.155
1.758
1.3004
1.162
0.067
1.044
0.065
1.392
1.2586
0.586
0.061
0.361
0.058
1.392
1.3182
0.441
0.052
0.339
0.062
1.725
1.0938
1.258
0.111
0.728
0.100
1.725
1.1317
1.432
0.092
1.342
0.098
1.725
1.4075
0.608
0.054
0.554
0.061
1.400
1.0434
1.183
0.224
0.962
0.207
0.888
0.6541
0.457
0.052
0.209
0.053
2.064
1.3176
1.804
0.109
1.678
0.113
1.264
0.4005
2.210
0.291
1.590
0.216
1.264
0.6744
0.821
0.092
0.562
0.088
1.240
1.0450
1.968
0.103
1.480
0.103
2.459
1.4193
0.508
0.087
0.596
0.085
1.478
1.2176
0.716
0.089
0.967
0.087
0.757
0.7161
0.673
0.092
0.424
0.071
1.950
1.7679
2.609
0.070
3.304
0.123
1.358
0.6721
1.079
0.094
0.845
0.100
1.445
0.9403
3.058
0.230
1.396
0.187
1.244
0.8634
1.159
0.093
0.966
0.094
1.935
1.4142
1.441
0.153
0.992
0.160
2.070
1.4556
0.837
0.126
0.873
0.084
3.151
1.6453
1.680
0.183
1.202
0.129
1.819
1.0959
3.904
0.242
2.937
0.233
1.818
1.6871
2.543
0.105
2.552
0.236
0.901
0.7356
1.327
0.149
1.100
0.134
0.901
0.8163
0.759
0.132
0.889
0.163
3.152
0.9572
2.441
0.119
2.143
0.118
3.152
1.9665
3.079
0.487
2.778
0.192
2.847
1.8861
2.210
0.240
1.708
0.213
1.746
0.8920
0.816
0.046
0.671
0.050
1.274
0.8196
1.322
0.075
1.162
0.074
1.196
0.5478
0.436
0.080
0.256
0.050
1.858
1.3985
1.648
0.076
1.288
0.068
1.464
1.1512
1.803
0.092
1.803
0.087
2.153
0.6572
1.494
0.163
1.060
0.204
2.165
1.2119
0.713
0.085
0.399
0.086
2.210
1.1831
0.685
0.076
0.622
0.087
2.210
1.5022
1.610
0.091
1.148
0.089
1.844
0.8588
1.178
0.193
1.171
0.191
1.541
0.4838
2.689
0.145
2.565
0.155
1.933
0.6363
0.668
0.097
0.372
0.109
2.167
0.8416
0.930
0.098
0.641
0.088
1.767
0.5404
1.626
0.290
1.077
0.280
1.767
1.2931
4.038
0.149
3.947
0.145
1.177
1.0346
1.939
0.231
1.765
0.187
1.816
1.6332
0.528
0.083
0.483
0.066
1.551
1.1804
0.959
0.047
0.668
0.046
1.551
1.3706
0.298
0.034
0.192
0.035
1.923
0.6565
2.016
0.167
2.030
0.170
1.923
0.8338
2.241
0.155
2.217
0.167
1.923
1.0524
2.424
0.168
1.434
0.192
2.852
1.3497
0.715
0.112
0.768
0.105
3.211
1.1240
1.435
0.112
1.055
0.127
2.060
1.5395
0.950
0.115
0.786
0.116
2.000
1.0575
2.358
0.179
1.283
0.169
1.359
0.8860
1.848
0.159
2.146
0.163
1.402
0.5492
1.410
0.204
0.645
0.210
1.796
1.6037
1.991
0.461
1.914
0.255
2.444
1.6204
1.884
0.123
2.272
0.253
0.819
0.4816
1.056
0.136
0.971
0.135
0.819
0.5297
0.762
0.105
0.592
0.111
1.808
1.0011
1.270
0.047
1.017
0.045
1.431
0.7548
0.869
0.131
0.839
0.173
1.806
1.5053
0.990
0.088
0.731
0.075
1.465
0.6912
0.752
0.115
0.601
0.115
1.012
0.7714
0.818
0.086
0.825
0.074
1.858
0.4577
1.464
0.216
1.588
0.250
1.858
1.3818
0.777
0.105
0.710
0.111
0.756
0.5838
1.412
0.063
0.996
0.061
1.688
1.3675
0.400
0.060
0.436
0.072
1.571
0.7902
0.955
0.200
0.770
0.157
1.571
1.0300
1.989
0.250
1.247
0.226
1.673
1.2460
1.468
0.136
1.258
0.138
1.518
0.7950
1.050
0.093
0.914
0.093
1.518
1.3451
3.015
0.091
2.693
0.086
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