Lyman limit systems in large quasar surveys J/MNRAS/498/1951 ivo://CDS.VizieR/J/MNRAS/498/1951 doi:10.26093/cds/vizier.74981951 CDS Fumagalli M. Fotopoulou S. Thomson L. 2024-08-21T20:15:53Z 2023-11-03T09:54:37Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr quasars redshifted intergalactic-medium visible-astronomy spectroscopy We present a pipeline based on a random forest classifier for the identification of high column density clouds of neutral hydrogen (i.e. the Lyman limit systems, LLSs) in absorption within large spectroscopic surveys of z>~3 quasars. We test the performance of this method on mock quasar spectra that reproduce the expected data quality of the Dark Energy Spectroscopic Instrument and the WHT (William Herschel Telescope) Enhanced Area Velocity Explorer surveys, finding >~90 per cent completeness and purity for N_HI_>~10^17.2^cm^-2^ LLSs against quasars of g<23mag at z~3.5-3.7. After training and applying our method on 10000 quasar spectra at z~3.5-4.0 from the Sloan Digital Sky Survey (Data Release 16), we identify ~6600 LLSs with N_HI_>~10^17.5^cm^-2^ between z~3.1 and 4.0 with a completeness and purity of >~90 per cent for the classification of LLSs. Using this sample, we measure a number of LLSs per unit redshift of l(z)=2.32+/-0.08 at z=[3.3,3.6]. We also present results on the performance of random forest for the measurement of the LLS redshifts and HI column densities, and for the identification of broad absorption line quasars. 2020MNRAS.498.1951F https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/498/1951 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to VII/289 : SDSS quasar catalog, sixteenth data release (DR16Q) (Lyke+, 2020) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/498/1951 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/498/1951 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/498/1951 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/498/1951 https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/498/1951 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/498/1951 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/MNRAS/498/1951/table1 (Final classification for the full sample) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/498/1951/table1? https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/498/1951/table1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/498/1951/table1? 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18804 18807-18808 18812-18814 18821 18825-18827 18830-18831 18833 18835 18841-18846 18852 18855 18857 18859-18860 18865-18866 18868-18869 18878 18881-18882 18885 18887-18888 18890 18899 18901 18906-18907 18910-18911 18916-18917 18924-18925 18927 18932-18933 18935 18939-18940 18942-18943 18993 18997 19003 19005-19006 19012 19020-19021 19023 19025-19026 19029-19032 19034 19036-19038 19043-19045 19048-19050 19056-19057 19059-19062 19069 19075 19080 19083 19085-19087 19089-19090 19092-19093 19095 19100-19102 19107 19116 19118 19120-19122 19131 19135 19138 19143 19150-19151 19153 19161 19166 19168-19169 19172-19174 19177 19179 19181-19182 19189 19192 19196-19197 19199-19200 19202 19204 19207 19212-19213 19215 19217-19218 19220 19225-19226 19228-19229 19236 19239 19244-19245 19256 19258-19259 19261 19264 19267 19270 19273 19276-19277 19279-19281 19283 19285 19304-19306 19309-19310 19313 19315-19316 19318 19327 19332 19336-19338 19345 19347 19353 19356 19372 19376 19383 19386 19389-19390 19395-19396 19403 19405 19407 19411 19417-19420 19422 19424-19425 19427 19431-19432 19437 19445 19456-19458 19461-19462 19464-19465 19469 19471-19472 19474 19476 19478 19485-19486 19488-19489 19491 19493-19494 19499-19502 19505 19507 19511-19512 19515-19517 19522-19524 19527-19528 19531 19534 19536 19542 19547 19549 19551 19560-19562 19568-19569 19571 19573 19579 19587 19589 19593 19597 19599 19602-19604 19606 19608 19610 19612 19614 19616-19618 19620 19622 19625 19630-19632 19634-19637 19640-19641 19645-19647 19651 19654 19657 19661-19665 19668-19669 19671-19672 19680 19682-19683 19687-19688 19691-19692 19695 19697-19698 19700-19701 19703 19709-19710 19712-19714 19720 19730 19735 19742-19743 19746 19749-19750 19752 19754-19756 19759 19761-19762 19764 19766-19767 19769-19773 19775-19776 19780 19782 19785 19787-19790 19792 19798 19802-19803 19805-19806 19812 19815 19819-19820 19825 19829 19831 19834 19836 19838 19841-19843 19847-19848 19850 19852-19854 19857-19858 19861 19867 19872 19874 19876 19878-19879 19881-19882 19884 19888 19890 19894 19901-19902 19904-19905 19908-19909 19911-19912 19915-19917 19921-19922 19928 19932 19935-19937 19939 19941-19942 19945 19947 19951 19954-19955 19965-19966 19972 19975 19977-19978 19981 19983 19987 19993 19996-19997 20002 20004 20008 20014 20016 20021-20023 20026-20027 20030-20031 20034 20037-20038 20041 20043-20044 20047-20048 20050 20058 20063-20064 20066 20068-20070 20072 20074 20078-20079 20083-20084 20092 20094-20096 20098 20101 20104-20105 20108 20112 20114-20115 20117 20119 20123 20125-20126 20129 20136-20137 20141 20145 20147 20149 20152 20155-20157 20165-20167 20172 20176-20178 20181 20194-20195 20201 20203 20207-20208 20212 20215 20220 20223 20228 20230 20232-20233 20239-20240 20242-20243 20245 20247 20249-20250 20254-20256 20258 20262-20263 20265-20266 20270 20273 20276 20278 20280 20283 20293-20298 20301 20309 20312-20313 20316 20319-20320 20322-20324 20327 20332 20335-20337 20343-20344 20347 20349 20352-20353 20355-20356 20358 20361-20363 20368 20370 20372-20374 20376-20377 20381 20386 20388-20389 20391 20394 20396 20398 20406 20414-20416 20418-20419 20424 20426 20431-20432 20435 20452 20454 21846 21849-21850 21852-21853 21869 21877-21879 21885 21909 21959 21965 21967 21972-21973 21976-21977 21982-21983 21991 22003-22004 22006-22007 22010 22355 22361 22363-22364 22385-22386 22388 22390 22396 22485-22487 22494 22525 25587 25595-25597 25821 25843 25845-25847 25849 25851 25853-25855 25887 25902 25908-25909 25917-25918 25928-25929 25931-25932 25937 25943-25945 25947 25949-25950 25954-25955 25958 25964 25966-25967 25972-25973 25976 25979-25981 25987 25990-25991 25995 25998 26000 26005-26006 26010-26012 26014-26015 26018-26019 26022-26023 26025-26027 26029 26032 26034-26036 26038-26040 26047 26052 26062 26064 26069-26071 26074-26075 26078 26080 26082 26089-26090 26094-26096 26099-26100 26102 26107-26110 26164 26166-26167 26169 26171-26172 26174 26180 26188-26189 26191 26197-26199 26201-26203 26208-26209 26212 26217 26220 26222 26226-26228 26231 26233 26245 26248-26249 26261 26264 26266-26268 26270 26273-26274 26276-26278 26282-26283 26287 26292-26294 26296 26298 26300-26301 26306 26310-26311 26317 26327 26329-26330 26335-26337 26347-26350 26352-26353 26355-26356 26363 26366 26368-26369 26375-26376 26380 26382-26384 26387 26389 26400 26409 26413-26417 26420-26421 26423 26426 26431 26441-26442 26445 26448-26449 26454-26455 26457 26460 26466 26468-26469 26476 26480 26484 26489 26492 26494-26495 26498 26501 26509 26514 26520 26524 26526 26528 26530 26535 26537 26540-26542 26544 26554 26557-26559 26564 26568-26569 26574-26575 26577 26581-26583 26588-26589 26592 26594 26596 26598-26599 26602-26603 26605 26607-26608 26610 26612-26614 26618 26622 26863 26867 26869 26871 26873 26876 26878 26936 26939 26941 26943 26947 26950 26953 26958 26960 26968-26970 26974 26976 26981 26987 26990 26993 26996 27005-27006 27013 27015-27016 27019 27021-27022 27024-27025 27028 27031 27033-27035 27037-27038 27040 27043 27049 27052 27056-27057 27064-27066 27072 27074 27077-27078 27082 27085 27087 27098-27099 27105-27108 27112 27115-27116 27118 27121 27123 27125 27130 27132 27134-27135 27167 27189 27191 27203 27207 27209-27212 27214 27217 27220-27221 27223 27228 27231 27234 27236 27238-27239 27246 27248 27251 27257 27263 27269 27274 27276 27278 27280 27283 27286 27290 27292 27294 27297 27303 27305-27308 27311 27313-27314 27316-27317 27320 27322 27324 27326-27330 27332-27333 27337 27339 27342-27343 27348 27359 27361-27362 27365-27366 27371-27372 27374 27376 27379-27380 27386 27388 27391 27400 27403-27404 27406 27410-27411 27413-27415 27417 27420-27421 27423 27427-27428 27436 27439 27446 27449-27451 27456 27458-27459 27463-27466 27469 27471 27481 27484-27485 27491 27493-27498 27506 27508 27511 27514 27517-27519 27521 27523-27525 27527 27531-27532 27535 27537 27539 27546-27547 27549-27550 27555 27557-27560 27567 27569-27571 27575-27577 27581-27582 27584-27586 27589-27591 27593-27594 27596-27597 27599-27600 27604 27607-27608 27611-27613 27615-27616 27619 27621 27630-27631 27638 27642-27643 27646-27647 27649 27652 27654 27659 27661-27662 27665-27666 27668 27674-27677 27681 27684 27691 27698 27701 27703 27706 27721 27724 27726-27727 27732 27735 27737 27740 27742 27748 27750 27752 27754 27760 27767 27773 27777-27778 27781-27783 27785 27787 27789-27790 27794 27797-27800 27804-27805 27807-27809 27816-27817 27824 27828 27830-27831 27835-27836 27838 27844 27846 27848 27851 27854-27858 27862 27868-27870 27879-27882 27886-27887 27896 27898 27901-27902 27905 27910 27917 27920 27923 27927 27935 27937 27941-27942 27945 27947 27951 27953 27955 27957-27958 27963 27968-27969 27972-27973 27976 27981-27983 27985 27989-27991 27993 27997-27998 28001 28003 28009 28011-28014 28016 28022-28025 28028-28029 28033 28037 28042-28044 28050 28053-28054 28058 28060 28062 28067-28069 28071 28073-28074 28077-28078 28081-28082 28087-28088 28090-28091 28093 28095 28097 28102-28103 28107-28109 28112 28115-28116 28118-28119 28127 28129 28131 28136 28139-28142 28144 28147-28150 28152-28154 28156-28157 28160 28162 28165-28166 28170-28171 28173 28177 28181-28185 28194-28195 28197 28200 28203 28205 28210 28212-28213 28215 28217-28218 28220 28225-28226 28228 28231-28232 28235 28239-28240 28244 28248-28249 28252 28255 28258 28260-28261 28263 28265 28269 28271-28272 28280 28283-28284 28286 28290-28291 28293-28296 28307-28309 28315 28318-28320 28323 28325 28327 28329 28331-28334 28337-28338 28341 28344 28349 28354-28356 28358 28362 28368-28369 28372 28376-28377 28379 28383 28385-28386 28389 28391 28394-28395 28400 28403 28405-28407 28409-28412 28415-28418 28420-28421 28423 28427 28430 28434 28436-28437 28441 28444-28446 28448 28455-28456 28459 28464 28466-28468 28470-28471 28474-28475 28482-28483 28489 28493-28495 28499-28500 28506-28507 28509 28519 28521 28524 28528 28532-28533 28539 28543-28545 28551 28553 28556-28558 28560 28563-28566 28570 28573-28575 28579 28581-28582 28586 28592-28593 28595 28599 28601-28602 28605-28609 28611 28616-28617 28621-28622 28626-28627 28629-28630 28637 28639 28641-28643 28646-28647 28651-28654 28656 28658 28660 28663-28664 28667 28671 31338 31355 31373 31378 31383-31385 31387 31389 31391 31398-31399 31403 31413 31417 31423 31427 31431-31432 31434 31437 31439 31441 31443-31444 31460-31462 31466 31468 31470 31473-31474 31478 31481 31483 31528 31535 31599 31617 31622 31628 31631 31634-31635 31641 31644 31648 31655-31657 31659-31661 31666 31670 31675-31677 31690 31694 31699 31708 31714 31716-31717 31719 31721-31722 31726 31730-31732 31734 31738 31740-31741 31743 32390 32393 32396 32408 32410-32412 32414-32416 32418 32420 32422 32429 32431 32437-32438 32441 32444 32456 32460 32462 32480 32482 32488 32490 32495 32497-32498 32502 32505 32509 32680-32682 32686 36766 36773 36778 36781 36783 36786 36788 36791 36796 36809-36811 36814 36835 36840 36842 36844 36846 36850 36859 40950 40958 45039 45048-45049 45052 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/498/1951?format=ascii Optical default J/MNRAS/498/1951/table1 Final classification for the full sample SimbadName Simbad column added by the CDS meta.id char nullable recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Name Quasar name in the SDSS convention (spec-Plate-MJD-Fiber) meta.id;meta.main char RAJ2000 Right ascension (J2000) deg pos.eq.ra;meta.main DEJ2000 Declination (J2000) deg pos.eq.dec;meta.main z Quasar redshift from the SDSS pipeline src.redshift float S/N Signal to noise ratio measured at 1150{AA} in the quasar rest-frame stat.snr float Primary [Y/N] Flag indicating if the quasar is a "Science Primary" observation meta.code char Train [Y/N] Flag indicating if the quasar is included in the training set meta.code char Class Flag describing the outcome of the classification (1) meta.code.class int zLLS Measured redshift of the Lyman limit system (LLS) src.redshift;pos.heliocentric float Sp Interactive spectrum from SDSS-DR16 meta.ref.url char