J/AJ/140/390ivo://CDS.VizieR/J/AJ/140/390doi:10.26093/cds/vizier.51400390CDSBoroson T.A.Lauer T.R.2017-07-03T14:25:33Z2012-08-22T12:07:21ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frquasarsspectroscopyastronomical-modelsThe Karhunen-Loeve (KL) transform can compactly represent the information contained in large, complex datasets, cleanly eliminating noise from the data and identifying elements of the dataset with extreme or inconsistent characteristics. We develop techniques to apply the KL transform to the 4000-5700{AA} region of 9800 QSO spectra with z<0.619 from the SDSS archive. Up to 200 eigenspectra are needed to fully reconstruct the spectra in this sample to the limit of their signal-to-noise (S/N). We propose a simple formula for selecting the optimum number of eigenspectra to use to reconstruct any given spectrum, based on the S/N of the spectrum, but validated by formal cross-validation tests.2010AJ....140..390Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/140/390CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/140/390https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/140/390http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/140/390https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/140/390https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/140/390http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/140/390GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/140/390/table2 (Reconstruction weights for the QSO Sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/140/390/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/140/390/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/140/390/table2?GETtext/xml+votable180.050000true0.047541714.92933330.0055555555555555564/355 451 704 739 1692 5/1024 1026 1027 1030 1038 1042 1044 1051 1052 1057 1058 1059 1088 1179 1182 1185 1187 1188 1190 1193 1197 1204 1205 1209 1228 1233 1235 1238 1241 1246 1250 1252 1254 1258 1260 1272 1274 1277 1279 1311 1322 1326 1329 1335 1337 1338 1342 1343 1349 1351 1354 1359 1360 1363 1366 1367 1368 1371 1374 1376 1380 1383 1390 1391 1392 1400 1411 1413 1414 1418 1429 1432 1433 1434 1436 1438 1439 1441 1443 1446 1447 1448 1450 1453 1454 1456 1462 1463 1466 1469 1473 1478 1480 1482 1483 1488 1498 1501 1502 1508 1509 1511 1516 1523 1525 1529 1530 1532 1558 1561 1564 1599 1611 1614 1615 1617 1618 1623 1624 1627 1628 1630 1634 1635 1641 1647 1648 1651 1654 1658 1660 1793 1794 1795 1798 1799 1800 1801 1810 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28201 28202 28209 28210 28224 28225 28509 28510 28529 28532 28533 28534 28538 28539 28540 28541 28543 28571 28573 28574 28575 28588 28589 28591 28593 28595 28602 28603 28606 28607 28610 28611 28615 28616 28617 28619 28620 28621 28623 28628 28629 28631 28632 28633 28635 28636 28638 28640 28642 28643 28648 28649 28651 28652 28654 28655 28656 28657 28659 28660 28661 28663 28664 28666 28667 28669 28670 28671 29973 30029 30031 30033 30034 30035 30044 30046 30053 30064 30066 31138 31289 31291 31292 31293 31294 31313 31314 31315 31316 31318 31319 31321 31322 31323 31324 31329 31330 31331 31332 31333 31336 31337 31339 31341 31344 31345 31353 31354 31355 31367 31369 31371 31372 31373 31375 31376 31377 31379 31384 31385 31389 31390 31392 31393 31396 31397 31398 31402 31403 31405 31407 31408 31410 31420 31421 31422 31424 31425 31429 31430 31431 31434 31435 31436 31437 31438 31440 31441 31446 31451 31456 31457 31458 31473 31477 31485 31488 31533 31535 31546 31547 31618 31620 31622 31623 31626 31627 31629 31630 31631 31632 31634 31648 31649 31651 31652 31654 31656 31657 31696 31698 32399 32403 32406 32408 32409 32410 32413 32414 32415 32421 32432 32433 32435 32438 32439 32444 32445 32446 32456 32458 32459 32460 32478 32480 32484 32489 32490 32491 32492 32494 32497 32500 32501 32503 32508 32510 32511 32672 32674 36703 36719 36725 36726 36727 36732 36733 36734 36759 36763 36765 36766 36767 36775 36777 36778 36779 36785 36786 36787 36788 36789 36790 36792 36793 36801 36802 36803 36804 36806 36807 36808 36810 36816 36861 36862 36863 45044 45046 45050 45051 48990 49007 49009 49010 49013 49014 49017 49018 49019 49020 49022 49077 49079 49084 49087 49091 49092 49094 49096 49098 49099 49100 49101 49104 49105 49106 49121 49124 49149 49151https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/140/390?format=asciiOpticaldefaultJ/AJ/140/390/table2Reconstruction weights for the QSO Samplea90? Weight for eigenspectrum 90stat.fit.paramfloatnullablea91? Weight for eigenspectrum 91stat.fit.paramfloatnullablea92? Weight for eigenspectrum 92stat.fit.paramfloatnullablea93? Weight for eigenspectrum 93stat.fit.paramfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCaseSimbad column added by the CDSsrc.classcharSloanDisplay the SDSS data for this quasarmeta.ref.urlcharSDSSSDSS identification (HHMMSS.ss+DDMMSS.s)meta.id;meta.maincharQ7Details from the SDSS-DR7 quasar catalog (Schneider+, 2010, Cat. VII/260)meta.ref.urlcharzRedshiftsrc.redshiftfloatNormNormalization to units of 10^-17^erg/s/cm^2^/{AA}stat.fit.paramdoubleNumNumber of eigenspectra to be usedmeta.numberintChi2Reduced {chi}-squared cross-validation valuestat.valuefloata1Weight for eigenspectrum 1stat.fit.paramfloata2Weight for eigenspectrum 2stat.fit.paramfloata3Weight for eigenspectrum 3stat.fit.paramfloata4Weight for eigenspectrum 4stat.fit.paramfloata5Weight for eigenspectrum 5stat.fit.paramfloata6Weight for eigenspectrum 6stat.fit.paramfloata7Weight for eigenspectrum 7stat.fit.paramfloata8Weight for eigenspectrum 8stat.fit.paramfloata9Weight for eigenspectrum 9stat.fit.paramfloata10Weight for eigenspectrum 10stat.fit.paramfloata11Weight for eigenspectrum 11stat.fit.paramfloata12Weight for eigenspectrum 12stat.fit.paramfloata13Weight for eigenspectrum 13stat.fit.paramfloata14Weight for eigenspectrum 14stat.fit.paramfloata15Weight for eigenspectrum 15stat.fit.paramfloata16Weight for eigenspectrum 16stat.fit.paramfloata17Weight for eigenspectrum 17stat.fit.paramfloata18Weight for eigenspectrum 18stat.fit.paramfloata19Weight for eigenspectrum 19stat.fit.paramfloata20Weight for eigenspectrum 20stat.fit.paramfloata21Weight for eigenspectrum 21stat.fit.paramfloata22Weight for eigenspectrum 22stat.fit.paramfloata23Weight for eigenspectrum 23stat.fit.paramfloata24Weight for eigenspectrum 24stat.fit.paramfloata25Weight for eigenspectrum 25stat.fit.paramfloata26Weight for eigenspectrum 26stat.fit.paramfloata27Weight for eigenspectrum 27stat.fit.paramfloata28Weight for eigenspectrum 28stat.fit.paramfloata29Weight for eigenspectrum 29stat.fit.paramfloata30Weight for eigenspectrum 30stat.fit.paramfloata31Weight for eigenspectrum 31stat.fit.paramfloata32Weight for eigenspectrum 32stat.fit.paramfloata33? Weight for eigenspectrum 33stat.fit.paramfloatnullablea34? Weight for eigenspectrum 34stat.fit.paramfloatnullablea35? Weight for eigenspectrum 35stat.fit.paramfloatnullablea36? Weight for eigenspectrum 36stat.fit.paramfloatnullablea37? Weight for eigenspectrum 37stat.fit.paramfloatnullablea38? Weight for eigenspectrum 38stat.fit.paramfloatnullablea39? Weight for eigenspectrum 39stat.fit.paramfloatnullablea40? Weight for eigenspectrum 40stat.fit.paramfloatnullablea41? Weight for eigenspectrum 41stat.fit.paramfloatnullablea42? Weight for eigenspectrum 42stat.fit.paramfloatnullablea43? Weight for eigenspectrum 43stat.fit.paramfloatnullablea44? Weight for eigenspectrum 44stat.fit.paramfloatnullablea45? Weight for eigenspectrum 45stat.fit.paramfloatnullablea46? Weight for eigenspectrum 46stat.fit.paramfloatnullablea47? Weight for eigenspectrum 47stat.fit.paramfloatnullablea48? Weight for eigenspectrum 48stat.fit.paramfloatnullablea49? Weight for eigenspectrum 49stat.fit.paramfloatnullablea50? Weight for eigenspectrum 50stat.fit.paramfloatnullablea51? Weight for eigenspectrum 51stat.fit.paramfloatnullablea52? Weight for eigenspectrum 52stat.fit.paramfloatnullablea53? Weight for eigenspectrum 53stat.fit.paramfloatnullablea54? Weight for eigenspectrum 54stat.fit.paramfloatnullablea55? Weight for eigenspectrum 55stat.fit.paramfloatnullablea56? Weight for eigenspectrum 56stat.fit.paramfloatnullablea57? Weight for eigenspectrum 57stat.fit.paramfloatnullablea58? Weight for eigenspectrum 58stat.fit.paramfloatnullablea59? Weight for eigenspectrum 59stat.fit.paramfloatnullablea60? Weight for eigenspectrum 60stat.fit.paramfloatnullablea61? Weight for eigenspectrum 61stat.fit.paramfloatnullablea62? Weight for eigenspectrum 62stat.fit.paramfloatnullablea63? Weight for eigenspectrum 63stat.fit.paramfloatnullablea64? Weight for eigenspectrum 64stat.fit.paramfloatnullablea65? Weight for eigenspectrum 65stat.fit.paramfloatnullablea66? Weight for eigenspectrum 66stat.fit.paramfloatnullablea67? Weight for eigenspectrum 67stat.fit.paramfloatnullablea68? Weight for eigenspectrum 68stat.fit.paramfloatnullablea69? Weight for eigenspectrum 69stat.fit.paramfloatnullablea70? Weight for eigenspectrum 70stat.fit.paramfloatnullablea71? Weight for eigenspectrum 71stat.fit.paramfloatnullablea72? Weight for eigenspectrum 72stat.fit.paramfloatnullablea73? Weight for eigenspectrum 73stat.fit.paramfloatnullablea74? Weight for eigenspectrum 74stat.fit.paramfloatnullablea75? Weight for eigenspectrum 75stat.fit.paramfloatnullablea76? Weight for eigenspectrum 76stat.fit.paramfloatnullablea77? Weight for eigenspectrum 77stat.fit.paramfloatnullablea78? Weight for eigenspectrum 78stat.fit.paramfloatnullablea79? Weight for eigenspectrum 79stat.fit.paramfloatnullablea80? Weight for eigenspectrum 80stat.fit.paramfloatnullablea81? Weight for eigenspectrum 81stat.fit.paramfloatnullablea82? Weight for eigenspectrum 82stat.fit.paramfloatnullablea83? Weight for eigenspectrum 83stat.fit.paramfloatnullablea84? Weight for eigenspectrum 84stat.fit.paramfloatnullablea85? Weight for eigenspectrum 85stat.fit.paramfloatnullablea86? Weight for eigenspectrum 86stat.fit.paramfloatnullablea87? Weight for eigenspectrum 87stat.fit.paramfloatnullablea88? Weight for eigenspectrum 88stat.fit.paramfloatnullablea89? Weight for eigenspectrum 89stat.fit.paramfloatnullablea94? Weight for eigenspectrum 94stat.fit.paramfloatnullablea95? Weight for eigenspectrum 95stat.fit.paramfloatnullablea96? Weight for eigenspectrum 96stat.fit.paramfloatnullablea97? Weight for eigenspectrum 97stat.fit.paramfloatnullablea98? Weight for eigenspectrum 98stat.fit.paramfloatnullablea99? Weight for eigenspectrum 99stat.fit.paramfloatnullablea100? Weight for eigenspectrum 100stat.fit.paramfloatnullablea101? Weight for eigenspectrum 101stat.fit.paramfloatnullablea102? Weight for eigenspectrum 102stat.fit.paramfloatnullablea103? Weight for eigenspectrum 103stat.fit.paramfloatnullablea104? Weight for eigenspectrum 104stat.fit.paramfloatnullablea105? Weight for eigenspectrum 105stat.fit.paramfloatnullablea106? Weight for eigenspectrum 106stat.fit.paramfloatnullablea107? Weight for eigenspectrum 107stat.fit.paramfloatnullablea108? Weight for eigenspectrum 108stat.fit.paramfloatnullablea109? Weight for eigenspectrum 109stat.fit.paramfloatnullablea110? Weight for eigenspectrum 110stat.fit.paramfloatnullablea111? Weight for eigenspectrum 111stat.fit.paramfloatnullablea112? Weight for eigenspectrum 112stat.fit.paramfloatnullablea113? Weight for eigenspectrum 113stat.fit.paramfloatnullablea114? Weight for eigenspectrum 114stat.fit.paramfloatnullablea115? Weight for eigenspectrum 115stat.fit.paramfloatnullablea116? Weight for eigenspectrum 116stat.fit.paramfloatnullablea117? Weight for eigenspectrum 117stat.fit.paramfloatnullablea118? Weight for eigenspectrum 118stat.fit.paramfloatnullablea119? Weight for eigenspectrum 119stat.fit.paramfloatnullablea120? Weight for eigenspectrum 120stat.fit.paramfloatnullablea121? Weight for eigenspectrum 121stat.fit.paramfloatnullablea122? Weight for eigenspectrum 122stat.fit.paramfloatnullablea123? Weight for eigenspectrum 123stat.fit.paramfloatnullablea124? Weight for eigenspectrum 124stat.fit.paramfloatnullablea125? Weight for eigenspectrum 125stat.fit.paramfloatnullablea126? Weight for eigenspectrum 126stat.fit.paramfloatnullablea127? Weight for eigenspectrum 127stat.fit.paramfloatnullablea128? Weight for eigenspectrum 128stat.fit.paramfloatnullablea129? Weight for eigenspectrum 129stat.fit.paramfloatnullablea130? Weight for eigenspectrum 130stat.fit.paramfloatnullablea131? Weight for eigenspectrum 131stat.fit.paramfloatnullablea132? Weight for eigenspectrum 132stat.fit.paramfloatnullablea133? Weight for eigenspectrum 133stat.fit.paramfloatnullablea134? Weight for eigenspectrum 134stat.fit.paramfloatnullablea135? Weight for eigenspectrum 135stat.fit.paramfloatnullablea136? Weight for eigenspectrum 136stat.fit.paramfloatnullablea137? Weight for eigenspectrum 137stat.fit.paramfloatnullablea138? Weight for eigenspectrum 138stat.fit.paramfloatnullablea139? Weight for eigenspectrum 139stat.fit.paramfloatnullablea140? Weight for eigenspectrum 140stat.fit.paramfloatnullablea141? Weight for eigenspectrum 141stat.fit.paramfloatnullablea142? Weight for eigenspectrum 142stat.fit.paramfloatnullablea143? Weight for eigenspectrum 143stat.fit.paramfloatnullablea144? Weight for eigenspectrum 144stat.fit.paramfloatnullablea145? Weight for eigenspectrum 145stat.fit.paramfloatnullablea146? Weight for eigenspectrum 146stat.fit.paramfloatnullablea147? Weight for eigenspectrum 147stat.fit.paramfloatnullablea148? Weight for eigenspectrum 148stat.fit.paramfloatnullablea149? Weight for eigenspectrum 149stat.fit.paramfloatnullablea150? Weight for eigenspectrum 150stat.fit.paramfloatnullablea151? Weight for eigenspectrum 151stat.fit.paramfloatnullablea152? Weight for eigenspectrum 152stat.fit.paramfloatnullablea153? Weight for eigenspectrum 153stat.fit.paramfloatnullablea154? Weight for eigenspectrum 154stat.fit.paramfloatnullablea155? Weight for eigenspectrum 155stat.fit.paramfloatnullablea156? Weight for eigenspectrum 156stat.fit.paramfloatnullablea157? Weight for eigenspectrum 157stat.fit.paramfloatnullablea158? Weight for eigenspectrum 158stat.fit.paramfloatnullablea159? Weight for eigenspectrum 159stat.fit.paramfloatnullable_RAPosition from name (right ascension part)degpos.eq.ra;meta.main_DEPosition from name (declination part)degpos.eq.dec;meta.main