J/ApJS/208/7ivo://CDS.VizieR/J/ApJS/208/7doi:10.26093/cds/vizier.22080007CDSJeong H.Yi S.K.Kyeong J.Sarzi M.Sung E.-C.Oh K.2013-11-12T20:46:20Z2013-10-28T08:54:41ZCDS support team

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

cds-question@unistra.frchemical-abundancesgalaxiesspectroscopyvisible-astronomysloan-photometrygalaxy-classification-systemsredshiftedSeveral studies have reported the presence of sodium excess objects having neutral atomic absorption lines at 5895{AA} (Na.D) and 8190{AA} that are deeper than expected based on stellar population models that match the stellar continuum. The origin of these lines is therefore hotly debated. van Dokkum & Conroy (2010Natur.468..940V) proposed that low-mass stars (<~0.3M_{sun}_) are more prevalent in massive early-type galaxies, which may lead to a strong Na I 8190 line strength. It is necessary to test this prediction, however, against other prominent optical line indices such as Na.D, Mg b, and Fe 5270, which can be measured with a significantly higher signal-to-noise ratio than Na I 8190. We identified a new sample of roughly 1000 Na.D excess objects (NEOs; ~8% of galaxies in the sample) based on Na.D line strength in the redshift range 0.00<=z<=0.08 from the Sloan Digital Sky Survey (SDSS) DR7 through detailed analysis of galaxy spectra. We explore the properties of these new objects here. The novelty of this work is that the galaxies were carefully identified through direct visual inspection of SDSS images, and we systematically compared the properties of NEOs and those of a control sample of galaxies with normal Na.D line strengths. We note that the majority of galaxies with high velocity dispersions ({sigma}_e_>250km/s) show Na.D excesses.2013ApJS..208....7Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/208/7CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)J/A+A/445/79 : Nearby early-type gal. with ionized gas. II. (Annibali+, 2006)J/A+A/433/497 : Nearby early-type gal. with ionized gas. I. (Rampazzo+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/208/7https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/208/7http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/208/7https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/208/7https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/208/7http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/208/7GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/208/7/table5 (A sample of the catalog of Na.D excess objects)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/208/7/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/208/7/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/208/7/table5?GETtext/xml+votable180.050000true6.40708330.03672220.0055555555555555565/4309 6/1 547 555 4105 4128 4174 4188 4191 4265 4271 4301 4314 4317 4345 4369 4376 4383 4385 4392 4410 4429 4445 4469 4484 4488 4491 4493 4525 4530 4540 4541 4564 4571 4577 4593 4594 4601 4613 4627 4647 4650 4651 4654 4689 4705 4719 4727 4742 4749 4754 4772 4784 4799 4804 4830 4871 4881 4887 4902 4934 4950 4983 4986 4988 4992 5004 5006 5010 5022 5045 5058 5061 5072 5075 5086 5091 5092 5101 5103 5107 5110 5117 5122 5128 5132 5139 5142 5146 5149 5153 5156 5162 5169 5184 5192 5201 5228 5244 5255 5281 5305 5342 5350 5361 5362 5380 5385 5394 5398 5400 5407 5445 5470 5486 5510 5515 5528 5535 5553 5559 5573 5605 5606 5608 5610 5617 5618 5647 5656 5660 5661 5665 5666 5668 5683 5688 5689 5692 5701 5716 5736 5771 5779 5805 5807 5866 5883 5891 5897 5913 5918 5928 5930 5931 5942 5972 5974 5975 5978 5982 5987 5989 5997 6000 6008 6009 6011 6023 6029 6030 6074 6095 6105 6119 6212 6213 6215 6216 6219 6258 6261 6263 6266 6270 6441 6480 6489 6499 6515 6538 6546 6551 6553 6577 6600 6608 6639 6650 6741 6992 7170 7187 7198 7207 7239 7258 7262 7264 7295 7309 7311 7320 7322 7324 7339 7344 7345 7352 7359 7374 7375 7412 7419 7429 7442 7446 7450 7484 7498 7532 7552 7587 8199 8207 8213 8227 8241 8247 8264 8266 8267 8268 8269 8271 8288 8291 8295 8306 8330 8331 8342 8344 8345 8350 8351 8352 8359 8370 8375 8378 8391 8393 8396 8430 8442 8444 8468 8469 8479 8482 8484 8502 8514 8519 8520 8524 8526 8527 8533 8535 8537 8549 8555 8560 8563 8564 8569 8607 8617 8621 8622 8650 8659 8661 8662 8676 8679 8683 8696 8700 8704 8712 8735 8747 8752 8757 8758 8767 8770 8778 8784 8785 8787 8792 8801 8807 8816 8821 8823 8824 8828 8830 8839 8841 8845 8850 8869 8877 8883 8886 8888 8890 8895 8905 8922 8926 8933 8938 8942 8946 8948 8953 8962 8963 8969 8975 8997 9005 9008 9013 9021 9028 9056 9073 9088 9127 9129 9141 9155 9164 9187 9227 9249 9251 9252 9259 9260 9264 9286 9309 9333 9348 9354 9395 9397 9403 9406 9408 9433 9438 9448 9470 9471 9487 9515 9605 9610 9624 9751 9801 9804 9805 9813 9814 9821 9844 9853 9860 9864 9883 9885 9889 9891 9909 9916 9938 9949 9950 9953 9979 9980 9983 9987 9990 9992 10027 10104 10105 10115 10120 10147 10154 10182 10200 10214 10248 10256 10272 10292 10293 10294 10317 10322 10323 10335 10339 10340 10342 10349 10379 10400 10401 10411 10413 10415 10419 10425 10429 10438 10441 10442 10445 10446 10450 10451 10460 10461 10469 10525 10529 10533 10534 10563 10574 10630 10679 10686 10716 10720 10757 10763 10774 10835 10845 10846 10854 10859 10867 10868 10869 10893 10913 10915 10926 10956 10965 10968 10972 10997 11001 11003 11010 11016 11034 11041 11051 11053 11062 11070 11086 11097 11114 11120 11153 11169 11173 11175 11178 11185 11191 11221 11242 11243 11245 11253 11258 11331 11386 11392 11406 11408 11410 11424 11433 11497 11507 11512 11591 11783 11800 11813 11816 11832 11845 11912 11936 12405 12551 17320 17470 17492 17495 17500 17503 17511 17522 17561 17569 17578 17751 17756 17770 17806 17810 17816 17821 17835 17841 17998 18007 18009 18011 18033 18066 18072 18074 18411 18537 18589 18775 18792 18845 18860 18861 19031 19034 19047 19058 19096 19106 19107 19202 19410 19458 19671 19676 19686 19735 19840 19993 20004 20005 20011 20035 21845 21877 21965 22008 22397 23101 23144 23185 23196 23208 23211 23212 25565 25843 25846 25907 25910 25932 25942 25945 25950 25958 25959 25968 25977 25979 26001 26005 26030 26035 26051 26053 26054 26102 26110 26196 26198 26225 26268 26295 26312 26350 26381 26392 26393 26410 26414 26424 26433 26436 26441 26448 26451 26457 26459 26460 26479 26486 26487 26495 26509 26511 26512 26513 26527 26532 26556 26560 26563 26570 26574 26584 26588 26590 26605 26619 26945 26953 26976 26977 26978 26986 27004 27039 27056 27071 27076 27082 27096 27105 27107 27109 27110 27121 27123 27127 27128 27219 27224 27236 27239 27251 27301 27315 27324 27340 27343 27346 27347 27373 27396 27412 27417 27444 27455 27467 27468 27479 27480 27484 27486 27503 27512 27528 27537 27541 27543 27551 27552 27560 27563 27577 27586 27590 27595 27603 27616 27641 27643 27682 27705 27714 27731 27737 27741 27751 27755 27774 27783 27805 27814 27821 27827 27828 27836 27864 27893 27896 27906 27910 27914 27936 28005 28017 28022 28036 28041 28068 28080 28082 28106 28127 28130 28143 28150 28155 28188 28198 28236 28237 28249 28251 28252 28254 28273 28274 28285 28290 28291 28294 28295 28297 28298 28301 28321 28346 28368 28369 28370 28383 28402 28406 28408 28409 28414 28415 28420 28427 28429 28446 28451 28467 28473 28484 28498 28526 28544 28548 28558 28561 28570 28577 28599 28603 28604 28612 28623 28625 28626 28636 28655 30036 30044 31358 31397 31418 31423 31436 31446 31447 31455 31458 31459 31465 31466 31467 31468 31473 31487 31546 31658 31668 31670 31673 31675 31677 31692 31693 31699 31717 31718 32403 32427 32432 32486 32492 32511 32684 36728 36729 36733 36767 36780 36792 45039 49085 49120 49128https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/208/7?format=asciiOpticaldefaultJ/ApJS/208/7/table5A sample of the catalog of Na.D excess objectsSDSSSDSS-DR7 IAU name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharMorphMorphology (3)meta.code;src.morphcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObjIDSDSS-DR7 object identifier Link to the SDSS online data for this object (58NNNNNNNNNNNNNNNmeta.idRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainz[0.007/0.0721] SDSS-DR7 spectroscopic redshiftsrc.redshiftfloatrMag[-23.7/-20.7] SDSS absolute r band magnitudemagphys.magAbs;em.opt.Rfloatu-r[1.27/6.89] SDSS (u-r) color indexmagphot.color;em.opt.U;em.opt.RfloatfNaD[0.5/4.22] NaD excess index (1)spect.indexfloatNaD[2.9/10.8] Observed NaD line strength; in {AA} (2)0.1nmspect.line.intensityfloatfMgb[-0.57/1.26] Mgb excess indexspect.indexfloatMgb[0.6/5.6] Observed Mgb line strength; in {AA} (2)0.1nmspect.line.intensityfloatfFe[-0.75/1.75] Fe5270 excess indexspect.indexfloatFe[0.4/5.5] Obs. Fe5270 line strength; in {AA} (2)0.1nmspect.line.intensityfloatfHb[-1.72/0.23] H{beta} excess indexspect.indexfloatHb[-2.4/5] Obs. H{beta} line strength; in {AA} (2)0.1nmspect.line.intensity;em.line.HbetafloatClassBPT class; emission line classification (4)src.classchar