Classification of LAMOST DR4 galaxies J/MNRAS/474/1873 ivo://CDS.VizieR/J/MNRAS/474/1873 doi:10.26093/cds/vizier.74741873 CDS Wang L.-L. Luo A.-L. Shen S.-Y. Hou W. Kong X. Song Y.-H.,Zhang J.-N. Wu H. Cao Z.-H. Hou Y.-H. Wang Y.-F. Zhang Y. Zhao Y.-H. 2024-08-18T20:17:08Z 2021-03-04T09:36:59Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr surveys galaxies catalogs visible-astronomy sloan-photometry spectroscopy We study the classification and composite spectra of galaxies in the fourth data release (DR4) of the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST). We select 40182 spectra of galaxies from LAMOST DR4, which have photometric information but no spectroscopic observations in the Sloan Digital Sky Survey (SDSS). These newly observed spectra are recalibrated and classified into six classes - passive, H{alpha}-weak, star-forming, composite, LINER and Seyfert - using the line intensity (H{beta}, [OIII] 5007, H{alpha} and [NII] 6585). We also study the correlation between spectral class and morphological type through three parameters: concentration index, (u-r) colour and D4000n index. We calculate composite spectra of high signal-to-noise ratio (S/N) for six spectral classes and, using these composites, we pick out some features that can differentiate the classes effectively, including H{beta}, Fe5015, H{gamma}A, HK and the Mg2 band. In addition, we compare our composite spectra with the SDSS ones and analyse their differences. A galaxy catalogue of 40182 newly observed spectra (36601 targets) and the composite spectra of the six classes are available online (http://sciwiki.lamost.org/downloads/wll). 2018MNRAS.474.1873W https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/474/1873 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to V/153 : LAMOST DR4 catalogs (Luo+, 2018) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/474/1873 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/474/1873 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/474/1873 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/474/1873 https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/474/1873 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/474/1873 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/MNRAS/474/1873/catalog (Galaxy catalogue with classification and related information for our Main sample) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/474/1873/catalog? https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/474/1873/catalog? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/474/1873/catalog? 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26186-26187 26190-26193 26195 26204-26206 26209 26211 26217 26221-26224 26226 26228-26229 26231 26234-26238 26242-26243 26246-26247 26249-26251 26254 26258 26262 26264-26266 26268 26271 26273-26276 26278-26279 26291 26293-26296 26303 26305 26307-26310 26313 26315 26320 26322-26324 26326-26327 26344-26345 26348-26349 26351 26354 26361 26363 26365 26367 26369 26373 26377-26379 26388 26394 26396 26398-26399 26424 26426-26427 26433-26434 26436 26439-26441 26443 26448 26450-26452 26454 26464-26465 26467-26470 26472-26473 26475-26477 26479 26487-26488 26504-26505 26508-26509 26511 26517 26519-26521 26523 26531 26536-26537 26548 26550-26551 26553-26555 26557-26562 26565 26567 26570 26582-26584 26586-26587 26600-26602 26604-26605 26607-26608 26610-26611 26616 26618-26621 26623 26845-26847 26861-26863 26867-26870 26879 26896-26897 26899 26909-26910 26925-26927 26929-26930 26932-26933 26944-26946 26952 26961 26963-26965 26967 26972-26974 26976 26978 26981-26983 26986 26989-26990 26993-26994 26997 27009-27011 27028 27030-27031 27044-27045 27047 27050 27052-27053 27055 27077-27079 27084-27085 27087 27110 27112-27113 27115-27118 27120-27121 27123 27131 27133-27135 27167 27182-27183 27187 27201 27203 27221-27223 27228-27230 27255-27258 27260 27267 27280-27282 27284-27285 27287 27290 27296-27298 27304 27310-27311 27322 27337 27348 27350-27354 27368 27370 27391-27393 27408-27410 27412-27414 27417-27418 27426 27446-27447 27454 27470 27476 27478-27481 27483 27503 27507-27509 27515 27523 27542-27543 27550 27554-27558 27563 27565-27569 27571 27574-27575 27582-27583 27586 27589-27591 27594 27596-27597 27599 27604 27613-27617 27619 27621 27625-27627 27630 27632 27636 27638-27639 27643 27656-27657 27659-27662 27664 27668-27669 27671 27674-27675 27677 27680-27681 27683 27690 27692-27693 27695 27701-27703 27708-27710 27712-27714 27716 27719-27722 27724 27726 27746 27750 27755 27758-27759 27761 27764-27765 27767 27772-27773 27775 27777-27778 27780-27782 27790 27792-27794 27796-27797 27805 27808 27810 27814 27816 27820 27823 27825 27828-27829 27838-27839 27841 27843-27844 27849-27850 27853 27858-27859 27861-27863 27866 27872-27873 27878 27882 27885 27891-27892 27895 27897 27901 27903 27908 27910-27911 27913-27914 27920-27921 27923 27928-27929 27931 27934-27938 27944-27946 27948 27950-27951 27953 27955 27958-27960 27962 27965-27966 27968 27972 27974 27976-27978 27980 27982-27984 27986-27989 27991 27993 27995 27997-27998 28004 28007-28010 28012-28014 28021 28024-28025 28027-28028 28036-28038 28049 28051-28052 28065-28068 28070-28071 28074-28075 28082-28083 28088-28089 28098-28100 28103 28107 28109-28111 28124 28126-28127 28132-28134 28139 28141-28143 28146-28149 28154 28157 28165 28168-28170 28174-28176 28185-28187 28196-28197 28199-28200 28203-28206 28208 28210-28213 28216 28218 28221 28223-28224 28226-28227 28229 28232 28234-28236 28238-28239 28241 28244 28249 28252 28254-28257 28259 28263-28265 28267 28272-28274 28278-28279 28284 28286-28287 28293 28296-28298 28328 28330-28333 28340-28342 28345 28349-28351 28353 28355 28360 28362 28365 28372 28374 28376-28377 28380 28382-28383 28393-28394 28397-28399 28404-28405 28407 28409-28411 28421 28423 28429 28431-28432 28435 28445 28449 28452 28461-28462 28466 28470-28472 28474 28480-28482 28488-28489 28491-28494 28497-28499 28501-28506 28509 28511-28513 28524-28526 28532 28534-28535 28538 28540-28541 28547-28548 28551 28553 28558-28559 28561-28563 28567 28593-28595 28604-28606 28609-28614 28616 28618-28620 28622 28624 28626 28631 28637 28640-28642 28648 28650-28651 28654 28659 28661 30919 30926-30927 30930-30931 30938 30949 30951 30964 30966 30968-30969 31037-31039 31073 31075 31080-31081 31083-31084 31087 31090 31097-31099 31121 31124 31127 31133 31158 31164 31166-31168 31170 31184-31185 31210 31223 31229 31231 31285-31286 31293-31294 31305 31307-31308 31311-31312 31315 31318 31321-31322 31324 31328 31331 31333 31336 31338 31342-31344 31353-31355 31370 31375 31384 31386 31392 31395 31401-31405 31408-31410 31416 31424-31425 31428-31430 31433-31434 31437-31438 31446 31460-31461 31481 31486 31505 31513 31517-31518 31527 31532-31534 31538 31542 31544-31545 31547 31549-31550 31552 31554 31592 31612 31631 31651-31653 31656 31658-31659 31710 31731 31737 31739-31741 31800 31802-31803 31878 31882 31886 31888 31890 31892-31893 31895 31908 31912-31913 31915-31916 31936 31938 32184 32186 32256 32327 32333 32335 32344-32345 32347 32368 32371-32372 32374 32377 32379 32384 32408 32451 32454-32455 32460-32462 32465-32468 32470 32476-32478 32485 32492-32494 32497-32498 32503 32506-32507 32510-32511 32517 32519 32528 32547-32550 32552-32553 32555-32556 32558-32559 32642 32646 32691 32700 32761 36801-36802 36837 36855 36859 40927 40939 40942 40949-40951 45023 45033 45035 45038 45043-45045 45053 49105 49109-49111 49116-49117 2.040811542443644e-19 6.090060298487514e-19 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/474/1873?format=ascii Optical default J/MNRAS/474/1873/catalog Galaxy catalogue with classification and related information for our Main sample recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int LAMOST LAMOST name (JHHMMSS.ss+DDMMSS.s) meta.id;meta.main char n_LAMOST [ab] Note (1) meta.note char RAJ2000 Right ascension (J2000) deg pos.eq.ra;meta.main indexed DEJ2000 Declination (J2000) deg pos.eq.dec;meta.main indexed z Redshift src.redshift double SNRr ? Signal-to-noise in r band from LAMOST catalog stat.snr double nullable umag ? SDSS Petrosian u magnitude mag phot.mag;em.opt.U double nullable gmag ? SDSS Petrosian g magnitude mag phot.mag;em.opt.B double nullable rmag ? SDSS Petrosian r magnitude mag phot.mag;em.opt.R double nullable imag ? SDSS Petrosian i magnitude mag phot.mag;em.opt.I double nullable zmag ? SDSS Petrosian z magnitude mag phot.mag;em.opt.I double nullable C Concentration index (2) meta.code;spect.index float u-r SDSS u-r colour index mag phot.color;em.opt.U;em.opt.R double D4000n 4000{AA} break (3) spect.index double FHb ? H{beta} line flux (in 10^-17^erg/cm^2^/s/{AA} unit) 1e-19W.m**-2.nm**-1 meta.unit;phot.flux;spect.line double nullable FOIII ? [OIII] line flux (in 10^-17^erg/cm^2^/s/{AA} unit) 1e-19W.m**-2.nm**-1 meta.unit;phot.flux;spect.line double nullable FHa ? H{alpha} line flux (in 10^-17^erg/cm^2^/s/{AA} unit) 1e-19W.m**-2.nm**-1 meta.unit;phot.flux;spect.line double nullable FNII ? [NII] line flux (in 10^-17^erg/cm^2^/s/{AA} unit) 1e-19W.m**-2.nm**-1 meta.unit;phot.flux;spect.line double nullable SClass [0/5]? Spectral class (4) meta.code.class int nullable Simbad Simbad column added by the CDS meta.ref.url char