New emission-line galaxies and HII regions J/other/RAA/22.F ivo://CDS.VizieR/J/other/RAA/22.F5015 CDS Lu Y. Luo A.-L. Wang L.-L. Wang Y.-F. Li Y.-B. Han J.-S. Qin L.,Tang Y.-K. Qiu B. Zhang S. Zhang J.-N. Zhao Y.-H. 2024-01-15T11:45:13Z 2023-08-30T13:50:20Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr galaxies h-ii-regions redshifted visible-astronomy infrared-astronomy This work is to retrieve emission-line spectra from the "Unknown" data set in LAMOST DR7 V1.2, most of which are low signal-to-noise ratios spectra. In the work, we perform emission line search and redshift calculations on the Unknown data set to get possible emission line galaxy spectra. Taking the galaxy spectra released by LAMOST as templates, the Product Quantization (PQ) based approximate nearest neighbor (ANN) search is used to retrieve the nearest neighbors of each spectrum. We keep the spectra for which the calculated redshift and the published redshift of the template meet the threshold, and 16188 spectra with emission lines are obtained from the LAMOST DR7 Unknown data set. After visual inspection of spectra 10,266 spectra are left, in which 5828 spectra are identified as emission-line galaxies, 1782 spectra show ionization nebula features, and other 2656 are not clearly classified. Among 5828 spectra, 5720 can be found in Strasbourg astronomical Data Center catalog, Sloan Digital Sky Survey catalog, or NASA/IPAC Extragalactic Database catalog. The 108 spectra (corresponding to 106 unique coordinates of R.A. and decl.) which have no record in these three databases are new discoveries; for the 1782 spectra showing ionization nebula features, most of them have radial velocities less than 150 kilometers per second. We check them with the latest version of WISE HII catalog V2.0 (short for HIICat V2) and 985 out of the 1782 spectra belong to 72 HII regions. Of these HII regions, 43 were previously identified while the other 29 are newly identified in this work including 797 newly observed spectra. Besides, there are still 2656 spectra that cannot be clearly classified although they have obvious emission lines and with small redshift. Finally, 106 new emission-line galaxies and 29 new Galactic HII regions are identified, and we conclude that the ANN method sped up by the PQ algorithm is efficient in solving the problem of pairing spectra with massive data set to figure out their classes. 2022RAA....22f5015L https://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/RAA/22.F5015 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to J/ApJS/212/1 : The WISE catalog of Galactic HII regions (Anderson+, 2014) J/ApJS/234/33 : A GBT survey of large Galactic HII regions (Anderson+, 2018) https://dr7.lamost.org : LAMOST DR7 Home Page https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/RAA/22.F5015 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/RAA/22.F5015 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/RAA/22.F5015 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/RAA/22.F5015 https://vizier.iucaa.in/viz-bin/votable?-source=J/other/RAA/22.F5015 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/RAA/22.F5015 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/other/RAA/22.F5015/galaxy (Catalogue of candidates of galaxy spectra found in our result (table 3)) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/other/RAA/22.F5015/galaxy? https://vizier.iucaa.in/viz-bin/conesearch/J/other/RAA/22.F5015/galaxy? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/other/RAA/22.F5015/galaxy? 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28340-28341 28345 28348 28362 28368 28381 28384 28387 28391-28392 28395-28396 28399-28400 28402 28409-28410 28412 28414 28456 28474-28475 28480-28482 28484-28486 28489 28494 28504 28506 28513 28522 28524 28527 28531 28536-28537 28546 28549 28554-28555 28557 28560 28563 28569 28571 28575 28579 28593 28599 28609 28612 28617 28626 28640 28667 28671 31004 31041 31295 31309-31310 31314-31315 31322 31324 31335-31336 31338-31340 31355 31359 31375 31379-31382 31385-31386 31392 31394 31397-31399 31404 31407-31408 31419 31422-31423 31425-31427 31438 31440 31444-31445 31469 31592 31654 31659 31667 31673 31715 31723 31778 32332 32386 32433 32476 32673 36719 36729 36860-36861 40923 40926 45050 45054 49022 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/other/RAA/22.F5015?format=ascii Optical Infrared default J/other/RAA/22.F5015/hii Catalogue of HII Region in our result (table 2) recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int sp Display the LAMOST DR7 data meta.ref.url char FileLA LAMOST filename meta.id;meta.file char WISE WISE name, if the position represented by the spectrum falls in the HII regions of WISE catalog (GLLL.lll+BB.bbb) meta.id;meta.main char Note Potential 29 candidate Hii regions of the Galaxy that we have identified in our work (1) meta.note char Wtype [CGKQ-] Type in WISE (2) src.class char GLON ? Galactic longidue deg pos.galactic.lon nullable GLAT ? Galactic latitude deg pos.galactic.lat float nullable Rad ? Radius arcsec phys.angSize;src int nullable logHII/Ha ? [HII]/H{alpha} abundance ratio phys.abund float nullable logSII/Ha ? [SII]/H{alpha} abundance ratio phys.abund float nullable Newfound [0/1] New found ? (3) meta.code char LMJD LAMOST Local Modified Julian Day time.epoch int PlanId LAMOST Plan Name obs.field char spId LAMOST Spectrograph ID meta.id;instr int FiberId LAMOST Fiber ID meta.id int
J/other/RAA/22.F5015/galaxy Catalogue of candidates of galaxy spectra found in our result (table 3) z Our redshift src.redshift double recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int sp Display the LAMOST DR7 data meta.ref.url char FileLA LAMOST filename meta.id;meta.file char RAJ2000 Right ascension (J2000) deg pos.eq.ra;meta.main DEJ2000 Declination (J2000) deg pos.eq.dec;meta.main newG [0/1] New galaxy ? (1 for yes) meta.code int Class Our classification src.class char SName Simbad name meta.id char SType Simbad type src.spType char Sz ? Simbad redshift src.redshift;pos.heliocentric double nullable SDSS ? SDSS objId meta.id nullable SDSStype SDSS type src.class char Rad ? SDSS Petro radius arcsec phys.angSize;src double nullable SDSSz ? SDSS redshift src.redshift;pos.heliocentric double nullable e_SDSSz ? SDSS redshift error stat.error double nullable NED NED name meta.id;meta.main char NEDtype NED type src.class char NEDz ? NED redshift src.redshift;pos.heliocentric double nullable e_NEDz ? NED redshift error stat.error double nullable LMJD LAMOST Local Modified Julian Day time.epoch int PlanId LAMOST Plan Name obs.field char spId LAMOST Spectrograph ID meta.id;instr int FiberId LAMOST Fiber ID meta.id int