J/ApJ/837/42ivo://CDS.VizieR/J/ApJ/837/42doi:10.26093/cds/vizier.18370042CDSDouglass K.A.Vogeley M.S.2020-01-29T13:50:24Z2017-11-17T13:18:20ZCDS support team

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

cds-question@unistra.frchemical-abundancesgalaxiesspectroscopyredshiftedabsolute-magnitudeWe examine how the cosmic environment affects the chemical evolution of galaxies in the universe by comparing the N/O ratio of dwarf galaxies in voids with that of dwarf galaxies in denser regions. Ratios of the forbidden [OIII] and [SII] transitions provide estimates of a region's electron temperature and number density. We estimate the abundances of oxygen and nitrogen using these temperature and density estimates and the emission-line fluxes [OII]3727, [OIII]4959,5007, and [NII]6548,6584 with the direct T_e_ method. Using spectroscopic observations from the Sloan Digital Sky Survey Data Release 7, we are able to estimate the N/O ratio in 42 void dwarf galaxies and 89 dwarf galaxies in denser regions. The N/O ratio for void dwarfs (M_r_>-17) is slightly lower (~12%) than for dwarf galaxies in denser regions. We also estimate the nitrogen and oxygen abundances of 2050 void galaxies and 3883 galaxies in denser regions with M_r_>-20. These somewhat brighter galaxies (but still fainter than L_*_) also display similar minor shifts in the N/O ratio. The shifts in the average and median element abundance values in all absolute magnitude bins studied are in the same direction, suggesting that the large-scale environment may influence the chemical evolution of galaxies. We discuss possible causes of such a large-scale environmental dependence of the chemical evolution of galaxies, including retarded star formation and a higher ratio of dark matter halo mass to stellar mass in void galaxies.2017ApJ...837...42Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/837/42CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)V/147 : The SDSS Photometric Catalog, Release 12 (Alam+, 2015)J/ApJ/511/639 : Abundances in blue compact galaxies (Izotov+, 1999)J/MNRAS/330/75 : Chemical abundances in UV-selected galaxies (Contini+, 2002)J/A+A/448/955 : Abundances of emission galaxies in SDSS-DR3 (Izotov+, 2006)J/ApJ/636/214 : HII regions in dwarf irregular galaxies (van Zee+, 2006)J/ApJ/765/140 : Stacked spectra of SDSS star forming galaxies (Andrews+, 2013)J/ApJ/834/186 : Metallicity of MPA-JHU SDSS-DR7 dwarf gal. (Douglass+, 2017)http://www.mpa-garching.mpg.de/SDSS/DR7/ : MPA-JHU DR7 releasehttp://www.sdss.org/ : SDSS home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/837/42https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/837/42http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/837/42https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/837/42https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/837/42http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/837/42GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/837/42/table1 (Analyzed dwarf galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/837/42/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/837/42/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/837/42/table1?GETtext/xml+votable180.050000true140.0177917-0.50249170.0055555555555555566/4110 4378 4379 4417 4422 4790 4804 4849 4853 4925 4997 5044 5105 5115 5305 5315 5357 5400 5415 5471 5495 5505 5532 5556 5559 5565 5579 5600 5617 5680 5763 5782 5800 5839 5848 5857 6042 6058 6060 6228 6249 6340 6491 6503 6514 6583 6655 6913 7219 7233 7245 7319 7431 7456 8253 8303 8522 8559 8730 8881 8890 9082 9147 9362 9453 9455 9878 10295 10303 10358 10360 10425 10429 10544 10551 10557 10565 10568 10581 10595 10731 10739 10745 10862 10917 10924 10930 10943 11082 11131 11362 11393 11404 11478 11851 11928 26017 26051 26102 26104 26203 26207 26345 26459 26547 26551 26562 26572 26588 26951 27110 27287 27290 27301 27332 27465 27527 27743 27849 27860 27933 27941 28205 28221 28255 28266 28313 28344 28454 28492 28573 28657https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/837/42?format=asciidefaultJ/ApJ/837/42/table1Analyzed dwarf galaxiesSimbadNameSimbad column added by the CDSmeta.idcharN/H[6/7.5] The 12+log(N/H) abundance (3)phys.abundfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[63713/2496108] KIAS-VAGC galaxy index number (1)meta.id;meta.mainintf_Seq[e] e= extreme low-metallicity dwarf galaxy; flag added by CDS (following table 3) (2)meta.codecharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainzsp[0.02/0.03] Spectroscopic redshift, SDSS DR7src.redshiftfloatrMag[-17/-16.3] Absolute r band magnitude (1)magphys.magAbsfloatO/H[7/9] The 12+log(O/H) abundance (3)phys.abundfloate_O/H[0.02/0.7] Uncertainty in O/H (3)stat.error;phys.abundfloate_N/H[0.02/0.4] Uncertainty in N/H (3)stat.error;phys.abundfloatN/O[-2/-0.6] The log(N/O) abundance (3)phys.abundfloate_N/O[0.03/0.8] Uncertainty in N/O (3)stat.error;phys.abundfloatLocLocation code ("Void" (42 occurrences); "Wall" (89 occurrences) or "Uncertain") (4)src.classcharDR12Display data from the SDSS-DR12 photometric catalog (Alam+, 2015, V/147) within 1"meta.ref.urlcharSloanDisplay the online SDSS data for the nearest objectmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlchar