J/ApJ/864/144ivo://CDS.VizieR/J/ApJ/864/144doi:10.26093/cds/vizier.18640144CDSDouglass K.A.Vogeley M.S.Cen R.2019-09-26T08:41:07Z2019-09-26T09:30:45ZCDS support team

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

cds-question@unistra.frchemical-abundancesgalaxiesspectroscopyredshiftedvisible-astronomyWe study how the void environment affects the chemical evolution of galaxies in the universe by comparing the oxygen and nitrogen abundances of dwarf galaxies in voids with dwarf galaxies in denser regions. Using spectroscopic observations from the Sloan Digital Sky Survey Data Release 7, we estimate the oxygen, nitrogen, and neon abundances of 889 void dwarf galaxies and 672 dwarf galaxies in denser regions. We use the Direct T_e_ method for calculating the gas-phase chemical abundances in the dwarf galaxies because it is best suited for low-metallicity, low-mass (dwarf) galaxies. A substitute for the [OII]{lambda}3727 doublet is developed, permitting oxygen abundance estimates of SDSS dwarf galaxies at all redshifts with the Direct T_e_ method. We find that void dwarf galaxies have about the same oxygen abundance and Ne/O ratio as dwarf galaxies in denser environments. However, we find that void dwarf galaxies have slightly higher neon (~10%) abundances than dwarf galaxies in denser environments. The opposite trend is seen in both the nitrogen abundance and N/O ratio: void dwarf galaxies have slightly lower nitrogen abundances (~5%) and lower N/O ratios (~7%) than dwarf galaxies in denser regions. Therefore, we conclude that the void environment has a slight influence on dwarf galaxy chemical evolution. Our mass-N/O relationship shows that the secondary production of nitrogen commences at a lower stellar mass in void dwarf star-forming galaxies than in dwarf star-forming galaxies in denser environments. We also find that star-forming void dwarf galaxies have higher HI masses than the star-forming dwarf galaxies in denser regions. Our star-forming dwarf galaxy sample demonstrates a strong anti-correlation between the sSFR and N/O ratio, providing evidence that oxygen is produced in higher-mass stars than those which synthesize nitrogen. The lower N/O ratios and smaller stellar mass for secondary nitrogen production seen in void dwarf galaxies may indicate both delayed star formation as predicted by {Lambda}CDM cosmology and a dependence of cosmic downsizing on the large-scale environment. A shift toward slightly higher oxygen abundances and higher HI masses in void dwarf galaxies could be evidence of larger ratios of dark matter halo mass to stellar mass in voids compared with denser regions.2018ApJ...864..144Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/864/144CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)J/AJ/118/2561 : Survey of gal. within prominent nearby voids (Grogin+, 1999)J/ApJ/511/639 : Abundances in blue compact galaxies (Izotov+, 1999)J/AJ/119/32 : Survey of galaxies within nearby voids. II (Grogin+, 2000)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/AJ/144/16 : Optical & HI properties of galaxies in voids (Kreckel+, 2012)J/ApJ/765/140 : Stacked spectra of SDSS star forming galaxies (Andrews+, 2013)J/ApJ/819/110 : Extremely metal-poor gal. in SDSS. II. (Sanchez Almeida+ 2016)J/ApJ/834/186 : Metallicity of MPA-JHU SDSS-DR7 dwarf gal. (Douglass+, 2017)J/ApJ/837/42 : N/O ratio of dwarf galaxies from SDSS (Douglass+, 2017)http://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/864/144https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/864/144http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/864/144https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/864/144https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/864/144http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/864/144GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/864/144/table1 (Analyzed dwarf galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/864/144/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/864/144/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/864/144/table1?GETtext/xml+votable180.050000true171.4670833-0.66160.0055555555555555565/1409 6565 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32441 32442 32482 45045https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/864/144?format=asciiOpticaldefaultJ/ApJ/864/144/table1Analyzed dwarf galaxiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[40726/3011653] KIAS-VAGC galaxy index numbermeta.id;meta.mainintRAJ2000[7/17] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainz[0.0001/0.03] Spectroscopic redshiftsrc.redshiftfloatlog(O/H)[7.1/9.3] The 12+log(O/H) abundance (1)phys.abundfloate_log(O/H)[0.02/0.6] Uncertainty in log(O/H) (1)stat.errorfloatlog(N/H)[5.1/7.7] The 12+log(N/H) abundance (1)phys.abundfloate_log(N/H)[0/0.5] Uncertainty in log(N/H) (1)stat.errorfloatlog(Ne/H)[5.1/8.3] The 12+log(Ne/H) abundance (1)phys.abundfloate_log(Ne/H)[0.01/0.8] Uncertainty in log(Ne/H) (1)stat.errorfloatlog(N/O)[-3.9/-0.3] log N/O abundance ratio (1)phys.abundfloate_log(N/O)[0.02/0.6] Uncertainty in log(N/O) (1)stat.errorfloatlog(Ne/O)[-2.4/-0.4] log Ne/O abundance ratio (1)phys.abundfloate_log(Ne/O)[0.02/0.9] Uncertainty in log(Ne/O) (1)stat.errorfloatLocLocation (2)src.classcharD17Display data from Douglass+, 2017, J/ApJ/837/42meta.ref.urlintnullableSloanDisplay the online SDSS data for the nearest objectmeta.ref.urlchar