J/MNRAS/444/744ivo://CDS.VizieR/J/MNRAS/444/744doi:10.26093/cds/vizier.74440744CDSZafar T.Centurion M.Peroux C.Molaro P.D'Odorico V.Vladilo G.,Popping A.2024-08-14T20:18:01Z2015-09-03T09:20:33ZCDS support team

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

cds-question@unistra.frquasarschemical-abundancesWe report here a study of nitrogen and {alpha}-capture element (O, S, and Si) abundances in 18 damped Ly{alpha} absorbers (DLAs) and sub-DLAs drawn from the European Southern Observatory's Ultraviolet Visual Echelle Spectrograph (ESO-UVES) Advanced Data Products (EUADP) data base. We report nine new measurements, five upper and four lower limits of nitrogen that when compiled with available nitrogen measurements from the literature makes a sample of 10^8^ systems. The extended sample presented here confirms the [N/{alpha}] bimodal behaviour suggested in previous studies. Three-quarter of the systems show <[N/{alpha}]>=-0.85 (+/-0.20dex) and one-quarter of the systems show that ratios are clustered at <[N/{alpha}]>=-1.41 (+/-0.14dex). The high [N/{alpha}] plateau is consistent with the Hii regions of dwarf irregular and blue compact dwarf galaxies although extended to lower metallicities and could be interpreted as the result of a primary nitrogen production by intermediate mass stars. The low [N/{alpha}] values are the lowest ever observed in any astrophysical site. In spite of this fact, even lower values could be measured with the present instrumentation, but we do not find them below [N/{alpha}]~-1.7. This suggests the presence of a floor in [N/{alpha}] abundances, which along with the lockstep increase of N and Si may indicate a primary nitrogen production from fast rotating, massive stars in relatively young or unevolved systems.2014MNRAS.444..744Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/444/744CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/556/A141 : ESO-UVES Advanced Data Products (EUADP) sample (Zafar+, 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/444/744https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/444/744http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/444/744https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/444/744https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/444/744http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/444/744GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/444/744/table12 (N and {alpha}-element abundance measurements in DLAs and sub-DLAs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/444/744/table12?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/444/744/table12?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/444/744/table12?GETtext/xml+votable180.050000true0.8456489-26.05511080.0055555555555555566/2348 4168 4279 4947 5051 5270 5306 5563 5714 5886 6403 6591 7168 8371 9095 9827 10436 11418 11498 11765 13314 16269 16589 16625 16752 16798 17190 17244 17314 17317 17404 17516 17662 17898 18004 18086 18271 18366 18466 18769 18858 19206 19411 19416 19490 19680 19682 20450 21012 22593 23099 25009 25245 25285 25294 25307 25540 25628 26109 26175 26453 26479 26614 26882 27161 27237 27348 27396 27526 27667 27687 27728 28039 28042 28174 28281 31331 33746 34044 34379 34437 34503 35737 35751 36271 36320 36792 38853 45525 46651 46856 48149 48154 48474https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/444/744?format=asciidefaultJ/MNRAS/444/744/table12N and {alpha}-element abundance measurements in DLAs and sub-DLAsSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintQSOQSO namemeta.id;meta.maincharn_QSO[*+] New estimate, several components (1)meta.notecharzabs[0.1/4.5] Absorption redshiftsrc.redshiftfloatlogNHI[19.6/21.8] HI column densitylog(cm**-2)phys.columnDensityfloate_logNHI[0.01/0.4] rms uncertainty on logNHIlog(cm**-2)stat.errorfloatl_logNNI[<>= ] Limit flag on logNNImeta.code.errorcharlogNNI[12/16] NI column densitylog(cm**-2)phys.columnDensityfloate_logNNI[0.01/0.4]? rms uncertainty on logNNIlog(cm**-2)stat.errorfloatnullablel_[N/H][<>= ] Limit flag on [N/H]meta.code.error;phys.abundchar[N/H][-4.2/-0.2] Abundance [N/H]log(Sun)phys.abundfloate_[N/H][0.03/0.4]? rms uncertainty on [N/H]log(Sun)stat.error;phys.abundfloatnullablel_[Si/H][<>= ] Limit flag on [Si/H]meta.code.error;phys.abundchar[Si/H][-3.1/0.1]? Abundance [Si/H]log(Sun)phys.abundfloatnullablee_[Si/H][0.01/0.4]? rms uncertainty on [Si/H]log(Sun)stat.error;phys.abundfloatnullablel_[N/Si][<>= ] Limit flag on [N/Si]meta.code.errorchar[N/Si][-1.7/0.7]? Abundance [N/Si]log(Sun)phys.abundfloatnullablee_[N/Si][0.02/0.4]? rms uncertainty on [N/Si]log(Sun)stat.errorfloatnullableaEl{alpha}-element used for the determination of [a/H] and [N/a] ratios (O, S or Si)phys.atmol.elementcharl_[a/H][<>= ] Limit flag on [a/H]meta.code.error;phys.abundchar[a/H][-2.8/0.2] Abundance [{alpha}/H]log(Sun)phys.abundfloate_[a/H][0.02/0.4]? rms uncertainty on [a/H]log(Sun)stat.error;phys.abundfloatnullablel_[N/a][<>= ] Limit flag on [N/a]meta.code.errorchar[N/a][-1.7/0.1] Abundance [N/{alpha}]log(Sun)phys.abundfloate_[N/a][0.01/0.35]? rms uncertainty on [N/a]log(Sun)stat.errorfloatnullableRefsReferences, in refs.dat filemeta.ref;pos.framechar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainnullable_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainnullableJ/MNRAS/444/744/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference numbermeta.id;meta.mainintBibCodeBibCodemeta.bib.bibcodecharautAuthor's namemeta.bib.authorcharComCommentsmeta.notechar