J/MNRAS/477/1708ivo://CDS.VizieR/J/MNRAS/477/1708doi:10.26093/cds/vizier.74771708CDSPawlik M.M.Taj Aldeen L.Wild V.Mendez-Abreu J.Lahen N.,Johansson P.H.Jimenez N.Lucas W.Zheng Y.Walcher C.J.Rowlands K.2024-08-18T20:18:56Z2021-06-28T13:24:56ZCDS support team

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

cds-question@unistra.frgalaxiesspectroscopygalaxy-classification-systemsPost-starburst galaxies can be identified via the presence of prominent Hydrogen Balmer absorption lines in their spectra. We present a comprehensive study of the origin of strong Balmer lines in a volume-limited sample of 189 galaxies with 0.01<z<0.05, log(M*/M_{sun}_)>9.5 and projected axial ratio b/a>0.32. We explore their structural properties, environments, emission lines, and star formation histories, and compare them to control samples of star-forming and quiescent galaxies, and simulated galaxy mergers. Excluding contaminants, in which the strong Balmer lines are most likely caused by dust-star geometry, we find evidence for three different pathways through the post-starburst phase, with most events occurring in intermediate-density environments: (1) a significant disruptive event, such as a gas-rich major merger, causing a starburst and growth of a spheroidal component, followed by quenching of the star formation (70 per cent of post-starburst galaxies at 9.5<log(M*/M_{sun}_)<10.5 and 60 per cent at log(M*/M_{sun}_)>10.5); (2) at 9.5<log(M*/M_{sun}_)<10.5, stochastic star formation in blue-sequence galaxies, causing a weak burst and subsequent return to the blue sequence (30 per cent); (3) at log(M*/M_{sun}_)>10.5, cyclic evolution of quiescent galaxies which gradually move towards the high-mass end of the red sequence through weak starbursts, possibly as a result of a merger with a smaller gas-rich companion (40 per cent). Our analysis suggests that active galactic nuclei (AGNs) are 'on' for 50 per cent of the duration of the post-starburst phase, meaning that traditional samples of post-starburst galaxies with strict emission-line cuts will be at least 50 per cent incomplete due to the exclusion of narrow-line AGNs.2018MNRAS.477.1708Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/477/1708CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/477/1708https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/477/1708http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/477/1708https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/477/1708https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/477/1708http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/477/1708GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/477/1708/table2 (Analysis results for the post-starburst galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/477/1708/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/477/1708/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/477/1708/table2?GETtext/xml+votable180.050000true149.4564506-0.21092280.0055555555555555566/548 4182 4304 4312 4457 4496 4639 4643 4649 4681 4684 4733 4742 4848 4990 5045 5102 5129 5201 5207 5219 5223 5343 5359 5362 5395 5401 5512 5584 5598 5630 5636 5656-5657 5797 5900 5958 5970 6261 6446 6458 6466 6476 6532 6577 7195 7238 7240 7321 7346 7412 7419 7425 7553 8207 8214 8221 8256 8260 8266 8269 8432 8449 8464 8469 8475 8489 8505 8527 8568 8768 8777 8784 8973 8977 8996 9019 9150 9178 9228 9235 9254 9260 9290 9437 9441 9517 9733 9794 9929 9980 10185 10284 10334 10347 10372 10403 10419 10429 10449 10962 10965 10983 11049 11273 11275 11291 11328 11376 11779 11831 17742 17805 18083 18367 18839 18955 19023 19100 19110 19988 19993 23050-23051 23056 23183 23195 23204 25907 25964 26162 26195 26211 26341 26400 26436 26484 26942 26975 26986-26987 27107 27133 27238 27343 27456 27471 27480 27489 27507 27576-27577 27579 27618 27640 27731 27807 27915 27998 28016 28118 28149 28247 28281 28322 28378 28532 28544 28591 28597 31435 31466 31550 31698 31723 32408 32682 36732 40959https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/477/1708?format=asciiOpticaldefaultJ/MNRAS/477/1708/table2Analysis results for the post-starburst galaxiesSimbadNameSimbad column added by the CDSmeta.idcharnSersic index (3)stat.fit.paramdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintspecobjidSDSS specobjidmeta.id;meta.mainPSBtypePost-starburst type (defined in Section 2.2.1 of the paper)src.classcharlogMlogarithmic stellar mass (1)log(solMass)phys.massdoublePC1Spectral index PC1, 4000{AA}-break strength (2)spect.indexfloatPC2Spectral index PC2, excess Balmer absorption above that expected based on the measured 4000{AA}-break strength (2)spect.indexfloatlog([NII]/Ha)Line ratio [NII]/Ha from the BPT diagram (calculated from SDSS-MPAJHU)arith.zpdoublelog([OIII]/Hb)Line ratio [OIII]/Hb from the BPT diagram (calculated from SDSS-MPAJHU);arith.zpdoubleEQWHaEquivalent width of the Halpha emission line (data from SDSS-MPAJHU)0.1nmspect.line.eqWidthdoubleHa/HbBalmer decrement (Halpha/Hbeta, calculated from data from SDSS-MPAJHU)phot.flux;arith.ratiodoublefM1Fraction of recently formed stellar mass (within the last 1Gyr) obtained using STARLIGHT fits to the SDSS SEDphys.mass;meta.fitsfloatfM15Fraction of recently formed stellar mass (within the last 1.5Gyr) obtained using STARLIGHT fits to the SDSS SEDphys.mass;meta.fitsfloatIMGFlag[0/1] Flag indicating the presence of a contaminating source in the SDSS r-band imagemeta.codeintCConcentration index (3)meta.code;spect.indexdoubleALight-weighted asymmetry (3) (under a 180-degree rotation)spect.line.asymmetrydoubleAs? shape asymmetry (3) (under a 180-degree rotation)spect.line.asymmetrydoublenullableAs90? shape asymmetry (3) (under a 90-degree rotation)spect.line.asymmetrydoublenullableGGini index (3)meta.code;spect.indexdoubleM20M20 statistics (3)stat.fit.paramdoubleSigma5pLocal galaxy density measurements (calculated using photometric SDSS redshift measurements)phys.densitydoubleSigma5sLocal galaxy density measurements (calculated using spectroscopic SDSS redshift measurements)phys.densitydoublef_Sigma5p[0] Flag corresponding to the local galaxy density measurement Sigma5p, related to proximity to survey boardersmeta.codeintf_Sigma5s[0/1] Flags corresponding to the local galaxy density measurement Sigma5s, related to the proximity to survey boardersmeta.codeintSloanDisplay the online SDSS data for this galaxymeta.ref.urlchar_RAPosiitons from SDSS DR7 (right ascension part)degpos.eq.ra;meta.main_DEPosiitons from SDSS DR7 (declination part)degpos.eq.dec;meta.main