J/ApJ/705/885ivo://CDS.VizieR/J/ApJ/705/885doi:10.26093/cds/vizier.17050885CDSO'Dowd M.J.Schiminovich D.Johnson B.D.Treyer M.A.Martin C.D.,Wyder T.K.Charlot S.Heckman T.M.Martins L.P.Seibert M.,van der Hulst J.M.2017-12-07T07:27:44Z2012-01-02T13:39:41ZCDS support team

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

cds-question@unistra.frgalaxiesinfrared-sourcesinfrared-astronomyspectroscopyinterstellar-mediumWe present the analysis of the polycyclic aromatic hydrocarbon (PAH) spectra of a sample of 92 typical star-forming galaxies at 0.03<z<0.2 observed with the Spitzer intensified Reticon spectrograph (IRS). We compare the relative strengths of PAH emission features with Sloan Digital Sky Survey optical diagnostics to probe the relationship between PAH grain properties and star formation and active galactic nuclei (AGNs) activity. Short-to-long wavelength PAH ratios, and in particular the 7.7um-to-11.3um feature ratio, are strongly correlated with the star formation diagnostics D_n_(4000) and H{alpha} equivalent width, increasing with younger stellar populations. This ratio also shows a significant difference between active and non-active galaxies, with the active galaxies exhibiting weaker 7.7um emission. A hard radiation field as measured by [OIII]/H{beta} and [NeIII]_15.6um_/[NeII]_12.8um_ effects PAH ratios differently depending on whether this field results from starburst activity or an AGN. Our results are consistent with a picture in which larger PAH molecules grow more efficiently in richer media and in which smaller PAH molecules are preferentially destroyed by the AGN.2009ApJ...705..885Ohttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/705/885CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/741/79 : The Spitzer-SDSS-GALEX Spectroscopic Survey (O'Dowd+, 2011)J/A+A/527/A109 : Dust and PAH emission SEDs of disk galaxies (Popescu+, 2011)J/A+A/514/A5 : PAH luminous galaxies at z~1 (Takagi+, 2010)J/A+A/507/713 : Galaxies with strong PAH emission (Haas+, 2009)J/ApJ/686/127 : Starbursts luminosities based on PAH (Weedman+, 2008)J/ApJ/656/770 : Mid-IR spectrum of star-forming galaxies (Smith+, 2007)J/A+A/319/318 : PAH hypothesis (Pauzat+ 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/705/885https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/705/885http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/705/885https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/705/885https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/705/885http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/705/885GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/705/885/table1 (Dust features, extinction, and line strengths from PAHFIT analysis)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/705/885/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/705/885/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/705/885/table1?GETtext/xml+votable180.050000true160.3439788958.892010.0055555555555555565/1519 6/6046 6047 6069 6070 6071 6073 6075 6112 6114 6120https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/705/885?format=asciiOpticalInfrareddefaultJ/ApJ/705/885/table1Dust features, extinction, and line strengths from PAHFIT analysisrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSSGSSSSGSS (Spitzer SDSS GALEX Spectroscopic Survey) numbermeta.idintRAJ2000Right Ascention in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainF6.2? The 6.2um feature intensityW.m**-2spect.line.intensity;em.IR.4-8umdoublenullablee_F6.2? Uncertainty in F6.2 (1)W.m**-2stat.errordoublenullableF7.7? The 7.7um feature intensityW.m**-2spect.line.intensity;em.IR.4-8umdoublenullablee_F7.7? Uncertainty in F7.7 (1)W.m**-2stat.errordoublenullableF8.3? The 8.3um feature intensityW.m**-2spect.line.intensity;em.IR.8-15umdoublenullablee_F8.3? Uncertainty in F8.3 (1)W.m**-2stat.errordoublenullableF8.6? The 8.6um feature intensityW.m**-2spect.line.intensity;em.IR.8-15umdoublenullablee_F8.6? Uncertainty in F8.6 (1)W.m**-2stat.errordoublenullableF11.3? The 11.3um feature intensityW.m**-2spect.line.intensity;em.IR.8-15umdoublenullablee_F11.3? Uncertainty in F11.3 (1)W.m**-2stat.errordoublenullableF12.0? The 12.0um feature intensityW.m**-2spect.line.intensity;em.IR.8-15umdoublenullablee_F12.0? Uncertainty in F12.0 (1)W.m**-2stat.errordoublenullableF12.6? The 12.6um feature intensityW.m**-2spect.line.intensity;em.IR.8-15umdoublenullablee_F12.6? Uncertainty in F12.6 (1)W.m**-2stat.errordoublenullableF13.6? The 13.6um feature intensityW.m**-2spect.line.intensity;em.IR.8-15umdoublenullablee_F13.6? Uncertainty in F13.6 (1)W.m**-2stat.errordoublenullableF14.2? The 14.2um feature intensityW.m**-2spect.line.intensity;em.IR.8-15umdoublenullablee_F14.2? Uncertainty in F14.2 (1)W.m**-2stat.errordoublenullableF16.4? The 16.4um feature intensityW.m**-2spect.line.intensity;em.IR.15-30umdoublenullablee_F16.4? Uncertainty in F16.4 (1)W.m**-2stat.errordoublenullableF17? The 17um feature intensityW.m**-2spect.line.intensity;em.IR.15-30umdoublenullablee_F17? Uncertainty in F17 (1)W.m**-2stat.errordoublenullableF17.4? The 17.4um feature intensityW.m**-2spect.line.intensity;em.IR.15-30umdoublenullablee_F17.4? Uncertainty in F17.4 (1)W.m**-2stat.errordoublenullabletau9.7? Optical depth of dust extinction at 9.7umphys.absorption.opticalDepthfloatnullableNeII? The [NeII] line intensity (2)W.m**-2spect.line.intensitydoublenullablee_NeII? Uncertainty in NeIIW.m**-2stat.errordoublenullableNeIII? The [NeIII] line intensity (2)W.m**-2spect.line.intensitydoublenullablee_NeIII? Uncertainty in NeIII (1)W.m**-2stat.errordoublenullableSimbadSimbad column added by the CDSmeta.refchar