J/ApJ/719/1191ivo://CDS.VizieR/J/ApJ/719/1191doi:10.26093/cds/vizier.17191191CDSTreyer M.Schiminovich D.Johnson B.D.O'Dowd M.Martin C.D.Wyder T.,Charlot S.Heckman T.Martins L.Seibert M.van der Hulst J.M.2017-06-01T08:52:53Z2012-07-09T08:26:15ZCDS support team

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

cds-question@unistra.frgalaxiesinfrared-sourcesinfrared-astronomyspectroscopyinterstellar-mediumline-intensitiesWe investigate the use of mid-infrared (MIR) polycyclic aromatic hydrocarbon (PAH) bands, the continuum, and emission lines as probes of star formation (SF) and active galactic nucleus (AGN) activity in a sample of 100 "normal" and local (z~0.1) emission-line galaxies. The MIR spectra were obtained with the Spitzer Space Telescope Infrared Spectrograph as part of the Spitzer-SDSS-GALEX Spectroscopic Survey (SSGSS), which includes multi-wavelength photometry from the ultraviolet to the far-infrared and optical spectroscopy. The continuum and features were extracted using PAHFIT, a decomposition code which we find to yield PAH equivalent widths (EWs) up to ~30 times larger than the commonly used spline methods. Despite the lack of extreme objects in our sample (such as strong AGNs, low-metallicity galaxies, or ULIRGs), we find significant variations in PAH, continuum, and emission-line properties, and systematic trends between these MIR properties and optically derived physical properties, such as age, metallicity, and radiation field hardness. We revisit the diagnostic diagram relating PAH EWs and [NeII]12.8um/[OIV]25.9um line ratios and find it to be in much better agreement with the standard optical SF/AGN classification than when spline decompositions are used, while also potentially revealing obscured AGNs.2010ApJ...719.1191Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/719/1191CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/741/79 : The Spitzer-SDSS-GALEX Spectroscopic Survey (O'Dowd+, 2011)J/ApJ/705/885 : PAH in galaxies at z~0.1 (O'Dowd+, 2009)J/A+A/507/713 : Galaxies with strong PAH emission (Haas+, 2009)J/ApJ/686/127 : Starbursts luminosities based on PAH (Weedman+, 2008)http://www.astro.columbia.edu/ssgss : SSGSS home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/719/1191https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/719/1191http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/719/1191https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/719/1191https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/719/1191http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/719/1191GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/719/1191/pahcat (PAH, line fluxes and PAH equivalent widths)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/719/1191/pahcat?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/719/1191/pahcat?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/719/1191/pahcat?GETtext/xml+votable180.050000true160.3439858.892010.0055555555555555565/1519 6/6046 6047 6069 6070 6071 6073 6075 6112 6114 61206.772611666688002e-21 1.000830682546041e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/719/1191?format=asciiInfrareddefaultJ/ApJ/719/1191/pahcatPAH, line fluxes and PAH equivalent widthse_C24Uncertainty in C241e+10Jy.Hzstat.errorfloatC24Absorption corrected 24um continuum flux (1)1e+10Jy.Hzphot.fluxfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSSGSS[1/99] Identification numbermeta.id;meta.mainintC8Absorption corrected 8um continuum flux (1)1e+10Jy.Hzphot.fluxfloate_C8Uncertainty in C81e+10Jy.Hzstat.errorfloatC16Absorption corrected 16um continuum flux (1)1e+10Jy.Hzphot.fluxfloate_C16Uncertainty in C161e+10Jy.Hzstat.errorfloatP7.7PAH 7.7 micron flux1e+10Jy.Hzphot.fluxfloate_P7.7Uncertainty in PAH7.71e+10Jy.Hzstat.errorfloatP17PAH 17 micron flux1e+10Jy.Hzphot.fluxfloate_P17Uncertainty in PAH171e+10Jy.Hzstat.errorfloatL12.8The [NeII] 12.8 micron fluxphot.fluxfloate_L12.8Uncertainty in L12.8stat.errorfloatL15.5The [NeIII] 15.5 micron line fluxphot.fluxfloate_L15.5Uncertainty in L15.5stat.errorfloatL25.9The [OIV] 25.9 micron line fluxphot.fluxfloate_L25.9Uncertainty in L25.9stat.errorfloatLH2Sum of H_2_S(0) to S(2) lines fluxphot.fluxfloate_LH2Uncertainty in LH2stat.errorfloatAC8Spitzer/IRAC 8 micron aperture correctionmagphot.mag;arith.difffloatAC16Spitzer/IRS 16 micron aperture correctionmagphot.mag;arith.difffloatAC24Spitzer/MIPS 24 micron aperture correctionmagphot.mag;arith.difffloatW6.2PAH 6.2 micron feature equivalent widthumspect.line.eqWidthfloate_W6.2Uncertainty in W6.2umstat.errorfloatW7.7PAH 7.7 micron feature equivalent widthumspect.line.eqWidthfloate_W7.7Uncertainty in W7.7umstat.errorfloatW8.6PAH 8.6 micron feature equivalent widthumspect.line.eqWidthfloate_W8.6Uncertainty in W8.6umstat.errorfloatW11.3PAH 11.3 micron feature equivalent widthumspect.line.eqWidthfloate_W11.3Uncertainty in W11.3umstat.errorfloatW17PAH 17 micron feature equivalent widthumspect.line.eqWidthfloate_W17Uncertainty in W17umstat.errorfloatSimbadSimbad column added by the CDSmeta.refchar_RAPositions from SSGSS catalog, O'Dowd+, 2011, Cat. J/ApJ/741/79 (right ascension part)degpos.eq.ra;meta.main_DEPositions from SSGSS catalog, O'Dowd+, 2011, Cat. J/ApJ/741/79 (declination part)degpos.eq.dec;meta.main