J/ApJ/803/109ivo://CDS.VizieR/J/ApJ/803/109doi:10.26093/cds/vizier.18030109CDSHernan-Caballero A.Alonso-Herrero A.Hatziminaoglou E.Spoon H.W.W.,Ramos Almeida C.Diaz Santos T.Honig S.F.Gonzalez-Martin O.Esquej P.2022-06-21T16:08:29Z2015-09-03T08:58:03ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiinfrared-astronomyspectroscopyastronomical-modelsWe present results on the spectral decomposition of 118 Spitzer Infrared Spectrograph (IRS) spectra from local active galactic nuclei (AGNs) using a large set of Spitzer/IRS spectra as templates. The templates are themselves IRS spectra from extreme cases where a single physical component (stellar, interstellar, or AGN) completely dominates the integrated mid-infrared emission. We show that a linear combination of one template for each physical component reproduces the observed IRS spectra of AGN hosts with unprecedented fidelity for a template fitting method with no need to model extinction separately. We use full probability distribution functions to estimate expectation values and uncertainties for observables, and find that the decomposition results are robust against degeneracies. Furthermore, we compare the AGN spectra derived from the spectral decomposition with sub-arcsecond resolution nuclear photometry and spectroscopy from ground-based observations. We find that the AGN component derived from the decomposition closely matches the nuclear spectrum with a 1{sigma} dispersion of 0.12dex in luminosity and typical uncertainties of ~0.19 in the spectral index and ~0.1 in the silicate strength. We conclude that the emission from the host galaxy can be reliably removed from the IRS spectra of AGNs. This allows for unbiased studies of the AGN emission in intermediate- and high-redshift galaxies--currently inaccesible to ground-based observations--with archival Spitzer/IRS data and in the future with the Mid-InfraRed Instrument of the James Webb Space Telescope.2015ApJ...803..109Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/803/109CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/439/1648 : Subarcsecond mid-infrared atlas of local AGN (Asmus+, 2014)J/MNRAS/414/500 : Spitzer/IRS ATLAS project source (Hernan-Caballero+, 2011)J/ApJ/709/1257 : Spitzer-IRS spectra of Seyfert gal. II. (Tommasin+, 2010)J/MNRAS/398/1165 : AGN in nearby galaxies (Goulding+, 2009)J/ApJS/182/628 : Spitzer quasar and ULIRG evolution study (Veilleux+, 2009)J/MNRAS/395/1695 : Spitzer MIR spectroscopy of LIRGs (Hernan-Caballero+, 2009)J/MNRAS/386/1252 : SWIRE/SDSS quasars (Hatziminaoglou+, 2008)J/ApJ/656/770 : Mid-IR spectrum of star-forming galaxies (Smith+, 2007)J/A+A/418/465 : Mid-infrared and hard X-ray emission in AGN (Lutz+, 2004)http://denebola.org/ahc/deblendIRS/ : Decomposition code and templateshttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/803/109https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/803/109http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/803/109https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/803/109https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/803/109http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/803/109GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/803/109/results (AGN properties derived from decomposition and parameters for best-fitting model (tables 2 and 1))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/803/109/results?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/803/109/results?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/803/109/results?GETtext/xml+votable180.050000true63.0810244-28.50692580.0055555555555555566/650 1701 4439 4447 4993 5091 5116 5975 7552 7659 7869 8264 8299 8492 8675 8922 9770 10265 10355 10364 10454 10465 10817 10912 10927 10977 11029 12241 12335 12380 13707 14744 14858 16301 16690 16712 17525 17727 17814 17819 17850 18017 18365 18432 18484 18524 18683 18895 18897 19283 19373 19376 19433 19611 19730 19746 19932 20000 20489 21016 21036 21450 22721 22890 22912 23323 24842 25182 25610 25790 25890 25907 26028 26148 26264 26292 26338 26365 26393 26547 26937 27191 27515 27699 27714 27719 27721 27765 27767 27773 28075 28184 28249 28535 29795 31158 31352 33716 33954 34111 34273 34343 34531 34534 34695 34737 34881 34913 35246 35608 35623 35993 36158 36785 36896 38268 38653 38704 38868 38948 39836 40221 40410 40777 40818 41586 41982 42016 42027 43233 43262 43339 43634 43677 43806 43877 43925 44551 44660 45587 45735 45883 46079 46399 46568 46615 46811 46987 47047 47107 47120 47154 47169 47325 49042https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/803/109?format=asciiInfrareddefaultJ/ApJ/803/109/resultsAGN properties derived from decomposition and parameters for best-fitting model (tables 2 and 1)SimbadNameSimbad column added by the CDSmeta.idcharnullableSsil[-4/0.5] AGN Silicate 9.7{mu}m strengthspect.line.intensityfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameNED Namemeta.id;meta.maincharzsp[0.0002/0.3] Spectroscopic Redshift (G1)src.redshiftfloatlogL6[37.5/46] Monochromatic AGN luminosity at 6umlog(1e-07W)phys.luminosity;em.IR.4-8umfloatb_logL6[37/46]? The 1{sigma} lower value in logL6log(1e-07W)phys.luminosity;em.IR.4-8um;stat.minfloatnullablel_logL6Limit Flag on logL6 (2)meta.code.errorcharB_logL6[37.6/46] The 1{sigma} upper value in logL6log(1e-07W)phys.luminosity;em.IR.4-8um;stat.maxfloatlogL12[37.3/46] Monochromatic AGN luminosity at 12umlog(1e-07W)phys.luminosity;em.IR.8-15umfloatb_logL12? 1{sigma} lower value in logL12log(1e-07W)phys.luminosity;em.IR.8-15um;stat.minfloatnullablel_logL12Limit Flag on logL12 (2)meta.code.errorcharB_logL12The 1{sigma} upper value in logL12log(1e-07W)phys.luminosity;em.IR.8-15um;stat.maxfloatalpha[-3/0.8] AGN Emission spectral 8.1-12.5um indexspect.index;em.IR.8-15umfloatb_alphaThe 1{sigma} lower value in alphapos.eq.ra;stat.minfloatB_alphaThe 1{sigma} upper value in alphapos.eq.ra;stat.maxfloatb_SsilThe 1{sigma} lower value in Ssilmeta.notefloatB_SsilThe 1{sigma} upper value in Ssilmeta.notefloatPAHPAH template galaxy namemeta.idcharfPAH[0/1] PAH fraction in mid-IR integrated luminositystat.fit.paramfloatAGNAGN template galaxy namemeta.idcharfAGN[0/1] AGN fraction in mid-IR integrated luminositystat.fit.paramfloatSTRStellar template galaxy namemeta.idcharfSTR[0/1] STR fraction in mid-IR integrated luminositystat.fit.paramfloatchi2r[0/126] Reduced {chi}^2^ of decomposition fitstat.fit.chi2floatCVrmse[0/0.52] Coefficient of variation of rmse (1)stat.stdevfloatNEDNED column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main