J/ApJ/790/124ivo://CDS.VizieR/J/ApJ/790/124doi:10.26093/cds/vizier.17900124CDSStierwalt S.Armus L.Charmandaris V.Diaz-Santos T.Marshall J.,Evans A.S.Haan S.Howell J.Iwasawa K.Kim D.C.Murphy E.J.,Rich J.A.Spoon H.W.W.Inami H.Petric A.O.U V.2021-12-13T06:47:30Z2017-03-27T13:57:41ZCDS support team

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

cds-question@unistra.frsurveysgalaxiesinfrared-sourcesline-intensitiesinfrared-astronomyspectroscopyThe Great Observatories All-sky LIRG Survey (GOALS) is a comprehensive, multiwavelength study of luminous infrared galaxies (LIRGs) in the local universe. Here, we present the results of a multi-component, spectral decomposition analysis of the low-resolution mid-infrared (MIR) Spitzer Infrared Spectrograph spectra from 5-38 {mu}m of 244 LIRG nuclei. The detailed fits and high-quality spectra allow for characterization of the individual polycyclic aromatic hydrocarbon (PAH) features, warm molecular hydrogen emission, and optical depths for both silicate dust grains and water ices. We find that starbursting LIRGs, which make up the majority of the GOALS sample, are very consistent in their MIR properties (i.e., {tau}_9.7 {mu}m_, {tau}_ice_, neon line ratios, and PAH feature ratios). However, as their EQW_6.2 {mu}m_decreases, usually an indicator of an increasingly dominant active galactic nucleus (AGN), LIRGs cover a larger spread in these MIR parameters. The contribution from PAH emission to the total IR luminosity (L(PAH)/L(IR)) in LIRGs varies from 2%-29% and LIRGs prior to their first encounter show significantly higher L(PAH)/L(IR) ratios on average. We observe a correlation between the strength of the starburst (represented by IR8 = L_IR_/L_8 {mu}m_) and the PAH fraction at 8 {mu}m but no obvious link between IR8 and the 7.7 to 11.3 PAH ratio, suggesting that the fractional photodissociation region (PDR) emission, and not the overall grain properties, is associated with the rise in IR8 for galaxies off the starburst main sequence. We detect crystalline silicate features in ~6% of the sample but only in the most obscure sources (s_9.7 {mu}m_< -1.24). Ice absorption features are observed in ~11% (56%) of GOALS LIRGs (ULIRGs) in sources with a range of silicate depths. Most GOALS LIRGs have L(H_2_)/L(PAH) ratios elevated above those observed for normal star-forming galaxies and exhibit a trend for increasing L(H_2_)/L(PAH) ratio with increasing L(H_2_). While star formation appears to be the dominant process responsible for exciting the H_2_ in most of the GOALS galaxies, a subset of LIRGs (~10%) shows excess H_2_emission that is inconsistent with PDR models and may be excited by shocks or AGN-induced outflows.2014ApJ...790..124Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/790/124CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/395/1695 : Spitzer mid-IR spectroscopy of LIRGsJ/ApJ/715/572 : GOALS UV and FIR properties (Howell+, 2010)J/ApJ/741/32 : Spatial extent of (U)LIRGs in the MIR. II.J/AJ/144/148 : Infrared photometry of brown dwarf and Hyper-LIRGJ/ApJS/206/1 : Mid-IR properties of GOALS nearby LIRGs (Stierwalt+, 2013)J/A+A/590/A67 : Ionized gas maps of local U/LIRGs (Piqueras-Lopez+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/790/124https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/790/124http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/790/124https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/790/124https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/790/124http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/790/124GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/790/124/table12 (Fitted Mid-IR Spectral Parameters (table 1) and H_2_ Line Fluxes (table 2) for the GOALS Sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/790/124/table12?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/790/124/table12?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/790/124/table12?GETtext/xml+votable180.050000true2.472545825.92373890.0055555555555555566/226 231 286 295 538 627 629 650 700 1276 1521 1677 1701-1702 1865 1918 2309 2363 2433 2518 2680 3364 3446 3824 3934 4993 5116 5130 5523 5816 5865 6098 6348 6781 7552 7763 8106 8111 8266 8482 8562 8673 8997 9133 9770 9895 10081 10144 10210 10281 10404 10453 10465 10628 10716 11029 11101 11180 11206 11908 12537 13021 13184 13523 13632 14164 15323 15333 15570 16016 16045 16690 16755 16758 17075 17183 17252 17492 17506 17736 17904 18406 18432 18714 18753 18897 18932 19283 19619 20060-20061 20118 20208 20254 20371 20895-20896 21016 21416 21747 22468 22721 22792 23339 23921 24123 24144 24163 24232 24293 24584 24631 24855 24958 25462 25610 26028 26035 26198 26264 26298 26324 26811 26932 27340 27537 28188 28393 28999 29439 29680 29937 30027 30383 30580 30810 30822 30879 31081 31158 31430 31503 32187 32548 32740 34010 34397 34531 34627 34695 35067 35576 35602 35608 37113 37559 37564 37821 38129 38139 38246 38285 38786 38935 39472 39960 40082 40801 41276 41402 41430 42010 42855 43078 43082 43107 43147 43298 43389 43564 43925 43994 44626 44671 45387 46077 46079 46130 46296 46399 46794 46811 46882 47029 47162 47235 47543 47854 48665https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/790/124?format=asciiInfrareddefaultJ/ApJ/790/124/table12Fitted Mid-IR Spectral Parameters (table 1) and H_2_ Line Fluxes (table 2) for the GOALS SampleSimbadNameSimbad column added by the CDSmeta.idcharnullableNameSource namemeta.id;meta.maincharl_LPAHLimit flag on LPAHmeta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintf_Name[*,** ] Flag on Name (G1)meta.codecharl_EQW6.2Limit flag on EQW6.2meta.code.errorcharEQW6.2? 6.2 micron PAH equivalent width (2)umspect.line.eqWidth;em.IR.4-8umfloatnullablee_EQW6.2? Uncertainty in EQW6.2umstat.errorfloatnullablef_EQW6.2[i] Flag on EQW6.2 (2)meta.codecharl_6.2PAHLimit flag on 6.2PAHmeta.code.errorchar6.2PAH? 6.2 micron PAH feature flux (3)1e-15W.m**-2phot.flux.density;em.IR.4-8umfloatnullablee_6.2PAH? Uncertainty in 6.2PAH (3)1e-15W.m**-2stat.errorfloatnullable7.7PAH? 7.7 micron complex PAH feature flux (3)1e-15W.m**-2phot.flux.density;em.IR.4-8umfloatnullablee_7.7PAH? Uncertainty in 7.7PAH (3)1e-15W.m**-2stat.errorfloatnullable11.3PAH? 11.3 micron complex PAH feature flux (3)1e-15W.m**-2phot.flux.density;em.IR.8-15umfloatnullablee_11.3PAH? Uncertainty in 11.3PAH (3)1e-15W.m**-2stat.errorfloatnullablel_17PAHLimit flag on 17PAHmeta.code.errorchar17PAH? 17 micron complex PAH feature flux (3)1e-15W.m**-2phot.flux.density;em.IR.15-30umfloatnullablee_17PAH? Uncertainty in 17PAH (3)1e-15W.m**-2stat.errorfloatnullableLPAH? PAH luminosity (4)1e+09solLumphot.flux.density;em.IRfloatnullablee_LPAH? Uncertainty in LPAH1e+09solLumstat.errorfloatnullabletauice? 6.0 micron ice feature optical depth (4)phys.absorption.opticalDepthfloatnullablee_tauice? Uncertainty in tauicestat.errorfloatnullabletau9.7? 9.7 micron silicate feature optical depth (4)phys.absorption.opticalDepthfloatnullablee_tau9.7? Uncertainty in tau9.7stat.errorfloatnullableeta? Measure of total-to-slit flux ratio at 8 microns (5)phot.flux;arith.ratiofloatnullablee_eta? Uncertainty in etastat.error;phys.electron.degenfloatnullablel_H2S-0The 3{sigma} upper limit flag on H2S-0meta.code.errorcharH2S-0? H_2_S-0 line feature flux (2)1e-16W.m**-2phot.flux;spect.linefloatnullablee_H2S-0? Uncertainty in H2S-01e-16W.m**-2stat.errorfloatnullablel_H2S-1The 3{sigma} upper limit flag on H2S-1meta.code.errorcharH2S-1? H_2_S-1 line feature flux (2)1e-16W.m**-2phot.flux;spect.linedoublenullablee_H2S-1? Uncertainty in H2S-11e-16W.m**-2stat.errorfloatnullablel_H2S-2The 3{sigma} upper limit flag on H2S-2meta.code.errorcharH2S-2? H_2_S-2 line feature flux (2)1e-16W.m**-2phot.flux;spect.linefloatnullablee_H2S-2? Uncertainty in H2S-21e-16W.m**-2stat.errorfloatnullablel_H2S-3The 3{sigma} upper limit flag on H2S-3meta.code.errorcharH2S-3? H_2_S-3 line feature flux (2)1e-16W.m**-2phot.flux;spect.linefloatnullablee_H2S-3? Uncertainty in H2S-31e-16W.m**-2stat.errorfloatnullablel_H2S-4The 3{sigma} upper limit flag on H2S-4meta.code.errorcharH2S-4? H_2_S-4 line feature flux (2)1e-16W.m**-2phot.flux;spect.linefloatnullablee_H2S-4? Uncertainty in H2S-41e-16W.m**-2stat.errorfloatnullablel_H2S-5The 3{sigma} upper limit flag on H2S-5meta.code.errorcharH2S-5? H_2_S-5 line feature flux (2)1e-16W.m**-2phot.flux;spect.linefloatnullablee_H2S-5? Uncertainty in H2S-51e-16W.m**-2stat.errorfloatnullablel_H2S-6The 3{sigma} upper limit flag on H2S-6meta.code.errorcharH2S-6? H_2_S-6 line feature flux (2)1e-16W.m**-2phot.flux;spect.linefloatnullablee_H2S-6? Uncertainty in H2S-61e-16W.m**-2stat.errorfloatnullablel_H2S-7The 3{sigma} upper limit flag on H2S-7meta.code.errorcharH2S-7? H_2_S-7 line feature flux (2)1e-16W.m**-2phot.flux;spect.linefloatnullablee_H2S-7? Uncertainty in H2S-71e-16W.m**-2stat.errorfloatnullable_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