J/MNRAS/507/6177ivo://CDS.VizieR/J/MNRAS/507/6177doi:10.26093/cds/vizier.75076177CDSCanelo C.M.Sales D.A.Friaca A.C.S.Pastoriza M.Menendez-Delmestre K.2024-11-06T20:34:25Z2024-09-11T10:10:26ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleih-ii-regionsgalaxiesinfrared-sourcesquasarsstar-forming-regionsseyfert-galaxiesastronomical-reference-materialsredshiftedspectroscopyphotometrymolecular-physicsclassificationPolycyclic aromatic hydrocarbons (PAHs) are of great astrochemical and astrobiological interest due to their potential to form prebiotic molecules. We analyse the 7.7 and 8.6{mu}m PAH bands in 126 pre-dominantly starburst- dominated galaxies extracted from the Spitzer/IRS ATLAS project. Based on the peak positions of these bands, we classify them into the different A, B, and C Peeters' classes, which allows us to address the potential characteristics of the PAH-emitting population. We compare this analysis with previous work focused on the 6.2{mu}m PAH band for the same sample. For the first time in the literature, this statistical analysis is performed on a sample of galaxies. In our sample, the 7.7{mu}m complex is equally distributed in A and B object's class while the 8.6{mu}m band presents more class B sources. Moreover, 39 per cent of the galaxies were distributed into A class objects for both 6.2 and 7.7 {mu}m bands and only 18 per cent received the same A classification for the three bands. The 'A A A' galaxies presented higher temperatures and less dust in their interstellar medium. Considering the redshift range covered by our sample, the distribution of the three bands into the different Peeters' classes reveals a potential cosmological evolution in the molecular nature of the PAHs that dominate the interstellar medium in these galaxies, where B class objects seem to be more frequent at higher redshifts and, therefore, further studies have to be addressed.2021MNRAS.507.6177Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/507/6177CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/414/500 : Spitzer/IRS ATLAS project source (Hernan-Caballero+, 2011)J/ApJ/658/778 : Spitzer mid-IR spectroscopy of z~2 ULIRGs (Yan+, 2007)J/ApJ/656/770 : Mid-IR spectrum of star-forming galaxies (Smith+, 2007)J/ApJ/693/370 : 24um flux-limited sample of galaxies (Weedman+, 2009)J/MNRAS/395/1695 : Spitzer mid-IR spectroscopy of LIRGsJ/ApJ/701/1123 : MIR spectroscopic catalog of 150 galaxies (Dasyra+, 2009)J/ApJ/653/127 : 9.7um silicate features in AGNs (Shi+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/507/6177https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/507/6177http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/507/6177https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/507/6177https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/507/6177http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/507/6177GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/507/6177/tablea1 (*Sources and their respective information)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/507/6177/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/507/6177/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/507/6177/tablea1?GETtext/xml+votable180.050000true208.074166731.446250.0055555555555555560/https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/507/6177?format=asciiInfrareddefaultJ/MNRAS/507/6177/tablea1*Sources and their respective informationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDObject name identifier (ID)meta.id;meta.maincharn_IDObjects with redshift obtained through the IRS Spitzer spectrum (n_ID)meta.notecharTypeObjects type (1)src.classcharRefLiterature reference (Reference)meta.ref;pos.framecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainzRedshift (z)src.redshiftfloatSimbadNameSimbad column added by the CDSmeta.idcharnullableJ/MNRAS/507/6177/tablec1*Best-fitting results for the 7.7 and 8.6 {mu}m PAH bandse_FWHMMean error of FWHM (Err_FWHM)umstat.error;phys.angSizefloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDObject name identifier (ID)meta.id;meta.maincharLambdacCentral wavelength ({lambda}_c_)umem.wl.centralfloate_LambdacMean error of Lambdac (Err_{lambda}_c_)umstat.errorfloatAMonochromatic flux density amplitude per unit solid angle (A)mJy/srphot.flux.densityfloate_AMean error on A (Err_A)mJy/srstat.errorfloatFWHMFull width at half-maximum (FWHM)umspect.line.widthfloatJ/MNRAS/507/6177/tablec2*Integrated flux intensities for the 6.2, 7.7, and 8.6{mu}m PAH bandsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDObject name identifier (ID)meta.id;meta.maincharF6.2Monochromatic flux density amplitude at 6.2 {mu}m per unit solid angle (F6.2)mJy/srphot.flux.density;em.IR.4-8umfloate_F6.2Mean error on F6.2 (Err_F6.2)mJy/srstat.errorfloatF7.6Monochromatic flux density amplitude at 7.6 {mu}m per unit solid angle (F7.6)mJy/srphot.flux.density;em.IRfloate_F7.6Mean error on F7.6 (Err_F7.6)mJy/srstat.errorfloatF7.8Monochromatic flux density amplitude at 7.8 {mu}m per unit solid angle (F7.8)mJy/srphot.flux.density;em.IRfloate_F7.8Mean error on F7.8 (Err_F7.8)mJy/srstat.errorfloatF8.6Monochromatic flux density amplitude at 8.6 {mu}m per unit solid angle (F8.6)mJy/srphot.flux.density;em.IR.8-15umfloate_F8.6Mean error on F8.6 (F8.6)mJy/srstat.errorfloatJ/MNRAS/507/6177/tablec3*Distribution of the galaxies into the Peeters' classes for three PAH bandsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDObject name identifier (ID)meta.id;meta.mainchar6.2um[A/B/C] Peeters' class for the 6.2{mu}m PAH feature (6.2um) (1)src.classchar7.7um[A/B/C] Peeters' class for the 7.6um 7.8um PAH features (7.7um) (2)src.classchar8.6um[A/B] Peeters' class for the 8.6um PAH feature (8.6um) (3)src.classchar