J/A+A/710/A60ivo://CDS.VizieR/J/A+A/710/A60CDSVan De Putte D.Gordon K.D.Misselt K.Witt A.N.Abergel A.,Noriega-Crespo A.Guillard P.Zannese M.Elyajouri M.Trahin B.,Dell'ova P.Baes M.Klaassen P.2026-06-01T07:45:20Z2026-06-01T08:44:34ZCDS support team

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

cds-question@unistra.fropen-star-clustersinterstellar-mediuminfrared-sourcesspectroscopyThe northwest photodissociation region (PDR) of the NGC 7023 reflection nebula has been observed with JWST spectroscopy, revealing the carbonaceous emission bands at a high level of detail. Compared to other PDRs (Horsehead and Orion Bar) the softer radiation field driving NGC 7023 results in an extended atomic hydrogen region and more pronounced spatial variations in the band profiles. Its weaker thermal dust continuum makes NGC 7023 an ideal target for studying the 6-18um emission and its relation to the main emission bands at 3.3, 3.4, 5.2, 5.7, 6.2, 7.7, 8.6, 11.3, and 12.7um. We performed a spatially resolved study to reveal which emission bands originate from the same or cospatial populations of small carbonaceous emitters. We applied a spectral decomposition with PAHFIT to around 500 extracted spectra and produced maps of the individual subcomponents of the carbonaceous emission bands. The spatial resolution of around 0.7 mpc effectively resolved the dissociation front. Nearly all emission maps peak at the dissociation front (DF1), while the relative intensity in the atomic hydrogen region (ATM) varies strongly. We classify the features into spatial distribution types based on the intensity ratio in ATM relative to DF1. Most bands are of type I (low ATM/DF1; 3.3, 3.4, 5.2, 5.7, 11.3um) or II (medium ATM/DF1; 16.2, 7.7, 8.6, 12.7, 16.4um), while only few are of type III (high ATM/DF1; 11.0, 17.4um). A breakdown of the 5.7, 7.7, 11.3 and 12.7um bands into blue and red sub-components reveals that contributions on the blue side are of type III, while those on the red side are of type I or II. These strongly differing spatial distributions reveal that at least two different populations contribute to the 16-18um range, and that these populations are also connected to the profiles of the 5.7, 7.7, 11.3, and 12.7um bands. The maps further indicate a continued evolution of these profiles toward the central cavity of NGC7023, where fullerene emission (C60) was previously detected. We speculate that the population of emission carriers could be in an intermediate photochemical evolution stage that precedes fullerene formation.2026A&A...710A..60Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/710/A60CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/701/A111 : PDRs4All XVI. Orion Bar template spectra (Van De Putte+, 2025)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/710/A60https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/710/A60http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/710/A60https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/710/A60https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/710/A60http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/710/A60GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/710/A60/maps (Table with coordinates and fit results for the spaxels)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/710/A60/maps?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/710/A60/maps?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/710/A60/maps?GETtext/xml+votable180.050000true315.3920261168.171763890.0055555555555555566/16131https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/710/A60?format=asciiInfrareddefaultJ/A+A/710/A60/mapsTable with coordinates and fit results for the spaxelsX[0/8] X pixelpos.cartesian.xintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintY[0/51] Y pixelpos.cartesian.yintRAJ2000[] Right ascension (J2000) of pixeldegpos.eq.ra;meta.mainDEJ2000Declination (J2000) of pixeldegpos.eq.dec;meta.main3.2PAHFIT feature power in 3.2 band1e-10W.m**-2.sr**-1spect.line.intensitydouble3.3APAHFIT feature power in 3.3A band1e-10W.m**-2.sr**-1spect.line.intensitydouble3.3BPAHFIT feature power in 3.3B band1e-10W.m**-2.sr**-1spect.line.intensitydouble3.4APAHFIT feature power in 3.4A band1e-10W.m**-2.sr**-1spect.line.intensitydouble3.4BPAHFIT feature power in 3.4B band1e-10W.m**-2.sr**-1spect.line.intensitydouble3.42PAHFIT feature power in 3.42 band1e-10W.m**-2.sr**-1spect.line.intensitydouble3.46PAHFIT feature power in 3.46 band1e-10W.m**-2.sr**-1spect.line.intensitydouble3.52PAHFIT feature power in 3.52 band1e-10W.m**-2.sr**-1spect.line.intensitydouble3.56PAHFIT feature power in 3.56 band1e-10W.m**-2.sr**-1spect.line.intensitydouble3.8PAHFIT feature power in 3.8 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