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PDRs4All: IV. An em...
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Chown, RyanWestern University
(author)
PDRs4All: IV. An embarrassment of riches: Aromatic infrared bands in the Orion Bar
- Article/chapterEnglish2024
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2024
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electronicrdacarrier
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LIBRIS-ID:oai:research.chalmers.se:8429884d-9925-45c5-86ac-99131f5e4e78
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https://research.chalmers.se/publication/541303URI
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https://doi.org/10.1051/0004-6361/202346662DOI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:art swepub-publicationtype
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Subject category:ref swepub-contenttype
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Context. Mid-infrared observations of photodissociation regions (PDRs) are dominated by strong emission features called aromatic infrared bands (AIBs). The most prominent AIBs are found at 3.3, 6.2, 7.7, 8.6, and 11.2 µm. The most sensitive, highest-resolution infrared spectral imaging data ever taken of the prototypical PDR, the Orion Bar, have been captured by JWST. These high-quality data allow for an unprecedentedly detailed view of AIBs. Aims. We provide an inventory of the AIBs found in the Orion Bar, along with mid-IR template spectra from five distinct regions in the Bar: the molecular PDR (i.e. the three H2 dissociation fronts), the atomic PDR, and the H II region. Methods. We used JWST NIRSpec IFU and MIRI MRS observations of the Orion Bar from the JWST Early Release Science Program, PDRs4All (ID: 1288). We extracted five template spectra to represent the morphology and environment of the Orion Bar PDR. We investigated and characterised the AIBs in these template spectra. We describe the variations among them here. Results. The superb sensitivity and the spectral and spatial resolution of these JWST observations reveal many details of the AIB emission and enable an improved characterization of their detailed profile shapes and sub-components. The Orion Bar spectra are dominated by the well-known AIBs at 3.3, 6.2, 7.7, 8.6, 11.2, and 12.7 µm with well-defined profiles. In addition, the spectra display a wealth of weaker features and sub-components. The widths of many AIBs show clear and systematic variations, being narrowest in the atomic PDR template, but showing a clear broadening in the H II region template while the broadest bands are found in the three dissociation front templates. In addition, the relative strengths of AIB (sub-)components vary among the template spectra as well. All AIB profiles are characteristic of class A sources as designated by Peeters (2022, A&A, 390, 1089), except for the 11.2 µm AIB profile deep in the molecular zone, which belongs to class B11.2. Furthermore, the observations show that the sub-components that contribute to the 5.75, 7.7, and 11.2 µm AIBs become much weaker in the PDR surface layers. We attribute this to the presence of small, more labile carriers in the deeper PDR layers that are photolysed away in the harsh radiation field near the surface. The 3.3/11.2 AIB intensity ratio decreases by about 40% between the dissociation fronts and the H II region, indicating a shift in the polycyclic aromatic hydrocarbon (PAH) size distribution to larger PAHs in the PDR surface layers, also likely due to the effects of photochemistry. The observed broadening of the bands in the molecular PDR is consistent with an enhanced importance of smaller PAHs since smaller PAHs attain a higher internal excitation energy at a fixed photon energy. Conclusions. Spectral-imaging observations of the Orion Bar using JWST yield key insights into the photochemical evolution of PAHs, such as the evolution responsible for the shift of 11.2 µm AIB emission from class B11.2 in the molecular PDR to class A11.2 in the PDR surface layers. This photochemical evolution is driven by the increased importance of FUV processing in the PDR surface layers, resulting in a “weeding out” of the weakest links of the PAH family in these layers. For now, these JWST observations are consistent with a model in which the underlying PAH family is composed of a few species: the so-called ‘grandPAHs’.
Subject headings and genre
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Sidhu, AmeekWestern University
(author)
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Peeters, ElsWestern University
(author)
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Tielens, A.G.G.M.Universiteit Leiden (UL),Leiden University (UL)
(author)
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Cami, JanWestern University
(author)
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Berné, O.Institut de Recherche en Astrophysique et Planétologie (IRAP)
(author)
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Habart, EmilieInstitut d'Astrophysique Spatiale
(author)
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Alarcon, FelipeUniversity of Michigan
(author)
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Canin, AmelieInstitut de Recherche en Astrophysique et Planétologie (IRAP)
(author)
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Schroetter, IlaneInstitut de Recherche en Astrophysique et Planétologie (IRAP)
(author)
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Trahin, BorisInstitut d'Astrophysique Spatiale
(author)
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Van De Putte, DriesSpace Telescope Science Institute (STScI)
(author)
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Abergel, AlainInstitut d'Astrophysique Spatiale
(author)
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Bergin, E. A.University of Michigan
(author)
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Bernard-Salas, J.Observatoire de la Cote d'Azur
(author)
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Boersma, ChristiaanNASA Ames Research Center
(author)
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Bron, E.Observatoire de Paris,Paris Observatory
(author)
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Cuadrado, S.CSIC - Instituto de Fisica Fundamental (IFF)
(author)
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Dartois, E.Université Paris-Saclay,University Paris-Saclay
(author)
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Dicken, D.Royal Observatory
(author)
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El-Yajouri, MeriemInstitut d'Astrophysique Spatiale
(author)
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Fuente, A.Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
(author)
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Goicoechea, J.R.CSIC - Instituto de Fisica Fundamental (IFF)
(author)
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Gordon, K.Space Telescope Science Institute (STScI)
(author)
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Issa, LinaInstitut de Recherche en Astrophysique et Planétologie (IRAP)
(author)
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Joblin, C.Universiteit Leiden (UL),Leiden University (UL)
(author)
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Kannavou, OlgaInstitut d'Astrophysique Spatiale
(author)
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Khan, BariaWestern University
(author)
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Lacinbala, OzanKatholieke Universiteit Leuven
(author)
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Languignon, DavidObservatoire de Paris,Paris Observatory
(author)
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Gal, R. Le
(author)
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Maragkoudakis, AlexandrosNASA Ames Research Center
(author)
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Meshaka, RaphaelInstitut d'Astrophysique Spatiale
(author)
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Okada, YokoUniversität zu Köln,University of Cologne
(author)
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Onaka, TakashiUniversity of Tokyo, Japan
(author)
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Pasquini, SofiaWestern University
(author)
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Pound, Marc W.University of Maryland
(author)
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Robberto, MassimoSpace Telescope Science Institute (STScI)
(author)
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Rollig, M.
(author)
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Schefter, BethanyWestern University
(author)
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Schirmer, ThiébautInstitut d'Astrophysique Spatiale
(author)
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Vicente, S.Instituto de Astrofísica e Ciências do Espaço (IA),Institute of Astrophysics and Space Sciences (IA)
(author)
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Wolfire, M.G.University of Maryland
(author)
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Zannese, MarionInstitut d'Astrophysique Spatiale
(author)
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Aleman, I.Universidade Federal de Itajuba,Federal University of Itajubá
(author)
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Allamandola, LouisNASA Ames Research Center
(author)
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Auchettl, RebeccaAustralian Synchrotron (ANSTO)
(author)
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Baratta, Giuseppe AntonioIstituto nazionale di astrofisica (INAF)
(author)
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Bejaoui, SalmaNASA Ames Research Center
(author)
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Bera, Partha P.NASA Ames Research Center
(author)
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Black, John H,1949Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)jblack
(author)
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Boulanger, F.
(author)
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Bouwman, JordyUniversity of Colorado at Boulder
(author)
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Brandl, B. R.Universiteit Leiden (UL),Leiden University (UL)
(author)
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Brechignac, PhilippeUniversité Paris-Saclay,University Paris-Saclay
(author)
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Brünken, S.Radboud Universiteit,Radboud University
(author)
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Buragohain, MridusmitaUniversity of Hyderabad
(author)
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Burkhardt, Andrew
(author)
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Candian, AlessandraAnton Pannekoek Institute for Astronomy
(author)
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Cazaux, S.Technische Universiteit Delft,Delft University of Technology (TU Delft)
(author)
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Cernicharo, JoseCSIC - Instituto de Fisica Fundamental (IFF)
(author)
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Chabot, MarinUniversité Paris-Saclay,University Paris-Saclay
(author)
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Chakraborty, Shubhadip
(author)
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Champion, JasonInstitut de Recherche en Astrophysique et Planétologie (IRAP)
(author)
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Colgan, Sean W. J.NASA Ames Research Center
(author)
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Cooke, Ilsa R.University of British Columbia (UBC)
(author)
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Coutens, A.Institut de Recherche en Astrophysique et Planétologie (IRAP)
(author)
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Cox, N. L. J.Observatoire de la Cote d'Azur
(author)
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Demyk, K.Institut de Recherche en Astrophysique et Planétologie (IRAP)
(author)
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Meyer, Jennifer DonovanNational Radio Astronomy Observatory
(author)
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Foschino, SachaInstitut de Recherche en Astrophysique et Planétologie (IRAP)
(author)
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Garcia-Lario, P.European Space Astronomy Centre (ESAC)
(author)
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Gavilan, LissethNASA Ames Research Center
(author)
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Gerin, M.Observatoire de Paris,Paris Observatory
(author)
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Gottlieb, C. A.Harvard-Smithsonian Center for Astrophysics
(author)
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Guillard, P.Institut d 'Astrophysique de Paris
(author)
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Gusdorf, Antoine
(author)
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Hartigan, PatrickRice University
(author)
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He, J. H.Yunnan Observatories
(author)
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Herbst, EUniversity of Virginia
(author)
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Hornekaer, LivÅrhus Universitet,Aarhus University
(author)
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Jäger, CorneliaMax Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
(author)
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Janot-Pacheco, EduardoUniversidade de Sao Paulo (USP),University of Sao Paulo (USP)
(author)
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Kaufman, M.San Jose State University
(author)
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Kemper, F.Institut de Ciències de l'Espai (ICE) - CSIC,Institute of Space Sciences (ICE) - CSIC
(author)
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Kendrew, S.European Space Agency (ESA)
(author)
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Kirsanova, M. S.Russian Academy of Sciences
(author)
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Klaassen, PamelaRoyal Observatory
(author)
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Kwok, SunUniversity of British Columbia (UBC)
(author)
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Labiano, A.European Space Astronomy Centre (ESAC)
(author)
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Lai, ThomasCalifornia Institute of Technology (Caltech)
(author)
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Lee, Timothy J.NASA Ames Research Center
(author)
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Lefloch, B.
(author)
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Le Petit, Franck,1975Observatoire de Paris,Paris Observatory
(author)
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Li, AigenUniversity of Missouri
(author)
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Linz, H.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
(author)
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MacKie, Cameron J.Lawrence Berkeley National Laboratory
(author)
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Madden, S. C.Université Paris-Saclay,University Paris-Saclay
(author)
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Mascetti, Joëlle
(author)
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McGuire, BrettNational Radio Astronomy Observatory
(author)
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Merino, PabloCSIC - Instituto de Ciencia de Materiales de Madrid (ICMM)
(author)
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Micelotta, Elisabetta R.Helsingin Yliopisto,University of Helsinki
(author)
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Misselt, K. A.University of Arizona
(author)
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Morse, Jon A.
(author)
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Mulas, GiacomoInstitut de Recherche en Astrophysique et Planétologie (IRAP)
(author)
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Neelamkodan, Naslim
(author)
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Ohsawa, RyouNational Astronomical Observatory of Japan
(author)
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Omont, A.A.Institut d 'Astrophysique de Paris
(author)
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Paladini, R.California Institute of Technology (Caltech)
(author)
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Palumbo, Maria ElisabettaIstituto nazionale di astrofisica (INAF)
(author)
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Pathak, AmitBanaras Hindu University
(author)
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Pendleton, Yvonne J.University of Central Florida (UCF)
(author)
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Petrignani, AnnemiekeUniversiteit Van Amsterdam,University of Amsterdam
(author)
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Pino, ThomasUniversité Paris-Saclay,University Paris-Saclay
(author)
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Puga, E.European Space Agency (ESA)
(author)
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Rangwala, NaseemNASA Ames Research Center
(author)
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Rapacioli, Mathias
(author)
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Ricca, AlessandraSETI Institute
(author)
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Roman-Duval, J.Space Telescope Science Institute (STScI)
(author)
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Roser, JosephSETI Institute
(author)
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Roueff, EvelyneObservatoire de Paris,Paris Observatory
(author)
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Rouillé, GaëlMax Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
(author)
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Salama, FaridNASA Ames Research Center
(author)
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Sales, Dinalva A.
(author)
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Sandstrom, KarinUniversity of California at San Diego (UCSD)
(author)
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Sarre, PeterUniversity Of Nottingham
(author)
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Sciamma-O'Brien, EllaNASA Ames Research Center
(author)
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Sellgren, KrisOhio State University
(author)
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Shenoy, Sachindev S.Space Science Institute
(author)
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Teyssier, D.European Space Astronomy Centre (ESAC)
(author)
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Thomas, Richard D.Stockholms universitet,Stockholm University
(author)
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Togi, AdityaMax Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
(author)
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Verstraete, LaurentInstitut d'Astrophysique Spatiale
(author)
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Witt, Adolf N.Texas State University
(author)
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Wootten, A.National Radio Astronomy Observatory
(author)
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Zettergren, H.Stockholms universitet,Stockholm University
(author)
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Zhang, YongSun Yat-Sen University
(author)
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Zhang, Ziwei E.RIKEN
(author)
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Zhen, Junfeng
(author)
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Western UniversityUniversiteit Leiden (UL)
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