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| Fältnamn | Indikatorer | Metadata |
|---|---|---|
| 000 | 15255naa a2202017 4500 | |
| 001 | oai:research.chalmers.se:8429884d-9925-45c5-86ac-99131f5e4e78 | |
| 003 | SwePub | |
| 008 | 240526s2024 | |||||||||||000 ||eng| | |
| 024 | 7 | a https://research.chalmers.se/publication/5413032 URI |
| 024 | 7 | a https://doi.org/10.1051/0004-6361/2023466622 DOI |
| 040 | a (SwePub)cth | |
| 041 | a engb eng | |
| 042 | 9 SwePub | |
| 072 | 7 | a art2 swepub-publicationtype |
| 072 | 7 | a ref2 swepub-contenttype |
| 100 | 1 | a Chown, Ryanu Western University4 aut |
| 245 | 1 0 | a PDRs4All: IV. An embarrassment of riches: Aromatic infrared bands in the Orion Bar |
| 264 | 1 | c 2024 |
| 338 | a electronic2 rdacarrier | |
| 520 | a 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’. | |
| 650 | 7 | a NATURVETENSKAPx Fysikx Astronomi, astrofysik och kosmologi0 (SwePub)103052 hsv//swe |
| 650 | 7 | a NATURAL SCIENCESx Physical Sciencesx Astronomy, Astrophysics and Cosmology0 (SwePub)103052 hsv//eng |
| 653 | a ISM: individual objects: Orion Bar | |
| 653 | a Infrared: ISM | |
| 653 | a Astrochemistry | |
| 653 | a Photon-dominated region (PDR) | |
| 653 | a Techniques: spectroscopic | |
| 653 | a ISM: molecules | |
| 700 | 1 | a Sidhu, Ameeku Western University4 aut |
| 700 | 1 | a Peeters, Elsu Western University4 aut |
| 700 | 1 | a Tielens, A.G.G.M.u Universiteit Leiden (UL),Leiden University (UL)4 aut |
| 700 | 1 | a Cami, Janu Western University4 aut |
| 700 | 1 | a Berné, O.u Institut de Recherche en Astrophysique et Planétologie (IRAP)4 aut |
| 700 | 1 | a Habart, Emilieu Institut d'Astrophysique Spatiale4 aut |
| 700 | 1 | a Alarcon, Felipeu University of Michigan4 aut |
| 700 | 1 | a Canin, Amelieu Institut de Recherche en Astrophysique et Planétologie (IRAP)4 aut |
| 700 | 1 | a Schroetter, Ilaneu Institut de Recherche en Astrophysique et Planétologie (IRAP)4 aut |
| 700 | 1 | a Trahin, Borisu Institut d'Astrophysique Spatiale4 aut |
| 700 | 1 | a Van De Putte, Driesu Space Telescope Science Institute (STScI)4 aut |
| 700 | 1 | a Abergel, Alainu Institut d'Astrophysique Spatiale4 aut |
| 700 | 1 | a Bergin, E. A.u University of Michigan4 aut |
| 700 | 1 | a Bernard-Salas, J.u Observatoire de la Cote d'Azur4 aut |
| 700 | 1 | a Boersma, Christiaanu NASA Ames Research Center4 aut |
| 700 | 1 | a Bron, E.u Observatoire de Paris,Paris Observatory4 aut |
| 700 | 1 | a Cuadrado, S.u CSIC - Instituto de Fisica Fundamental (IFF)4 aut |
| 700 | 1 | a Dartois, E.u Université Paris-Saclay,University Paris-Saclay4 aut |
| 700 | 1 | a Dicken, D.u Royal Observatory4 aut |
| 700 | 1 | a El-Yajouri, Meriemu Institut d'Astrophysique Spatiale4 aut |
| 700 | 1 | a Fuente, A.u Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)4 aut |
| 700 | 1 | a Goicoechea, J.R.u CSIC - Instituto de Fisica Fundamental (IFF)4 aut |
| 700 | 1 | a Gordon, K.u Space Telescope Science Institute (STScI)4 aut |
| 700 | 1 | a Issa, Linau Institut de Recherche en Astrophysique et Planétologie (IRAP)4 aut |
| 700 | 1 | a Joblin, C.u Universiteit Leiden (UL),Leiden University (UL)4 aut |
| 700 | 1 | a Kannavou, Olgau Institut d'Astrophysique Spatiale4 aut |
| 700 | 1 | a Khan, Bariau Western University4 aut |
| 700 | 1 | a Lacinbala, Ozanu Katholieke Universiteit Leuven4 aut |
| 700 | 1 | a Languignon, Davidu Observatoire de Paris,Paris Observatory4 aut |
| 700 | 1 | a Gal, R. Le4 aut |
| 700 | 1 | a Maragkoudakis, Alexandrosu NASA Ames Research Center4 aut |
| 700 | 1 | a Meshaka, Raphaelu Institut d'Astrophysique Spatiale4 aut |
| 700 | 1 | a Okada, Yokou Universität zu Köln,University of Cologne4 aut |
| 700 | 1 | a Onaka, Takashiu University of Tokyo, Japan4 aut |
| 700 | 1 | a Pasquini, Sofiau Western University4 aut |
| 700 | 1 | a Pound, Marc W.u University of Maryland4 aut |
| 700 | 1 | a Robberto, Massimou Space Telescope Science Institute (STScI)4 aut |
| 700 | 1 | a Rollig, M.4 aut |
| 700 | 1 | a Schefter, Bethanyu Western University4 aut |
| 700 | 1 | a Schirmer, Thiébautu Institut d'Astrophysique Spatiale4 aut |
| 700 | 1 | a Vicente, S.u Instituto de Astrofísica e Ciências do Espaço (IA),Institute of Astrophysics and Space Sciences (IA)4 aut |
| 700 | 1 | a Wolfire, M.G.u University of Maryland4 aut |
| 700 | 1 | a Zannese, Marionu Institut d'Astrophysique Spatiale4 aut |
| 700 | 1 | a Aleman, I.u Universidade Federal de Itajuba,Federal University of Itajubá4 aut |
| 700 | 1 | a Allamandola, Louisu NASA Ames Research Center4 aut |
| 700 | 1 | a Auchettl, Rebeccau Australian Synchrotron (ANSTO)4 aut |
| 700 | 1 | a Baratta, Giuseppe Antoniou Istituto nazionale di astrofisica (INAF)4 aut |
| 700 | 1 | a Bejaoui, Salmau NASA Ames Research Center4 aut |
| 700 | 1 | a Bera, Partha P.u NASA Ames Research Center4 aut |
| 700 | 1 | a Black, John H,d 1949u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)jblack |
| 700 | 1 | a Boulanger, F.4 aut |
| 700 | 1 | a Bouwman, Jordyu University of Colorado at Boulder4 aut |
| 700 | 1 | a Brandl, B. R.u Universiteit Leiden (UL),Leiden University (UL)4 aut |
| 700 | 1 | a Brechignac, Philippeu Université Paris-Saclay,University Paris-Saclay4 aut |
| 700 | 1 | a Brünken, S.u Radboud Universiteit,Radboud University4 aut |
| 700 | 1 | a Buragohain, Mridusmitau University of Hyderabad4 aut |
| 700 | 1 | a Burkhardt, Andrew4 aut |
| 700 | 1 | a Candian, Alessandrau Anton Pannekoek Institute for Astronomy4 aut |
| 700 | 1 | a Cazaux, S.u Technische Universiteit Delft,Delft University of Technology (TU Delft)4 aut |
| 700 | 1 | a Cernicharo, Joseu CSIC - Instituto de Fisica Fundamental (IFF)4 aut |
| 700 | 1 | a Chabot, Marinu Université Paris-Saclay,University Paris-Saclay4 aut |
| 700 | 1 | a Chakraborty, Shubhadip4 aut |
| 700 | 1 | a Champion, Jasonu Institut de Recherche en Astrophysique et Planétologie (IRAP)4 aut |
| 700 | 1 | a Colgan, Sean W. J.u NASA Ames Research Center4 aut |
| 700 | 1 | a Cooke, Ilsa R.u University of British Columbia (UBC)4 aut |
| 700 | 1 | a Coutens, A.u Institut de Recherche en Astrophysique et Planétologie (IRAP)4 aut |
| 700 | 1 | a Cox, N. L. J.u Observatoire de la Cote d'Azur4 aut |
| 700 | 1 | a Demyk, K.u Institut de Recherche en Astrophysique et Planétologie (IRAP)4 aut |
| 700 | 1 | a Meyer, Jennifer Donovanu National Radio Astronomy Observatory4 aut |
| 700 | 1 | a Foschino, Sachau Institut de Recherche en Astrophysique et Planétologie (IRAP)4 aut |
| 700 | 1 | a Garcia-Lario, P.u European Space Astronomy Centre (ESAC)4 aut |
| 700 | 1 | a Gavilan, Lissethu NASA Ames Research Center4 aut |
| 700 | 1 | a Gerin, M.u Observatoire de Paris,Paris Observatory4 aut |
| 700 | 1 | a Gottlieb, C. A.u Harvard-Smithsonian Center for Astrophysics4 aut |
| 700 | 1 | a Guillard, P.u Institut d 'Astrophysique de Paris4 aut |
| 700 | 1 | a Gusdorf, Antoine4 aut |
| 700 | 1 | a Hartigan, Patricku Rice University4 aut |
| 700 | 1 | a He, J. H.u Yunnan Observatories4 aut |
| 700 | 1 | a Herbst, Eu University of Virginia4 aut |
| 700 | 1 | a Hornekaer, Livu Århus Universitet,Aarhus University4 aut |
| 700 | 1 | a Jäger, Corneliau Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)4 aut |
| 700 | 1 | a Janot-Pacheco, Eduardou Universidade de Sao Paulo (USP),University of Sao Paulo (USP)4 aut |
| 700 | 1 | a Kaufman, M.u San Jose State University4 aut |
| 700 | 1 | a Kemper, F.u Institut de Ciències de l'Espai (ICE) - CSIC,Institute of Space Sciences (ICE) - CSIC4 aut |
| 700 | 1 | a Kendrew, S.u European Space Agency (ESA)4 aut |
| 700 | 1 | a Kirsanova, M. S.u Russian Academy of Sciences4 aut |
| 700 | 1 | a Klaassen, Pamelau Royal Observatory4 aut |
| 700 | 1 | a Kwok, Sunu University of British Columbia (UBC)4 aut |
| 700 | 1 | a Labiano, A.u European Space Astronomy Centre (ESAC)4 aut |
| 700 | 1 | a Lai, Thomasu California Institute of Technology (Caltech)4 aut |
| 700 | 1 | a Lee, Timothy J.u NASA Ames Research Center4 aut |
| 700 | 1 | a Lefloch, B.4 aut |
| 700 | 1 | a Le Petit, Franck,d 1975u Observatoire de Paris,Paris Observatory4 aut |
| 700 | 1 | a Li, Aigenu University of Missouri4 aut |
| 700 | 1 | a Linz, H.u Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)4 aut |
| 700 | 1 | a MacKie, Cameron J.u Lawrence Berkeley National Laboratory4 aut |
| 700 | 1 | a Madden, S. C.u Université Paris-Saclay,University Paris-Saclay4 aut |
| 700 | 1 | a Mascetti, Joëlle4 aut |
| 700 | 1 | a McGuire, Brettu National Radio Astronomy Observatory4 aut |
| 700 | 1 | a Merino, Pablou CSIC - Instituto de Ciencia de Materiales de Madrid (ICMM)4 aut |
| 700 | 1 | a Micelotta, Elisabetta R.u Helsingin Yliopisto,University of Helsinki4 aut |
| 700 | 1 | a Misselt, K. A.u University of Arizona4 aut |
| 700 | 1 | a Morse, Jon A.4 aut |
| 700 | 1 | a Mulas, Giacomou Institut de Recherche en Astrophysique et Planétologie (IRAP)4 aut |
| 700 | 1 | a Neelamkodan, Naslim4 aut |
| 700 | 1 | a Ohsawa, Ryouu National Astronomical Observatory of Japan4 aut |
| 700 | 1 | a Omont, A.A.u Institut d 'Astrophysique de Paris4 aut |
| 700 | 1 | a Paladini, R.u California Institute of Technology (Caltech)4 aut |
| 700 | 1 | a Palumbo, Maria Elisabettau Istituto nazionale di astrofisica (INAF)4 aut |
| 700 | 1 | a Pathak, Amitu Banaras Hindu University4 aut |
| 700 | 1 | a Pendleton, Yvonne J.u University of Central Florida (UCF)4 aut |
| 700 | 1 | a Petrignani, Annemiekeu Universiteit Van Amsterdam,University of Amsterdam4 aut |
| 700 | 1 | a Pino, Thomasu Université Paris-Saclay,University Paris-Saclay4 aut |
| 700 | 1 | a Puga, E.u European Space Agency (ESA)4 aut |
| 700 | 1 | a Rangwala, Naseemu NASA Ames Research Center4 aut |
| 700 | 1 | a Rapacioli, Mathias4 aut |
| 700 | 1 | a Ricca, Alessandrau SETI Institute4 aut |
| 700 | 1 | a Roman-Duval, J.u Space Telescope Science Institute (STScI)4 aut |
| 700 | 1 | a Roser, Josephu SETI Institute4 aut |
| 700 | 1 | a Roueff, Evelyneu Observatoire de Paris,Paris Observatory4 aut |
| 700 | 1 | a Rouillé, Gaëlu Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)4 aut |
| 700 | 1 | a Salama, Faridu NASA Ames Research Center4 aut |
| 700 | 1 | a Sales, Dinalva A.4 aut |
| 700 | 1 | a Sandstrom, Karinu University of California at San Diego (UCSD)4 aut |
| 700 | 1 | a Sarre, Peteru University Of Nottingham4 aut |
| 700 | 1 | a Sciamma-O'Brien, Ellau NASA Ames Research Center4 aut |
| 700 | 1 | a Sellgren, Krisu Ohio State University4 aut |
| 700 | 1 | a Shenoy, Sachindev S.u Space Science Institute4 aut |
| 700 | 1 | a Teyssier, D.u European Space Astronomy Centre (ESAC)4 aut |
| 700 | 1 | a Thomas, Richard D.u Stockholms universitet,Stockholm University4 aut |
| 700 | 1 | a Togi, Adityau Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)4 aut |
| 700 | 1 | a Verstraete, Laurentu Institut d'Astrophysique Spatiale4 aut |
| 700 | 1 | a Witt, Adolf N.u Texas State University4 aut |
| 700 | 1 | a Wootten, A.u National Radio Astronomy Observatory4 aut |
| 700 | 1 | a Zettergren, H.u Stockholms universitet,Stockholm University4 aut |
| 700 | 1 | a Zhang, Yongu Sun Yat-Sen University4 aut |
| 700 | 1 | a Zhang, Ziwei E.u RIKEN4 aut |
| 700 | 1 | a Zhen, Junfeng4 aut |
| 710 | 2 | a Western Universityb Universiteit Leiden (UL)4 org |
| 773 | 0 | t Astronomy and Astrophysicsg 685q 685x 0004-6361x 1432-0746 |
| 856 | 4 | u https://research.chalmers.se/publication/541303/file/541303_Fulltext.pdfx primaryx freey FULLTEXT |
| 856 | 4 8 | u https://research.chalmers.se/publication/541303 |
| 856 | 4 8 | u https://doi.org/10.1051/0004-6361/202346662 |
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