| Title: |
PDRs4All : IV. An embarrassment of riches: Aromatic infrared bands in the Orion Bar |
| Authors: |
Chown, Ryan; Sidhu, Ameek; Peeters, Els; Tielens, Alexander G.G.M.; Cami, Jan; Berné, Olivier; Habart, Emilie; Alarcón, Felipe; Canin, Amélie; Schroetter, Ilane; Trahin, Boris; Van De Putte, Dries; Abergel, Alain; Bergin, Edwin A.; Bernard-Salas, Jeronimo; Boersma, Christiaan; Bron, Emeric; Cuadrado, Sara; Dartois, Emmanuel; Dicken, Daniel; El-Yajouri, Meriem; Fuente, Asunción; Goicoechea, Javier R.; Gordon, Karl D.; Issa, Lina; Joblin, Christine; Kannavou, Olga; Khan, Baria; Lacinbala, Ozan; Languignon, David; Le Gal, Romane; Maragkoudakis, Alexandros; Meshaka, Raphael; Okada, Yoko; Onaka, Takashi; Pasquini, Sofia; Pound, Marc W.; Robberto, Massimo; Röllig, Markus; Schefter, Bethany; Schirmer, Thiébaut; Vicente, Sílvia; Wolfire, Mark G.; Zannese, Marion; Aleman, Isabel; Allamandola, Louis; Auchettl, Rebecca; Baratta, Giuseppe Antonio; Bejaoui, Salma; Bera, Partha P.; Black, John H.; Boulanger, François; Bouwman, Jordy; Brandl, Bernhard; Brechignac, Philippe; Brünken, Sandra; Buragohain, Mridusmita; Burkhardt, Andrew; Candian, Alessandra; Cazaux, Stéphanie; Cernicharo, Jose; Chabot, Marin; Chakraborty, Shubhadip; Champion, Jason; Colgan, Sean W.J.; Cooke, Ilsa R.; Coutens, Audrey; Cox, Nick L.J.; Demyk, Karine; Meyer, Jennifer Donovan; Foschino, Sacha; García-Lario, Pedro; Gavilan, Lisseth; Gerin, Maryvonne; Gottlieb, Carl A.; Guillard, Pierre; Gusdorf, Antoine; Hartigan, Patrick; He, Jinhua; Herbst, Eric; Hornekaer, Liv; Jäger, Cornelia; Janot-Pacheco, Eduardo; Kaufman, Michael; Kemper, Francisca; Kendrew, Sarah; Kirsanova, Maria S.; Klaassen, Pamela; Kwok, Sun; Labiano, Álvaro; Lai, Thomas S.Y.; Lee, Timothy J.; Lefloch, Bertrand; Le Petit, Franck; Li, Aigen; Linz, Hendrik; Mackie, Cameron J.; Madden, Suzanne C.; Mascetti, Joëlle; McGuire, Brett A.; Merino, Pablo; Micelotta, Elisabetta R.; Misselt, Karl; Morse, Jon A.; Mulas, Giacomo; Neelamkodan, Naslim; Ohsawa, Ryou; Omont, Alain; Paladini, Roberta; Palumbo, Maria Elisabetta; Pathak, Amit; Pendleton, Yvonne J.; Petrignani, Annemieke; Pino, Thomas; Puga, Elena; Rangwala, Naseem; Rapacioli, Mathias; Ricca, Alessandra; Roman-Duval, Julia; Roser, Joseph; Roueff, Evelyne; Rouillé, Gaël; Salama, Farid; Sales, Dinalva A.; Sandstrom, Karin; Sarre, Peter; Sciamma-O’Brien, Ella; Sellgren, Kris; Shenoy, Sachindev S.; Teyssier, David; Thomas, Richard D.; Togi, Aditya; Verstraete, Laurent; Witt, Adolf N.; Wootten, Alwyn; Zettergren, Henning; Zhang, Yong; Zhang, Ziwei E.; Zhen, Junfeng |
| Contributors: |
Department of Physics |
| Publisher Information: |
EDP sciences |
| Publication Year: |
2025 |
| Collection: |
Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
| Subject Terms: |
Astrochemistry; Infrared: ISM; ISM: individual objects: Orion Bar; ISM: molecules; Photon-dominated region (PDR); Techniques: spectroscopic; Astronomy; Space science |
| Description: |
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 ... |
| Document Type: |
article in journal/newspaper |
| File Description: |
application/pdf |
| Language: |
English |
| Relation: |
We thank the referee, Alan Tokunaga, for constructive comments on the manuscript. We are very grateful to the JWST Help Desk for their support with pipeline and calibration issues that were encountered while writing this paper. This work is based on observations made with the NASA/ESA/CSA James Webb Space Telescope. The data were obtained from the Mikulski Archive for Space Telescopes at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-03127 for JWST. These observations are associated with program #1288. Support for program #1288 was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-03127. E.P. and J.C. acknowledge support from the University of Western Ontario, the Institute for Earth and Space Exploration, the Canadian Space Agency (CSA; 22JWGO1- 16), and the Natural Sciences and Engineering Research Council of Canada. Studies of interstellar PAHs at Leiden Observatory (AT) are supported by a Spinoza premie from the Dutch Science Agency, NWO. C.B. is grateful for an appointment at NASA Ames Research Center through the San Jos\u00E9 State University Research Foundation (80NSSC22M0107). Part of this work was supported by the Programme National \u201CPhysique et Chimie du Milieu Interstellaire\u201D (PCMI) of CNRS/INSU with INC/INP co-funded by CEA and CNES. J.R.G. and S.C. thank the Spanish MCINN for funding support under grant PID2019-106110GB-I00. T.O. is supported by JSPS Bilateral Program, Grant Number 120219939. Work by Y.O. and M.R. is carried out within the Collaborative Research Centre 956, sub-project C1, funded by the Deutsche Forschungsgemeinschaft (DFG) \u2013 project ID 184018867. This work was also partly supported by the Spanish program Unidad de Excelencia Mar\u00EDa de Maeztu CEX2020-001058-M, financed by MCIN/AEI/10.13039/501100011033. N.N. is funded by the United Arab Emirates University (UAEU) through UAEU Program for Advanced Research (UPAR) grant G00003479. A.P. (Amit Pathak) would like to acknowledge financial support from Department of Science and Technology \u2013 SERB via Core Research Grant (DST-CRG) grant (SERB-CRG/2021/000907), Institutes of Eminence (IoE) incentive grant, BHU (incentive/2021-22/32439), Banaras Hindu University, Varanasi and thanks the Inter-University Centre for Astronomy and Astrophysics, Pune for associateship. This work is sponsored (in part) by the CAS, through a grant to the CAS South America Center for Astronomy (CASSACA) in Santiago, Chile. A.R. gratefully acknowledges support from the directed Work Package at NASA Ames titled: \u2018Laboratory Astrophysics \u2013 The NASA Ames PAH IR Spectroscopic Database\u2019. M.B. acknowledges DST for the DST INSPIRE Faculty fellowship. H.Z. acknowledges support from the Swedish Research Council (contract no. 2020-03437). P.M. acknowledges grants EUR2021-122006, TED2021-129416A-I00 and PID2021-125309OA-I00 funded by MCIN/AEI/ 10.13039/501100011033 and European Union NextGenerationEU/PRTR. M.S.K. is funded by RSCF, grant number 21-12-00373. We thank the referee, Alan Tokunaga, for constructive comments on the manuscript. We are very grateful to the JWST Help Desk for their support with pipeline and calibration issues that were encountered while writing this paper. This work is based on observations made with the NASA/ESA/CSA James Webb Space Telescope. The data were obtained from the Mikulski Archive for Space Telescopes at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-03127 for JWST. These observations are associated with program #1288. Support for program #1288 was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-03127. E.P. and J.C. acknowledge support from the University of Western Ontario, the Institute for Earth and Space Exploration, the Canadian Space Agency (CSA; 22JWGO1- 16), and the Natural Sciences and Engineering Research Council of Canada. Studies of interstellar PAHs at Leiden Observatory (AT) are supported by a Spinoza premie from the Dutch Science Agency, NWO. C.B. is grateful for an appointment at NASA Ames Research Center through the San Jos\u00E9 State University Research Foundation (80NSSC22M0107). Part of this work was supported by the Programme National \"Physique et Chimie du Milieu Interstellaire\" (PCMI) of CNRS/INSU with INC/INP co-funded by CEA and CNES. J.R.G. and S.C. thank the Spanish MCINN for funding support under grant PID2019-106110GB-I00. T.O. is supported by JSPS Bilateral Program, Grant Number 120219939. Work by Y.O. and M.R. is carried out within the Collaborative Research Centre 956, sub-project C1, funded by the Deutsche Forschungsgemeinschaft (DFG) \u2013 project ID 184018867. This work was also partly supported by the Spanish program Unidad de Excelencia Mar\u00EDa de Maeztu CEX2020-001058-M, financed by MCIN/AEI/10.13039/501100011033. N.N. is funded by the United Arab Emirates University (UAEU) through UAEU Program for Advanced Research (UPAR) grant G00003479. A.P. (Amit Pathak) would like to acknowledge financial support from Department of Science and Technology - SERB via Core Research Grant (DST-CRG) grant (SERB-CRG/2021/000907), Institutes of Eminence (IoE) incentive grant, BHU (incentive/2021-22/32439), Banaras Hindu University, Varanasi and thanks the Inter-University Centre for Astronomy and Astrophysics, Pune for associateship. This work is sponsored (in part) by the CAS, through a grant to the CAS South America Center for Astronomy (CASSACA) in Santiago, Chile. A.R. gratefully acknowledges support from the directed Work Package at NASA Ames titled: 'Laboratory Astrophysics -The NASA Ames PAH IR Spectroscopic Database'. M.B. acknowledges DST for the DST INSPIRE Faculty fellowship. H.Z. acknowledges support from the Swedish Research Council (contract no. 2020-03437). P.M. acknowledges grants EUR2021-122006, TED2021-129416A-I00 and PID2021-125309OA-I00 funded by MCIN/AEI/ 10.13039/501100011033 and European Union NextGener-ationEU/PRTR. M.S.K. is funded by RSCF, grant number 21-12-00373.; https://hdl.handle.net/10138/590636; 85193435782; 001271220100003 |
| Availability: |
https://hdl.handle.net/10138/590636 |
| Rights: |
cc_by ; info:eu-repo/semantics/openAccess ; openAccess |
| Accession Number: |
edsbas.F1F6D42B |
| Database: |
BASE |