PDRs4All IV. An embarrassment of riches: Aromatic infrared bands in the Orion Bar
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arXiv
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| Format: | Preprint |
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2023
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| author | 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 Gal, Romane Le 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, Francois 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 Petit, Franck Le 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 |
| author_facet | 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 Gal, Romane Le 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, Francois 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 Petit, Franck Le 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 |
| contents | (Abridged) 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 $μ$m. The most sensitive, highest-resolution infrared spectral imaging data ever taken of the prototypical PDR, the Orion Bar, have been captured by JWST. 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, the atomic PDR, and the HII region. We use JWST NIRSpec IFU and MIRI MRS observations of the Orion Bar from the JWST Early Release Science Program, PDRs4All (ID: 1288). We extract five template spectra to represent the morphology and environment of the Orion Bar PDR. 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. While the spectra are dominated by the well-known AIBs at 3.3, 6.2, 7.7, 8.6, 11.2, and 12.7 $μ$m, a wealth of weaker features and sub-components are present. We report trends in the widths and relative strengths of AIBs across the five template spectra. These trends yield valuable insight into the photochemical evolution of PAHs, such as the evolution responsible for the shift of 11.2 $μ$m AIB emission from class B$_{11.2}$ in the molecular PDR to class A$_{11.2}$ 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'. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_16733 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | PDRs4All IV. An embarrassment of riches: Aromatic infrared bands in the Orion Bar 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 Gal, Romane Le 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, Francois 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 Petit, Franck Le 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 Astrophysics of Galaxies Solar and Stellar Astrophysics (Abridged) 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 $μ$m. The most sensitive, highest-resolution infrared spectral imaging data ever taken of the prototypical PDR, the Orion Bar, have been captured by JWST. 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, the atomic PDR, and the HII region. We use JWST NIRSpec IFU and MIRI MRS observations of the Orion Bar from the JWST Early Release Science Program, PDRs4All (ID: 1288). We extract five template spectra to represent the morphology and environment of the Orion Bar PDR. 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. While the spectra are dominated by the well-known AIBs at 3.3, 6.2, 7.7, 8.6, 11.2, and 12.7 $μ$m, a wealth of weaker features and sub-components are present. We report trends in the widths and relative strengths of AIBs across the five template spectra. These trends yield valuable insight into the photochemical evolution of PAHs, such as the evolution responsible for the shift of 11.2 $μ$m AIB emission from class B$_{11.2}$ in the molecular PDR to class A$_{11.2}$ 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'. |
| title | PDRs4All IV. An embarrassment of riches: Aromatic infrared bands in the Orion Bar |
| topic | Astrophysics of Galaxies Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2308.16733 |