PDRs4All - IV. An embarrassment of riches: Aromatic infrared bands in the Orion Bar

Ryan Chown; Ameek Sidhu; Els Peeters; Alexander G.G.M Tielens; Jan Cami; Olivier Berné; Emilie Habart; Felipe Alarcón; Amélie Canin; Ilane Schroetter; Boris Trahin; Dries van de Putte; Alain Abergel; Edwin A Bergin; Jeronimo Bernard-Salas; Christiaan Boersma; Emeric Bron; Sara Cuadrado; Emmanuel Dartois; Daniel Dicken; Meriem El-Yajouri; Asunción Fuente; Javier R Goicoechea; Karl D Gordon; Lina Issa; Christine Joblin; Olga Kannavou; Baria Khan; Ozan Lacinbala; David Languignon; Romane Le Gal; Alexandros Maragkoudakis; Raphael Meshaka; Yoko Okada; Takashi Onaka; Sofia Pasquini; Marc W Pound; Massimo Robberto; Markus Röllig; Bethany Schefter; Thiébaut Schirmer; Sílvia Vicente; Mark G Wolfire; Marion Zannese; Isabel Aleman; Louis Allamandola; Rebecca Auchettl; Giuseppe Antonio Baratta; Salma Bejaoui; Partha P Bera; John H Black; François Boulanger; Jordy Bouwman; Bernhard Brandl; Philippe Brechignac; Sandra Brünken; Mridusmita Buragohain; Andrew Burkhardt; Alessandra Candian; Stéphanie Cazaux; Jose Cernicharo; Marin Chabot; Shubhadip Chakraborty; Jason Champion; Sean W.J Colgan; Ilsa R Cooke; Audrey Coutens; Nick L.J Cox; Karine Demyk; Jennifer Donovan Meyer; Sacha Foschino; Pedro García-Lario; Lisseth Gavilan; Maryvonne Gerin; Carl A Gottlieb; Pierre Guillard; Antoine Gusdorf; Patrick Hartigan; Jinhua He; Eric Herbst; Liv Hornekaer; Cornelia Jäger; Eduardo Janot-Pacheco; Michael Kaufman; Francisca Kemper; Sarah Kendrew; Maria S Kirsanova; Pamela Klaassen; Sun Kwok; Álvaro Labiano; Thomas S.-Y Lai; Timothy J Lee; Bertrand Lefloch; Franck Le Petit; Aigen Li; Hendrik Linz; Cameron J Mackie; Suzanne C Madden; Joëlle Mascetti; Brett A Mcguire; Pablo Merino; Elisabetta R Micelotta; Karl Misselt; Jon A Morse; Giacomo Mulas; Naslim Neelamkodan; Ryou Ohsawa; Alain Omont; Roberta Paladini; Maria Elisabetta Palumbo; Amit Pathak; Yvonne J Pendleton; Annemieke Petrignani; Thomas Pino; Elena Puga; Naseem Rangwala; Mathias Rapacioli; Alessandra Ricca; Julia Roman-Duval; Joseph Roser; Evelyne Roueff; Gaël Rouillé; Farid Salama; Dinalva A Sales; Karin Sandstrom; Peter Sarre; Ella Sciamma-O'Brien; Kris Sellgren; Sachindev S Shenoy; David Teyssier; Richard D Thomas; Aditya Togi; Laurent Verstraete; Adolf N Witt; Alwyn Wootten; Henning Zettergren; Yong Zhang; Ziwei E Zhang; Junfeng Zhen

doi:10.1051/0004-6361/202346662

Journal Articles Astronomy and Astrophysics - A&A Year : 2024

PDRs4All - IV. An embarrassment of riches: Aromatic infrared bands in the Orion Bar

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Ryan Chown

Function : Author

Ameek Sidhu

Function : Author

Els Peeters

Function : Author

Alexander G.G.M Tielens

Function : Author

Jan Cami

Function : Author

Olivier Berné

Function : Author

Institut de recherche en astrophysique et planétologie

Emilie Habart

Function : Author

Institut d'astrophysique spatiale

Felipe Alarcón

Function : Author

Amélie Canin

Function : Author

Institut de recherche en astrophysique et planétologie

Ilane Schroetter

Function : Author

Institut de recherche en astrophysique et planétologie

Boris Trahin

Function : Author

Institut d'astrophysique spatiale

Dries van de Putte

Function : Author

Alain Abergel

Function : Author

Institut d'astrophysique spatiale

Edwin A Bergin

Function : Author

Jeronimo Bernard-Salas

Function : Author

Département C.E.R.G.A

Christiaan Boersma

Function : Author

Emeric Bron

Function : Author

Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres

Sara Cuadrado

Function : Author

Emmanuel Dartois

Function : Author

Institut des Sciences Moléculaires d'Orsay

Daniel Dicken

Function : Author

Meriem El-Yajouri

Function : Author

Institut d'astrophysique spatiale

Asunción Fuente

Function : Author

Javier R Goicoechea

Function : Author

Karl D Gordon

Function : Author

Lina Issa

Function : Author

Institut de recherche en astrophysique et planétologie

Christine Joblin

Function : Author

Olga Kannavou

Function : Author

Institut d'astrophysique spatiale

Baria Khan

Function : Author

Ozan Lacinbala

Function : Author

David Languignon

Function : Author

Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres

Romane Le Gal

Function : Author

Institut de Planétologie et d'Astrophysique de Grenoble

Institut de RadioAstronomie Millimétrique

Alexandros Maragkoudakis

Function : Author

Raphael Meshaka

Function : Author

Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres

Institut d'astrophysique spatiale

Yoko Okada

Function : Author

Takashi Onaka

Function : Author

Sofia Pasquini

Function : Author

Marc W Pound

Function : Author

Massimo Robberto

Function : Author

Markus Röllig

Function : Author

Bethany Schefter

Function : Author

Thiébaut Schirmer

Function : Author

Institut d'astrophysique spatiale

Sílvia Vicente

Function : Author

Mark G Wolfire

Function : Author

Marion Zannese

Function : Author
PersonId : 1414951
IdHAL : marion-zannese
ORCID : 0009-0002-6069-0907

Institut d'astrophysique spatiale

Isabel Aleman

Function : Author

Louis Allamandola

Function : Author

Rebecca Auchettl

Function : Author

Giuseppe Antonio Baratta

Function : Author

Salma Bejaoui

Function : Author

Partha P Bera

Function : Author

John H Black

Function : Author

François Boulanger

Function : Author

Astrophysique

Jordy Bouwman

Function : Author

Bernhard Brandl

Function : Author

Philippe Brechignac

Function : Author

Institut des Sciences Moléculaires d'Orsay

Sandra Brünken

Function : Author

Mridusmita Buragohain

Function : Author

Andrew Burkhardt

Function : Author

Alessandra Candian

Function : Author

Stéphanie Cazaux

Function : Author

Jose Cernicharo

Function : Author

Marin Chabot

Function : Author

Laboratoire de Physique des 2 Infinis Irène Joliot-Curie

Shubhadip Chakraborty

Function : Author

Institut de Physique de Rennes

Jason Champion

Function : Author

Institut de recherche en astrophysique et planétologie

Sean W.J Colgan

Function : Author

Ilsa R Cooke

Function : Author

Audrey Coutens

Function : Author
PersonId : 739468
IdHAL : audrey-coutens
ORCID : 0000-0003-1805-3920
IdRef : 167181491

Institut de recherche en astrophysique et planétologie

Nick L.J Cox

Function : Author

Département C.E.R.G.A

Karine Demyk

Function : Author

Institut de recherche en astrophysique et planétologie

Jennifer Donovan Meyer

Function : Author

Sacha Foschino

Function : Author

Institut de recherche en astrophysique et planétologie

Pedro García-Lario

Function : Author

Lisseth Gavilan

Function : Author

Maryvonne Gerin

Function : Author

Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres

Carl A Gottlieb

Function : Author

Pierre Guillard

Function : Author

Institut d'Astrophysique de Paris

Institut universitaire de France

Antoine Gusdorf

Function : Author

Laboratoire de physique de l'ENS - ENS Paris

Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres

Patrick Hartigan

Function : Author

Jinhua He

Function : Author

Eric Herbst

Function : Author

Liv Hornekaer

Function : Author

Cornelia Jäger

Function : Author

Eduardo Janot-Pacheco

Function : Author

Michael Kaufman

Function : Author

Francisca Kemper

Function : Author

Sarah Kendrew

Function : Author

Maria S Kirsanova

Function : Author

Pamela Klaassen

Function : Author

Sun Kwok

Function : Author

Álvaro Labiano

Function : Author

Thomas S.-Y Lai

Function : Author

Timothy J Lee

Function : Author

Bertrand Lefloch

Function : Author

Institut de Planétologie et d'Astrophysique de Grenoble

Franck Le Petit

Function : Author

Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres

Aigen Li

Function : Author

Hendrik Linz

Function : Author

Cameron J Mackie

Function : Author

Suzanne C Madden

Function : Author

Astrophysique Interprétation Modélisation

Joëlle Mascetti

Function : Author

Institut de Mathématiques de Bordeaux

Brett A Mcguire

Function : Author

Pablo Merino

Function : Author

Elisabetta R Micelotta

Function : Author

Karl Misselt

Function : Author

Jon A Morse

Function : Author

Giacomo Mulas

Function : Author

Institut de recherche en astrophysique et planétologie

Naslim Neelamkodan

Function : Author

Ryou Ohsawa

Function : Author

Alain Omont

Function : Author

Institut d'Astrophysique de Paris

Roberta Paladini

Function : Author

Maria Elisabetta Palumbo

Function : Author

Amit Pathak

Function : Author

Yvonne J Pendleton

Function : Author

Annemieke Petrignani

Function : Author

Thomas Pino

Function : Author

Institut des Sciences Moléculaires d'Orsay

Elena Puga

Function : Author

Naseem Rangwala

Function : Author

Mathias Rapacioli

Function : Author
PersonId : 171955
IdHAL : mathias-rapacioli
ORCID : 0000-0003-2394-6694
IdRef : 103543368

Laboratoire de Chimie et Physique Quantiques

Modélisation, Agrégats, Dynamique (LCPQ)

Alessandra Ricca

Function : Author

Julia Roman-Duval

Function : Author

Joseph Roser

Function : Author

Evelyne Roueff

Function : Author

Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres

Gaël Rouillé

Function : Author

Farid Salama

Function : Author

Dinalva A Sales

Function : Author

Karin Sandstrom

Function : Author

Peter Sarre

Function : Author

Ella Sciamma-O'Brien

Function : Author

Kris Sellgren

Function : Author

Sachindev S Shenoy

Function : Author

David Teyssier

Function : Author

Richard D Thomas

Function : Author

Aditya Togi

Function : Author

Laurent Verstraete

Function : Author

Institut d'astrophysique spatiale

Adolf N Witt

Function : Author

Alwyn Wootten

Function : Author

Henning Zettergren

Function : Author

Yong Zhang

Function : Author

Ziwei E Zhang

Function : Author

Junfeng Zhen

Function : Author

Abstract

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’.Key words: astrochemistry / infrared: ISM / ISM: molecules / ISM: individual objects: Orion Bar / photon-dominated region (PDR) / techniques: spectroscopic★ The 5 template spectra are available at the CDS via anonymous ftp to cdsarc.cds.unistra.fr (130.79.128.5) or via https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/685/A75★★ Tim Lee sadly passed away on Nov. 3, 2022.

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Astrophysics [astro-ph]

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Submitted on : Tuesday, June 18, 2024-1:50:05 PM

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hal-04615526 , version 1 (18-06-2024)

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HAL Id : hal-04615526 , version 1
ARXIV : 2308.16733
DOI : 10.1051/0004-6361/202346662
INSPIRE : 2798282

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Ryan Chown, Ameek Sidhu, Els Peeters, Alexander G.G.M Tielens, Jan Cami, et al.. PDRs4All - IV. An embarrassment of riches: Aromatic infrared bands in the Orion Bar. Astronomy and Astrophysics - A&A, 2024, 685, pp.A75. ⟨10.1051/0004-6361/202346662⟩. ⟨hal-04615526⟩

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PDRs4All - IV. An embarrassment of riches: Aromatic infrared bands in the Orion Bar

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