PDRs4All III: JWST's NIR spectroscopic view of the Orion Bar
Creators: name: Peeters, Els
name: Habart, Emilie
name: Berne, Olivier
name: Sidhu, Ameek
name: Chown, Ryan
name: Van De Putte, Dries
name: Trahin, Boris
name: Schroetter, Ilane
name: Canin, Amelie
name: Alarcon, Felipe
name: Schefter, Bethany
name: Khan, Baria
name: Pasquini, Sofia
name: Tielens, Alexander G. G. M.
name: Wolfire, Mark G.
name: Dartois, Emmanuel
name: Goicoechea, Javier R.
name: Maragkoudakis, Alexandros
name: Onaka, Takashi
name: Pound, Marc W.
name: Vicente, Silvia
name: Abergel, Alain
name: Bergin, Edwin A.
name: Bernard-Salas, Jeronimo
name: Boersma, Christiaan
name: Bron, Emeric
name: Cami, Jan
name: Cuadrado, Sara
name: Dicken, Daniel
name: Elyajour, Meriem
name: Fuente, Asuncion
name: Gordon, Karl D.
name: Issa, Lina
name: Joblin, Christine
name: Kannavou, Olga
name: Lacinbala, Ozan
name: Languignon, David
name: Gal, Romane Le
name: Meshaka, Raphael
name: Okada, Yoko
name: Robberto, Massimo
name: Roellig, Markus
name: Schirmer, Thiebaut
name: Tabone, Benoit
name: Zannese, Marion
name: Aleman, Isabel
name: Allamandola, Louis
name: Auchettl, Rebecca
name: Baratta, Giuseppe Antonio
name: Bejaoui, Salma
name: Bera, Partha P.
name: Black, John H.
name: Boulanger, Francois
name: Bouwman, Jordy
name: Brandl, Bernhard
name: Brechignac, Philippe
name: Brunken, Sandra
name: Buragohain, Mridusmita
name: Burkhardt, Andrew
name: Candian, Alessandra
name: Cazaux, Stephanie
name: Cernicharo, Jose
name: Chabot, Marin
name: Chakraborty, Shubhadip
name: Champion, Jason
name: Colgan, Sean W. J.
name: Cooke, Ilsa R.
name: Coutens, Audrey
name: Cox, Nick L. J.
name: Demyk, Karine
name: Meyer, Jennifer Donovan
name: Foschino, Sacha
name: Garcia-Lario, Pedro
name: Gerin, Maryvonne
name: Gottlieb, Carl A.
name: Guillard, Pierre
name: Gusdorf, Antoine
name: Hartigan, Patrick
name: He, Jinhua
name: Herbst, Eric
name: Hornekaer, Liv
name: Jager, Cornelia
name: Janot-Pacheco, Eduardo
name: Kaufman, Michael
name: Kendrew, Sarah
name: Kirsanova, Maria S.
name: Klaassen, Pamela
name: Kwok, Sun
name: Labiano, Alvaro
name: Lai, Thomas S. -Y.
name: Lee, Timothy J.
name: Lefloch, Bertrand
name: Petit, Franck Le
name: Li, Aigen
name: Linz, Hendrik
name: Mackie, Cameron J.
name: Madden, Suzanne C.
name: Mascetti, Joelle
name: McGuire, Brett A.
name: Merino, Pablo
name: Micelotta, Elisabetta R.
name: Misselt, Karl
name: Morse, Jon A.
name: Mulas, Giacomo
name: Neelamkodan, Naslim
name: Ohsawa, Ryou
name: Paladini, Roberta
name: Palumbo, Maria Elisabetta
name: Pathak, Amit
name: Pendleton, Yvonne J.
name: Petrignani, Annemieke
name: Pino, Thomas
name: Puga, Elena
name: Rangwala, Naseem
name: Rapacioli, Mathias
name: Ricca, Alessandra
name: Roman-Duval, Julia
name: Roser, Joseph
name: Roueff, Evelyne
name: Rouille, Gael
name: Salama, Farid
name: Sales, Dinalva A.
name: Sandstrom, Karin
name: Sarre, Peter
name: Sciamma-O'Brien, Ella
name: Sellgren, Kris
name: Shenoy, Sachindev S.
name: Teyssier, David
name: Thomas, Richard D.
name: Togi, Aditya
name: Verstraete, Laurent
name: Witt, Adolf N.
name: Wootten, Alwyn
name: Ysard, Nathalie
name: Zettergren, Henning
name: Zhang, Yong
name: Zhang, Ziwei E.
name: Zhen, Junfeng
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: (Abridged) We investigate the impact of radiative feedback from massive stars on their natal cloud and focus on the transition from the HII region to the atomic PDR (crossing the ionisation front (IF)), and the subsequent transition to the molecular PDR (crossing the dissociation front (DF)). We use high-resolution near-IR integral field spectroscopic data from NIRSpec on JWST to observe the Orion Bar PDR as part of the PDRs4All JWST Early Release Science Program. The NIRSpec data reveal a forest of lines including, but not limited to, HeI, HI, and CI recombination lines, ionic lines, OI and NI fluorescence lines, Aromatic Infrared Bands (AIBs including aromatic CH, aliphatic CH, and their CD counterparts), CO2 ice, pure rotational and ro-vibrational lines from H2, and ro-vibrational lines HD, CO, and CH+, most of them detected for the first time towards a PDR. Their spatial distribution resolves the H and He ionisation structure in the Huygens region, gives insight into the geometry of the Bar, and confirms the large-scale stratification of PDRs. We observe numerous smaller scale structures whose typical size decreases with distance from Ori C and IR lines from CI, if solely arising from radiative recombination and cascade, reveal very high gas temperatures consistent with the hot irradiated surface of small-scale dense clumps deep inside the PDR. The H2 lines reveal multiple, prominent filaments which exhibit different characteristics. This leaves the impression of a "terraced" transition from the predominantly atomic surface region to the CO-rich molecular zone deeper in. This study showcases the discovery space created by JWST to further our understanding of the impact radiation from young stars has on their natal molecular cloud and proto-planetary disk, which touches on star- and planet formation as well as galaxy evolution.
description: 52 pages, 30 figures, submitted to A&amp;A