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arXiv 2310.08720astro-ph.GA
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PDRs4All III:JWST对猎户座棒状结构的近红外光谱观测

PDRs4All III: JWST's NIR spectroscopic view of the Orion Bar

Els Peeters, Emilie Habart, Olivier Berne, Ameek Sidhu, Ryan Chown, Dries Van De Putte, Boris Trahin, Ilane Schroetter, Amelie Canin, Felipe Alarcon, Bethany Sc… 展开作者

Els Peeters, Emilie Habart, Olivier Berne, Ameek Sidhu, Ryan Chown, Dries Van De Putte, Boris Trahin, Ilane Schroetter, Amelie Canin, Felipe Alarcon, Bethany Schefter, Baria Khan, Sofia Pasquini, Alexander G. G. M. Tielens, Mark G. Wolfire, Emmanuel Dartois, Javier R. Goicoechea, Alexandros Maragkoudakis, Takashi Onaka, Marc W. Pound, Silvia Vicente, Alain Abergel, Edwin A. Bergin, Jeronimo Bernard-Salas, Christiaan Boersma, Emeric Bron, Jan Cami, Sara Cuadrado, Daniel Dicken, Meriem Elyajour, Asuncion Fuente, Karl D. Gordon, Lina Issa, Christine Joblin, Olga Kannavou, Ozan Lacinbala, David Languignon, Romane Le Gal, Raphael Meshaka, Yoko Okada, Massimo Robberto, Markus Roellig, Thiebaut Schirmer, Benoit Tabone, Marion Zannese, Isabel Aleman, Louis Allamandola, Rebecca Auchettl, Giuseppe Antonio Baratta, Salma Bejaoui, Partha P. Bera, John H. Black, Francois Boulanger, Jordy Bouwman, Bernhard Brandl, Philippe Brechignac, Sandra Brunken, Mridusmita Buragohain, Andrew Burkhardt, Alessandra Candian, Stephanie 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 Garcia-Lario, Maryvonne Gerin, Carl A. Gottlieb, Pierre Guillard, Antoine Gusdorf, Patrick Hartigan, Jinhua He, Eric Herbst, Liv Hornekaer, Cornelia Jager, Eduardo Janot-Pacheco, Michael Kaufman, Sarah Kendrew, Maria S. Kirsanova, Pamela Klaassen, Sun Kwok, Alvaro Labiano, Thomas S. -Y. Lai, Timothy J. Lee, Bertrand Lefloch, Franck Le Petit, Aigen Li, Hendrik Linz, Cameron J. Mackie, Suzanne C. Madden, Joelle Mascetti, Brett A. McGuire, Pablo Merino, Elisabetta R. Micelotta, Karl Misselt, Jon A. Morse, Giacomo Mulas, Naslim Neelamkodan, Ryou Ohsawa, 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, Gael Rouille, 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, Nathalie Ysard, Henning Zettergren, Yong Zhang, Ziwei E. Zhang, Junfeng Zhen

AI总结:

本研究利用JWST/NIRSpec高分辨率近红外光谱观测猎户座棒状结构PDR,首次探测到多种谱线,解析了电离结构与分层特征,揭示小尺度结构与阶梯式过渡,推进对恒星辐射反馈及相关天体演化的理解。

摘要:

(摘要有删节)我们研究大质量恒星的辐射反馈对其诞生星云的影响,重点关注从电离氢区(HII区)到原子光致解离区(PDR)的过渡(穿越电离前(IF)),以及随后到分子光致解离区(PDR)的过渡(穿越解离前(DF))。作为PDRs4All詹姆斯·韦伯空间望远镜(JWST)早期发布科学计划的一部分,我们使用JWST上近红外光谱仪(NIRSpec)的高分辨率近红外积分场光谱数据观测猎户座棒状结构PDR。NIRSpec数据揭示了密集的谱线群,包括但不限于HeI、HI和CI复合线、离子线、OI和NI荧光线、芳香族红外波段(AIBs,包括芳香族CH、脂肪族CH及其对应的CD同位素谱线)、CO2冰、H2的纯转动和振转谱线,以及HD、CO和CH+的振转谱线,其中大多数是首次在PDR方向探测到。它们的空间分布解析了惠更斯区域的氢和氦电离结构,揭示了棒状结构的几何形态,并证实了PDR的大尺度分层结构。我们观测到大量小尺度结构,其典型尺寸随与Ori C的距离增加而减小;若CI的红外谱线仅由辐射复合和级联过程产生,则其揭示了极高的气体温度,这与PDR内部深处小尺度致密团块的受辐照热表面相符。H2谱线揭示了多条具有不同特征的显著纤维结构,给人一种从以原子为主的表面区域到深处富CO分子区的“阶梯式”过渡的印象。这项研究展示了JWST开辟的发现空间,有助于我们进一步理解年轻恒星的辐射对其诞生分子云和原行星盘的影响,这一问题与恒星和行星形成以及星系演化相关。

英文摘要:

(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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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