PDRs4All III：JWST对猎户座条形结构的近红外光谱观测
星系天体物理
2024-05-15 v1
摘要
（删节版）我们研究大质量恒星的辐射反馈对其母云的影响，聚焦于从HII区到原子PDR的过渡（跨越电离前沿（IF）），以及随后到分子PDR的过渡（跨越解离前沿（DF））。作为PDRs4All JWST早期释放科学计划的一部分，我们使用JWST上NIRSpec的高分辨率近红外积分场光谱数据观测猎户座条形PDR。NIRSpec数据揭示了一片谱线森林，包括但不限于HeI、HI和CI复合线、离子线、OI和NI荧光线、芳香红外带（AIBs，含芳香CH、脂肪族CH及其CD对应物）、CO2冰、H2的纯转动与转振线，以及HD、CO和CH+的转振线，其中大多数系首次在PDR中探测到。它们的空间分布解析了Huygens区域的H与He电离结构，增进了对条形结构几何的认识，并证实了PDR的大尺度分层。我们观测到众多更小尺度结构，其典型尺寸随距Ori C距离增加而减小；若CI的红外谱线仅源自辐射复合与级联，则揭示出极高气体温度，与PDR深处小尺度致密团块受热辐照表面一致。H2谱线揭示多条呈现不同特征的显著细丝，给人以从以原子为主的表面区到更深处富CO分子区呈“阶梯状”过渡的印象。本研究展示了JWST所开创的发现空间，以深化我们对年轻恒星辐射影响其母分子云与原行星盘的理解，这涉及恒星与行星形成以及星系演化。
引用
@article{arxiv.2310.08720,
title = {PDRs4All III: JWST's NIR spectroscopic view of the Orion Bar},
author = {Els Peeters and Emilie Habart and Olivier Berne and Ameek Sidhu and Ryan Chown and Dries Van De Putte and Boris Trahin and Ilane Schroetter and Amelie Canin and Felipe Alarcon and Bethany Schefter and Baria Khan and Sofia Pasquini and Alexander G. G. M. Tielens and Mark G. Wolfire and Emmanuel Dartois and Javier R. Goicoechea and Alexandros Maragkoudakis and Takashi Onaka and Marc W. Pound and Silvia Vicente and Alain Abergel and Edwin A. Bergin and Jeronimo Bernard-Salas and Christiaan Boersma and Emeric Bron and Jan Cami and Sara Cuadrado and Daniel Dicken and Meriem Elyajour and Asuncion Fuente and Karl D. Gordon and Lina Issa and Christine Joblin and Olga Kannavou and Ozan Lacinbala and David Languignon and Romane Le Gal and Raphael Meshaka and Yoko Okada and Massimo Robberto and Markus Roellig and Thiebaut Schirmer and Benoit Tabone and Marion Zannese and Isabel Aleman and Louis Allamandola and Rebecca Auchettl and Giuseppe Antonio Baratta and Salma Bejaoui and Partha P. Bera and John H. Black and Francois Boulanger and Jordy Bouwman and Bernhard Brandl and Philippe Brechignac and Sandra Brunken and Mridusmita Buragohain and Andrew Burkhardt and Alessandra Candian and Stephanie Cazaux and Jose Cernicharo and Marin Chabot and Shubhadip Chakraborty and Jason Champion and Sean W. J. Colgan and Ilsa R. Cooke and Audrey Coutens and Nick L. J. Cox and Karine Demyk and Jennifer Donovan Meyer and Sacha Foschino and Pedro Garcia-Lario and Maryvonne Gerin and Carl A. Gottlieb and Pierre Guillard and Antoine Gusdorf and Patrick Hartigan and Jinhua He and Eric Herbst and Liv Hornekaer and Cornelia Jager and Eduardo Janot-Pacheco and Michael Kaufman and Sarah Kendrew and Maria S. Kirsanova and Pamela Klaassen and Sun Kwok and Alvaro Labiano and Thomas S. -Y. Lai and Timothy J. Lee and Bertrand Lefloch and Franck Le Petit and Aigen Li and Hendrik Linz and Cameron J. Mackie and Suzanne C. Madden and Joelle Mascetti and Brett A. McGuire and Pablo Merino and Elisabetta R. Micelotta and Karl Misselt and Jon A. Morse and Giacomo Mulas and Naslim Neelamkodan and Ryou Ohsawa and Roberta Paladini and Maria Elisabetta Palumbo and Amit Pathak and Yvonne J. Pendleton and Annemieke Petrignani and Thomas Pino and Elena Puga and Naseem Rangwala and Mathias Rapacioli and Alessandra Ricca and Julia Roman-Duval and Joseph Roser and Evelyne Roueff and Gael Rouille and Farid Salama and Dinalva A. Sales and Karin Sandstrom and Peter Sarre and Ella Sciamma-O'Brien and Kris Sellgren and Sachindev S. Shenoy and David Teyssier and Richard D. Thomas and Aditya Togi and Laurent Verstraete and Adolf N. Witt and Alwyn Wootten and Nathalie Ysard and Henning Zettergren and Yong Zhang and Ziwei E. Zhang and Junfeng Zhen},
journal= {arXiv preprint arXiv:2310.08720},
year = {2024}
}
备注
52 pages, 30 figures, submitted to A&A