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

文献类型：期刊论文

作者Peeters, Els97,98,99; Habart, Emilie96; Berné, Olivier95; Sidhu, Ameek98,99; Chown, Ryan98,99; Putte, Dries Van De94; Trahin, Boris96; Schroetter, Ilane95; Canin, Amélie95; Alarcón, Felipe93
刊名ASTRONOMY & ASTROPHYSICS
出版日期2024-05-14
卷号685
关键词techniques: spectroscopic HII regions photon-dominated region (PDR) infrared: ISM ISM individual objects: Orion Bar
ISSN号0004-6361
DOI10.1051/0004-6361/202348244
产权排序第57完成单位
文献子类Article
英文摘要Context. JWST has taken the sharpest and most sensitive infrared (IR) spectral imaging observations ever of the Orion Bar photodissociation region (PDR), which is part of the nearest massive star-forming region the Orion Nebula, and often considered to be the 'prototypical' strongly illuminated PDR. Aims. We investigate the impact of radiative feedback from massive stars on their natal cloud and focus on the transition from the H II region to the atomic PDR - crossing the ionisation front (IF) -, and the subsequent transition to the molecular PDR - crossing the dissociation front (DF). Given the prevalence of PDRs in the interstellar medium and their dominant contribution to IR radiation, understanding the response of the PDR gas to far-ultraviolet (FUV) photons and the associated physical and chemical processes is fundamental to our understanding of star and planet formation and for the interpretation of any unresolved PDR as seen by JWST. Methods. We used 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 programme. We constructed a 3'' x 25'' spatio-spectral mosaic covering 0.975.27 mu m at a spectral resolution R of similar to 2700 and an angular resolution of 0.075''-0.173''. To study the properties of key regions captured in this mosaic, we extracted five template spectra in apertures centred on the three H-2 dissociation fronts, the atomic PDR, and the H II region. This wealth of detailed spatial-spectral information was analysed in terms of variations in the physical conditions-incident UV field, density, and temperature - of the PDR gas. Results. The NIRSpec data reveal a forest of lines including, but not limited to, He I, H I, and C I recombination lines; ionic lines (e.g. Fe III and Fe II); O I and N I fluorescence lines; aromatic infrared bands (AIBs, including aromatic CH, aliphatic CH, and their CD counterparts); pure rotational and ro-vibrational lines from H2; and ro-vibrational lines from HD, CO, and CH+, with most of them having been 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. In addition, we observed numerous smaller-scale structures whose typical size decreases with distance from theta(1) Ori C and IR lines from C I, if solely arising from radiative recombination and cascade, reveal very high gas temperatures (a few 1000 K) consistent with the hot irradiated surface of small-scale dense clumps inside the PDR. The morphology of the Bar, in particular that of the H-2 lines, reveals multiple prominent filaments that 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. We attribute the different characteristics of the H2 filaments to their varying depth into the PDR and, in some cases, not reaching the C+/C/CO transition. These observations thus reveal what local conditions are required to drive the physical and chemical processes needed to explain the different characteristics of the DFs and the photochemical evolution of the AIB carriers. Conclusions. 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.
学科主题天文学
URL标识查看原文
出版地17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE
WOS关键词POLYCYCLIC AROMATIC-HYDROCARBONS ; TRIGGERED STAR-FORMATION ; NONEQUILIBRIUM PHOTODISSOCIATION REGIONS ; IR ABSORPTION-SPECTROSCOPY ; NEAR-INFRARED SPECTROSCOPY ; RADIO RECOMBINATION LINES ; VIBRATIONALLY EXCITED H-2 ; FAINT EMISSION-LINES ; D BAND STRENGTHS ; MOLECULAR-HYDROGEN
资助项目Association of Universities for Research in Astronomy, Inc., under NASA[NAS 5-03127]; NASA Space Telescope Science Institute[1288]; University of Western Ontario; Institute for Earth and Space Exploration; Canadian Space Agency (CSA)[22JWGO1-16]; Natural Sciences and Engineering Research Council of Canada; Spanish MCINN[PID2019-106110GB-I00]; NASA Ames Research Center through the San Jose State University Research Foundation[80NSSC22M0107]; JSPS Bilateral Program[120219939]; JWST Theory[JWST-AR-01557.001-A]; Programme National Physique et Chimie du Milieu Interstellaire (PCMI) of CNRS/INSU with INC/INP; CEA; CNES; Deutsche Forschungsgemeinschaft (DFG)[184018867]; Program of Academic Research Projects Management, PRPI-USP; DST, India; Chinese Academy of Sciences (CAS); Russian Science Foundation[21-12-00373]; MCIN/AEI[EUR2021-122006]; MCIN/AEI[TED2021-129416A-I00]; MCIN/AEI[PID2021-125309OA-I00]; European Union NextGenerationEU/PRTR; United Arab Emirates University (UAEU) through UAEU Program for Advanced Research (UPAR)[G00003479]; Banaras Hindu University's IoE grant[R/Dev/D/IoE/Incentive/2021-22/32439]; SERB, New Delhi[CRG/2021/000907]; IUCAA, Pune; Swedish Research Council[2020-03437]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001271220100002
出版者EDP SCIENCES S A
资助机构Association of Universities for Research in Astronomy, Inc., under NASA[NAS 5-03127] ; NASA Space Telescope Science Institute[1288] ; University of Western Ontario ; Institute for Earth and Space Exploration ; Canadian Space Agency (CSA)[22JWGO1-16] ; Natural Sciences and Engineering Research Council of Canada ; Spanish MCINN[PID2019-106110GB-I00] ; NASA Ames Research Center through the San Jose State University Research Foundation[80NSSC22M0107] ; JSPS Bilateral Program[120219939] ; JWST Theory[JWST-AR-01557.001-A] ; Programme National Physique et Chimie du Milieu Interstellaire (PCMI) of CNRS/INSU with INC/INP ; CEA ; CNES ; Deutsche Forschungsgemeinschaft (DFG)[184018867] ; Program of Academic Research Projects Management, PRPI-USP ; DST, India ; Chinese Academy of Sciences (CAS) ; Russian Science Foundation[21-12-00373] ; MCIN/AEI[EUR2021-122006, TED2021-129416A-I00, PID2021-125309OA-I00] ; European Union NextGenerationEU/PRTR ; United Arab Emirates University (UAEU) through UAEU Program for Advanced Research (UPAR)[G00003479] ; Banaras Hindu University's IoE grant[R/Dev/D/IoE/Incentive/2021-22/32439] ; SERB, New Delhi[CRG/2021/000907] ; IUCAA, Pune ; Swedish Research Council[2020-03437]
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/27643]  
专题云南天文台_其他
作者单位1.INAF – Osservatorio Astronomico di Cagliari, via della Scienza 5, 09047 Selargius (CA), Italy
2.Departamento de Astronomía, Universidad de Chile, Las Condes, 7591245 Santiago, Chile;
3.Institute of Deep Space Sciences, Deep Space Exploration Laboratory, Hefei 230026, PR China;
4.Star and Planet Formation Laboratory, 0-0 S(RIKEN Cluster for Pioneering Research, Hirosawa 2-1, Wako, Saitama 351-0198, Japan;
5.School of Physics and Astronomy, Sun Yat-sen University, 2 Da Xue Road, Tangjia, Zhuhai 519000, Guangdong Province, PR China;
6.Ritter Astrophysical Research Center, University of Toledo, Toledo, OH 43606, USA;
7.Department of Physics, Texas State University, San Marcos, TX 78666, USA;
8.Department of Physics, Stockholm University, 10691 Stockholm, Sweden;
9.Space Science Institute, 4765 Walnut St., R203, Boulder, CO 80301, USA;
10.Astronomy Department, Ohio State University, Columbus, OH 43210, USA;
推荐引用方式
GB/T 7714		 Peeters, Els,Habart, Emilie,Berné, Olivier,et al. PDRs4All III. JWST's NIR spectroscopic view of the Orion Bar[J]. ASTRONOMY & ASTROPHYSICS,2024,685.
APA Peeters, Els.,Habart, Emilie.,Berné, Olivier.,Sidhu, Ameek.,Chown, Ryan.,...&Zhen, Junfeng.(2024).PDRs4All III. JWST's NIR spectroscopic view of the Orion Bar.ASTRONOMY & ASTROPHYSICS,685.
MLA Peeters, Els,et al."PDRs4All III. JWST's NIR spectroscopic view of the Orion Bar".ASTRONOMY & ASTROPHYSICS 685(2024).

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