PDRs4All VIII. Mid-infrared emission line inventory of the Orion Bar
文献类型：期刊论文
| 作者 | De Putte, Dries Van55; Meshaka, Raphael53,54; Trahin, Boris54,55; Habart, Emilie54; Peeters, Els50,51,52; Berné, Olivier49; Alarcón, Felipe48; Canin, Amélie49; Chown, Ryan47,51,52; Schroetter, Ilane49 |
| 刊名 | Astronomy and Astrophysics
 |
| 出版日期 | 2024-07-01 |
| 卷号 | 687 |
| 关键词 | ISM: atoms ISM: lines and bands ISM: molecules photon dominated region (PDR) infrared: ISM |
| ISSN号 | 0004-6361 |
| DOI | 10.1051/0004-6361/202449295 |
| 产权排序 | 第30完成单位 |
| 文献子类 | Journal article (JA) |
| 英文摘要 | Context. Mid-infrared emission features are important probes of the properties of ionized gas and hot or warm molecular gas, which are difficult to probe at other wavelengths. The Orion Bar photodissociation region (PDR) is a bright, nearby, and frequently studied target containing large amounts of gas under these conditions. Under the "PDRs4All" Early Release Science Program for JWST, a part of the Orion Bar was observed with MIRI integral field unit (IFU) spectroscopy, and these high-sensitivity IR spectroscopic images of very high angular resolution (0.2′′) provide a rich observational inventory of the mid-infrared (MIR) emission lines, while resolving the H II region, the ionization front, and multiple dissociation fronts. Aims. We list, identify, and measure the most prominent gas emission lines in the Orion Bar using the new MIRI IFU data. An initial analysis summarizes the physical conditions of the gas and demonstrates the potential of these new data and future IFU observations with JWST. Methods. The MIRI IFU mosaic spatially resolves the substructure of the PDR, its footprint cutting perpendicularly across the ionization front and three dissociation fronts. We performed an up-to-date data reduction, and extracted five spectra that represent the ionized, atomic, and molecular gas layers. We identified the observed lines through a comparison with theoretical line lists derived from atomic data and simulated PDR models. The identified species and transitions are summarized in the main table of this work, with measurements of the line intensities and central wavelengths. Results. We identified around 100 lines and report an additional 18 lines that remain unidentified. The majority consists of H I recombination lines arising from the ionized gas layer bordering the PDR. The H I line ratios are well matched by emissivity coefficients from H recombination theory, but deviate by up to 10% because of contamination by He I lines. We report the observed emission lines of various ionization stages of Ne, P, S, Cl, Ar, Fe, and Ni. We show how the Ne III/Ne II, S IV/S III, and Ar III/Ar II ratios trace the conditions in the ionized layer bordering the PDR, while Fe III/Fe II and Ni III/Ni II exhibit a different behavior, as there are significant contributions to Fe II and Ni II from the neutral PDR gas. We observe the pure-rotational H2 lines in the vibrational ground state from 0–0 S(1) to 0–0 S(8), and in the first vibrationally excited state from 1–1 S(5) to 1–1 S(9). We derive H2 excitation diagrams, and for the three observed dissociation fronts, the rotational excitation can be approximated with one thermal (∼700 K) component representative of an average gas temperature, and one nonthermal component (∼2700 K) probing the effect of UV pumping. We compare these results to an existing model of the Orion Bar PDR, and find that the predicted excitation matches the data qualitatively, while adjustments to the parameters of the PDR model are required to reproduce the intensity of the 0–0 S(6) to S(8) lines. © The Authors 2024. |
| 学科主题 | 天文学 ; 恒星与银河系 |
| URL标识 | 查看原文 |
| 资助项目 | Deutsche Forschungsgemeinschaft[184018867] |
| 语种 | 英语 |
| 资助机构 | Deutsche Forschungsgemeinschaft[184018867] |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/27463]  |
| 专题 | 云南天文台_其他 |
| 作者单位 | 1.Delft University of Technology, Delft, Netherlands; 2.European Space Astronomy Centre (ESAC/ESA), Villanueva de la Cañada, Madrid, 28692, Spain 3.National Radio Astronomy Observatory (NRAO), 520 Edgemont Road, Charlottesville, VA, 22903, United States; 4.Department of Chemistry, The University of British Columbia, Vancouver, BC, Canada; 5.Institut de Physique de Rennes, UMR CNRS 6251, Université de Rennes 1, Campus de Beaulieu, Rennes, Cedex 35042, France; 6.Department of Chemistry, GITAM school of Science, GITAM Deemed to be University, Bangalore, India; 7.Laboratoire de Physique des deux infinis Irène Joliot-Curie, Université Paris-Saclay, CNRS, IN2P3, Bâtiment 104, Orsay, Cedex 91405, France; 8.Anton Pannekoek Institute for Astronomy, University of Amsterdam, Netherlands; 9.Department of Physics, Wellesley College, 106 Central Street, Wellesley, MA, 02481, United States; 10.School of Physics, University of Hyderabad, Telangana, Hyderabad, 500046, India; |
| 推荐引用方式 GB/T 7714 | De Putte, Dries Van,Meshaka, Raphael,Trahin, Boris,et al. PDRs4All VIII. Mid-infrared emission line inventory of the Orion Bar[J]. Astronomy and Astrophysics,2024,687. |
| APA | De Putte, Dries Van.,Meshaka, Raphael.,Trahin, Boris.,Habart, Emilie.,Peeters, Els.,...&Pendleton, Yvonne J..(2024).PDRs4All VIII. Mid-infrared emission line inventory of the Orion Bar.Astronomy and Astrophysics,687. |
| MLA | De Putte, Dries Van,et al."PDRs4All VIII. Mid-infrared emission line inventory of the Orion Bar".Astronomy and Astrophysics 687(2024). |
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