Starburst Energy Feedback Seen through HCO+/HOC+ Emission in NGC 253 from ALCHEMI
文献类型：期刊论文
| 作者 | Harada, Nanase21,22,23; Martin, Sergio19,20; Mangum, Jeffrey G.18; Sakamoto, Kazushi22; Muller, Sebastien17; Tanaka, Kunihiko16; Nakanishi, Kouichiro21,23; Herrero-Illana, Ruben14,15; Yoshimura, Yuki13; Muhle, Stefanie12 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2021-12-01 |
| 卷号 | 923期号:1页码:40 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ac26b8 |
| 通讯作者 | Harada, Nanase(nanase.harada@nao.ac.jp) |
| 英文摘要 | Molecular abundances are sensitive to the UV photon flux and cosmic-ray ionization rate. In starburst environments, the effects of high-energy photons and particles are expected to be stronger. We examine these astrochemical signatures through multiple transitions of HCO+ and its metastable isomer HOC+ in the center of the starburst galaxy NGC 253 using data from the Atacama Large Millimeter/submillimeter Array large program ALMA Comprehensive High-resolution Extragalactic Molecular inventory. The distribution of the HOC+(1-0) integrated intensity shows its association with "superbubbles," cavities created either by supernovae or expanding H ii regions. The observed HCO+/HOC+ abundance ratios are similar to 10-150, and the fractional abundance of HOC+ relative to H-2 is similar to 1.5 x 10(-11)-6 x 10(-10), which implies that the HOC+ abundance in the center of NGC 253 is significantly higher than in quiescent spiral arm dark clouds in the Galaxy and the Galactic center clouds. Comparison with chemical models implies either an interstellar radiation field of G (0) greater than or similar to 10(3) if the maximum visual extinction is greater than or similar to 5, or a cosmic-ray ionization rate of zeta greater than or similar to 10(-14) s(-1) (3-4 orders of magnitude higher than that within clouds in the Galactic spiral arms) to reproduce the observed results. From the difference in formation routes of HOC+, we propose that a low-excitation line of HOC+ traces cosmic-ray dominated regions, while high-excitation lines trace photodissociation regions. Our results suggest that the interstellar medium in the center of NGC 253 is significantly affected by energy input from UV photons and cosmic rays, sources of energy feedback. |
| WOS关键词 | COSMIC-RAY IONIZATION ; SUPER STAR-CLUSTERS ; MOLECULAR GAS ; LINE SURVEY ; CHANDRA OBSERVATIONS ; INTERSTELLAR CLOUDS ; STELLAR CLUSTERS ; COLOGNE DATABASE ; VLA OBSERVATIONS ; ABUNDANCE RATIO |
| 资助项目 | JSPS KAKENHI[JP21K03634] ; Ministry of Science and Technology, Taiwan[MOST 108-2112-M-001-015] ; Ministry of Science and Technology, Taiwan[109-2112-M-001-020] ; NAOJ ALMA Scientific Research grant[2017-06B] ; Comunidad de Madrid through the Atraccion de Talento Investigador (Doctores con experiencia) Grant (COOL: Cosmic Origins Of Life)[2019-T1/TIC-15379] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000728520500001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | JSPS KAKENHI ; Ministry of Science and Technology, Taiwan ; NAOJ ALMA Scientific Research grant ; Comunidad de Madrid through the Atraccion de Talento Investigador (Doctores con experiencia) Grant (COOL: Cosmic Origins Of Life) |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/4401]  |
| 专题 | 研究单元未命名 |
| 通讯作者 | Harada, Nanase |
| 作者单位 | 1.Natl Astron Observ Japan, ALMA Project, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan 2.Natl Radio Astron Observ, POB O,1003 Lopezville Rd, Socorro, NM 87801 USA 3.New Mexico Inst Min & Technol, 801 Leroy Pl, Socorro, NM 87801 USA 4.UCL, Dept Phys & Astron, Gower St, London WC1E 6BT, England 5.Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands 6.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 7.King Abdulaziz Univ, Dept Astron, Fac Sci, POB 80203, Jeddah 21589, Saudi Arabia 8.Univ Virginia, Dept Astron, POB 400325,530 McCormick Rd, Charlottesville, VA 22904 USA 9.INAF Osservatorio Astrofis Arcetri, Largo Enrico Fermi 5, I-50125 Florence, Italy 10.Ctr Astrobiol CSIC INTA, Ctra Ajalvir Km 4, E-28850 Madrid, Spain |
| 推荐引用方式 GB/T 7714 | Harada, Nanase,Martin, Sergio,Mangum, Jeffrey G.,et al. Starburst Energy Feedback Seen through HCO+/HOC+ Emission in NGC 253 from ALCHEMI[J]. ASTROPHYSICAL JOURNAL,2021,923(1):40. |
| APA | Harada, Nanase.,Martin, Sergio.,Mangum, Jeffrey G..,Sakamoto, Kazushi.,Muller, Sebastien.,...&Viti, Serena.(2021).Starburst Energy Feedback Seen through HCO+/HOC+ Emission in NGC 253 from ALCHEMI.ASTROPHYSICAL JOURNAL,923(1),40. |
| MLA | Harada, Nanase,et al."Starburst Energy Feedback Seen through HCO+/HOC+ Emission in NGC 253 from ALCHEMI".ASTROPHYSICAL JOURNAL 923.1(2021):40. |
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来源：新疆天文台
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