Starburst Energy Feedback Seen through HCO+/HOC+ Emission in NGC 253 from ALCHEMI

doi:10.3847/1538-4357/ac26b8

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	Starburst Energy Feedback Seen through HCO+/HOC+ Emission in NGC 253 from ALCHEMI
	Harada, Nanase 1,2,3; Martin, Sergio 4,5; Mangum, Jeffrey G.6; Sakamoto, Kazushi 2; Muller, Sebastien 7; Tanaka, Kunihiko 8; Nakanishi, Kouichiro 1,3; Herrero-Illana, Ruben 9,10; Yoshimura, Yuki 11; Muhle, Stefanie 12
刊名	ASTROPHYSICAL JOURNAL
	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.
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
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP Publishing Ltd
WOS记录号	WOS:000728520500001
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)
内容类型	期刊论文
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, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan 2.Acad Sinica, Inst Astron & Astrophys, 11F AS NTU Astron Math Bldg,Sec 4,Roosevelt Rd, Taipei 10617, Taiwan 3.Grad Univ Adv Studies SOKENDAI, Sch Sci, Dept Astron, 2-21-1 Osawa, Mitaka, Tokyo 1811855, Japan 4.European Southern Observ, Alonso Cordova 3107, Santiago 7630355, Chile 5.Joint ALMA Observ, Alonso Cordova 3107, Santiago 7630355, Chile 6.Natl Radio Astron Observ, 520 Edgemont Rd, Charlottesville, VA 22903 USA 7.Chalmers Univ Technol, Onsala Space Observ, Dept Space Earth & Environm, SE-43992 Onsala, Sweden 8.Keio Univ, Fac Sci & Technol, Dept Phys, 3-14-1 Hiyoshi, Yokohama, Kanagawa 2238522, Japan 9.European Southern Observ, Alonso Cordova 3107,Casilla 19001, Santiago, Chile 10.CSIC, Inst Space Sci ICE, Campus UAB, E-08193 Barcelona, 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.