ALCHEMI, an ALMA Comprehensive High-resolution Extragalactic Molecular Inventory Survey presentation and first results from the ACA array

doi:10.1051/0004-6361/202141567

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	ALCHEMI, an ALMA Comprehensive High-resolution Extragalactic Molecular Inventory Survey presentation and first results from the ACA array
	Martin, S.1,2; Mangum, J. G.3; Harada, N.4,5,6; Costagliola, F.7; Sakamoto, K.5; Muller, S.7; Aladro, R.8; Tanaka, K.9; Yoshimura, Y.10; Nakanishi, K.4,6
刊名	ASTRONOMY & ASTROPHYSICS
	2021-12-03
卷号	656 页码:62
关键词	line identification galaxies ISM galaxies individual NGC 253 galaxies starburst ISM molecules submillimeter ISM
ISSN号	0004-6361
DOI	10.1051/0004-6361/202141567
通讯作者	Martin, S.(smartin@eso.org)
英文摘要	Context. The interstellar medium is the locus of physical processes affecting the evolution of galaxies which drive or are the result of star formation activity, supermassive black hole growth, and feedback. The resulting physical conditions determine the observable chemical abundances that can be explored through molecular emission observations at millimeter and submillimeter wavelengths. Aims. Our goal is to unveiling the molecular richness of the central region of the prototypical nearby starburst galaxy NGC 253 at an unprecedented combination of sensitivity, spatial resolution, and frequency coverage. Methods. We used the Atacama Large Millimeter/submillimeter Array (ALMA), covering a nearly contiguous 289 GHz frequency range between 84.2 and 373.2 GHz, to image the continuum and spectral line emission at 1.6 ''(similar to 28 pc) resolution down to a sensitivity of 30 - 50 mK. This article describes the ALMA Comprehensive High-resolution Extragalactic Molecular Inventory (ALCHEMI) large program. We focus on the analysis of the spectra extracted from the 15 '' (similar to 255 pc) resolution ALMA Compact Array data. Results. We modeled the molecular emission assuming local thermodynamic equilibrium with 78 species being detected. Additionally, multiple hydrogen and helium recombination lines are identified. Spectral lines contribute 5 to 36% of the total emission in frequency bins of 50 GHz. We report the first extragalactic detections of C2H5OH, HOCN, HC3HO, and several rare isotopologues. Isotopic ratios of carbon, oxygen, sulfur, nitrogen, and silicon were measured with multiple species. Concluison. Infrared pumped vibrationaly excited HCN, HNC, and HC3N emission, originating in massive star formation locations, is clearly detected at low resolution, while we do not detect it for HCO+. We suggest high temperature conditions in these regions driving a seemingly "carbon-rich" chemistry which may also explain the observed high abundance of organic species close to those in Galactic hot cores. The L-vib/L-IR ratio was used as a proxy to estimate a 3% contribution from the proto super star cluster to the global infrared emission. Measured isotopic ratios with high dipole moment species agree with those within the central kiloparsec of the Galaxy, while those derived from C-13/O-18 are a factor of five larger, confirming the existence of multiple interstellar medium components within NGC 253 with different degrees of nucleosynthesis enrichment. The ALCHEMI data set provides a unique template for studies of star-forming galaxies in the early Universe.
资助项目	JSPS KAKENHI[JP21K03634] ; JSPS KAKENHI[JP17H06130] ; MOST[108-2112-M-001-015] ; MOST[109-2112-M-001-020] ; Spanish State Research Agency (AEI)[ESP2017-86582-C4-1-R] ; Comunidad de Madrid through the Atraccion de Talento Investigador Senior Grant (COOL: Cosmic Origins Of Life)[2019-T1/TIC-15379] ; State Agency for Research of the Spanish MCIU[AYA2017-84390-C2-1-R] ; FEDER ; Center of Excellence Severo Ochoa award[SEV-2017-0709] ; INAF PRIN-SKA 2017 program[1.05.01.88.04] ; NAOJ ALMA Scientific Research[2017-06B]
WOS关键词	GALAXY NGC 253 ; COMPLEX ORGANIC-MOLECULES ; SPECTRAL-LINE SURVEY ; SUPER STAR-CLUSTERS ; NEARBY GALAXIES ; DENSE GAS ; GALACTIC-CENTER ; CARBON-MONOXIDE ; INTERSTELLAR-MEDIUM ; X-RAY
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	EDP SCIENCES S A
WOS记录号	WOS:000725877600015
资助机构	JSPS KAKENHI ; MOST ; Spanish State Research Agency (AEI) ; Comunidad de Madrid through the Atraccion de Talento Investigador Senior Grant (COOL: Cosmic Origins Of Life) ; State Agency for Research of the Spanish MCIU ; FEDER ; Center of Excellence Severo Ochoa award ; INAF PRIN-SKA 2017 program ; NAOJ ALMA Scientific Research
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/4398]
专题	研究单元未命名
通讯作者	Martin, S.
作者单位	1.European Southern Observ, Alonso Cordova 3107, Santiago 7630355, Chile 2.Joint ALMA Observ, Alonso de Cordova 3107, Santiago 7630355, Chile 3.Natl Radio Astron Observ, 520 Edgemt Rd, Charlottesville, VA 22903 USA 4.Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo, Japan 5.Acad Sinica, Inst Astron & Astrophys, 11F AS NTU Astron Math Bldg,1,Sec 4,Roosevelt Rd, Taipei 10617, Taiwan 6.Grad Univ Adv Studies SOKENDAI, Sch Sci, Dept Astron, 2-21-1 Osawa, Mitaka, Tokyo 1811855, Japan 7.Chalmers Univ Technol, Onsala Space Observ, Dept Space Earth & Environm, S-43992 Onsala, Sweden 8.Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany 9.Keio Univ, Fac Sci & Technol, Dept Phys, 3-14-1 Hiyoshi, Yokohama, Kanagawa 2238522, Japan 10.Univ Tokyo, Grad Sch Sci, Inst Astron, 2-21-1 Osawa, Mitaka, Tokyo 1810015, Japan
推荐引用方式 GB/T 7714	Martin, S.,Mangum, J. G.,Harada, N.,et al. ALCHEMI, an ALMA Comprehensive High-resolution Extragalactic Molecular Inventory Survey presentation and first results from the ACA array[J]. ASTRONOMY & ASTROPHYSICS,2021,656:62.
APA	Martin, S..,Mangum, J. G..,Harada, N..,Costagliola, F..,Sakamoto, K..,...&Yan, Y. T..(2021).ALCHEMI, an ALMA Comprehensive High-resolution Extragalactic Molecular Inventory Survey presentation and first results from the ACA array.ASTRONOMY & ASTROPHYSICS,656,62.
MLA	Martin, S.,et al."ALCHEMI, an ALMA Comprehensive High-resolution Extragalactic Molecular Inventory Survey presentation and first results from the ACA array".ASTRONOMY & ASTROPHYSICS 656(2021):62.