Properties of LBGs with [OIII] detection at z similar to 3.5 The importance of including nebular emission data in SED fitting

doi:10.1051/0004-6361/201935975

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	Properties of LBGs with [OIII] detection at z similar to 3.5 The importance of including nebular emission data in SED fitting
	Yuan, Fang-Ting 1; Burgarella, Denis 2; Corre, David 2; Buat, Veronique 2; Boquien, Mederic 3; Shen, Shiyin 1
刊名	ASTRONOMY & ASTROPHYSICS
	2019-11-05
卷号	631 页码:12
关键词	galaxies: evolution galaxies: high-redshift
ISSN号	0004-6361
DOI	10.1051/0004-6361/201935975
英文摘要	Context. Nebular emission lines are critical to measure physical properties in the ionized gas (e.g., metallicity, the star formation rate, or dust attenuation). They also account for a significant fraction of broadband fluxes, in particular at the highest redshifts, and therefore can strongly affect the determination of other physical properties, such as the stellar mass, which are crucial in shaping our understanding of galaxy formation and evolution. Aims. We investigate a sample of 51 Lyman break galaxies at 3.0 < z(spec) < 3.8 with detected [OIII] line emissions and estimated the physical properties of these galaxies to examine the impact of including nebular emission data in the Spectral energy distribution (SED) fitting. Methods. We used the Code Investigating GALaxy Emission (CIGALE) to fit the rest-frame ultraviolet-to-near-infrared SEDs of these galaxies and their emission line data simultaneously. We ran CIGALE with and without the nebular model or the emission line data, and compare the results to show the importance of including the nebular emission line data in the SED fitting. Results. We find that without the nebular model, the SED fitting overestimates the stellar mass due to the strong [OIII] lines that are redshifted to the K-s-band, which is consistent with previous results. The emission line data are necessary to constrain the nebular model in the SED fitting. We examine the K-s-band excess, which is mostly used to estimate the emissions of the [OIII]+H beta lines when there is no spectral data, and we find that the estimation and observation are statistically consistent. However, the difference can reach up to more than 1 dex in some catastrophic cases, which shows the importance of obtaining spectroscopic measurements for these lines. We also estimate the equivalent width of the H beta absorption and find it negligible compared to the H beta emission. Conclusions. Line emission is important to constrain the nebular models and to obtain reliable estimates of the physical properties of galaxies. These data should be taken into account in the SED fitting.
资助项目	National Natural Science Foundation of China (NSFC)[11433003] ; National Natural Science Foundation of China (NSFC)[11573050] ; China-Chile joint grant from CASSACA ; Natural Science Foundation of Shanghai[17ZR1435900] ; FONDECYT regular grant[1170618] ; 3D-HST Treasury Program[GO 12177] ; 3D-HST Treasury Program[12328] ; NASA[NAS5-26555]
WOS关键词	STAR-FORMING GALAXIES ; LYMAN-BREAK GALAXIES ; MASS ; METALLICITY ; POPULATION ; IMPACT ; GAS
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	EDP SCIENCES S A
WOS记录号	WOS:000515097000002
资助机构	National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; China-Chile joint grant from CASSACA ; China-Chile joint grant from CASSACA ; Natural Science Foundation of Shanghai ; Natural Science Foundation of Shanghai ; FONDECYT regular grant ; FONDECYT regular grant ; 3D-HST Treasury Program ; 3D-HST Treasury Program ; NASA ; NASA ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; China-Chile joint grant from CASSACA ; China-Chile joint grant from CASSACA ; Natural Science Foundation of Shanghai ; Natural Science Foundation of Shanghai ; FONDECYT regular grant ; FONDECYT regular grant ; 3D-HST Treasury Program ; 3D-HST Treasury Program ; NASA ; NASA ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; China-Chile joint grant from CASSACA ; China-Chile joint grant from CASSACA ; Natural Science Foundation of Shanghai ; Natural Science Foundation of Shanghai ; FONDECYT regular grant ; FONDECYT regular grant ; 3D-HST Treasury Program ; 3D-HST Treasury Program ; NASA ; NASA ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; China-Chile joint grant from CASSACA ; China-Chile joint grant from CASSACA ; Natural Science Foundation of Shanghai ; Natural Science Foundation of Shanghai ; FONDECYT regular grant ; FONDECYT regular grant ; 3D-HST Treasury Program ; 3D-HST Treasury Program ; NASA ; NASA
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/54470]
专题	中国科学院国家天文台
通讯作者	Yuan, Fang-Ting
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Nandan Rd 80, Shanghai 200030, Peoples R China 2.Aix Marseille Univ, CNRS, LAM, UMR 7326, F-13388 Marseille, France 3.Univ Antofagasta, Ctr Astron CITEVA, Ave Angamos 601, Antofagasta, Chile
推荐引用方式 GB/T 7714	Yuan, Fang-Ting,Burgarella, Denis,Corre, David,et al. Properties of LBGs with [OIII] detection at z similar to 3.5 The importance of including nebular emission data in SED fitting[J]. ASTRONOMY & ASTROPHYSICS,2019,631:12.
APA	Yuan, Fang-Ting,Burgarella, Denis,Corre, David,Buat, Veronique,Boquien, Mederic,&Shen, Shiyin.(2019).Properties of LBGs with [OIII] detection at z similar to 3.5 The importance of including nebular emission data in SED fitting.ASTRONOMY & ASTROPHYSICS,631,12.
MLA	Yuan, Fang-Ting,et al."Properties of LBGs with [OIII] detection at z similar to 3.5 The importance of including nebular emission data in SED fitting".ASTRONOMY & ASTROPHYSICS 631(2019):12.