Properties of LBGs with [OIII] detection at z > 3: The importance of including nebular emission data in SED fitting. Issue Volume 15:Issue S341(2019) (November 2019)

• Record Type: Journal Article
• Authors: Yuan, Fang-Ting; Burgarella, Denis; Corre, David; Buat, Veronique; Boquien, Médéric; Shen, Shiyin
• Editors: Boquien, Médéric; Lusso, Elisabeta; Gruppioni, Carlotta; Tissera, Patricia
• Is Part Of: Proceedings of the International Astronomical Union. Volume 15:Issue S341(2019)
• Page Start: 201
• Page End: 205
• Publication Date: 2019-11
• Subjects: galaxies: high-redshift, -- galaxies: formation, -- galaxies: emission lines; Astronomy -- Congresses; Astronomy -- Periodicals; 520
• DOI: 10.1017/S174392131900276X
• Languages: English
• ISSNs: 1743-9213

Abstract

Abstract: At high redshift, the contribution of strong emission lines to the broadband photometry can cause large uncertainties when estimating galaxy physical properties. To examine this effect, we investigate a sample of 54 LBGs at 3 < z spec < 3.8 with detected [OIII] line emissions. We use CIGALE to fit simultaneously the rest-frame UV-to-NIR SEDs of these galaxies and their emission line data. By comparing the results with and without emission line data, we show that spectroscopic data are necessary to constrain the nebular model. We examine the K -band excess, which is usually used to estimate the emissions of [OIII]+H β lines when there is no spectral data, and find that the difference between the estimation and observation can reach up to > 1 dex for some galaxies, showing the importance of obtaining spectroscopic measurements of these lines. We also estimate the equivalent width of the H β absorption and find it negligible compared to the H β emission.