Properties and morphologies of Lyman break galaxies at z similar to 1 in the Chandra Deep Field South, inferred from spectral energy distributions

	Properties and morphologies of Lyman break galaxies at z similar to 1 in the Chandra Deep Field South, inferred from spectral energy distributions
	Chen, Z.1,2,3; Shu, C. G.1,2; Burgarella, D.3; Buat, V.3; Huang, J. -S.4; Luo, Z. J.2
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2013-05-01
卷号	431 期号:3 页码:2080-2105
关键词	galaxies: evolution galaxies: formation galaxies: luminosity function galaxies: statistics galaxies: structure mass function
英文摘要	After carefully cross-identifying previously discovered - and selected by the Galaxy Evolution Explorer (GALEX) - Lyman break galaxy (LBG) candidates one-to-one with their optical counterparts in the field of the Chandra Deep Field South (CDF-S), we re-estimate their photometric redshifts using multiwavelength data from ultraviolet and optical to near-infrared. Considering their re-estimated photometric redshifts and spectral energy distributions, we refine a new updated sample of 383 LBGs at 0.7 less than or similar to z less than or similar to 1.4, with two confirmed active galactic nuclei being excluded. There are 260 and 111 LBGs classified as starburst and irregular types, respectively. The ages of the LBGs span from several Myr to 1.5 Gyr with a median of similar to 50 Myr. Their dust-corrected star formation rates (SFRs) and stellar masses (M-) are 4-220 M-circle dot yr(-1) and from 2.3 x 10(8) to 4 x 10(11) M-circle dot, with median values of similar to 25 M-circle dot yr(-1) and similar to 10(10) M-circle dot. The rest-frame far-ultraviolet luminosity function of the LBGs is presented with the best-fitting Schechter parameters of alpha = -1.61 +/- 0.40, M = -20.40 +/- 0.22 and phi* = (0.89 +/- 0.30) x 10(-3) Mpc(-3) dex(-1). LBGs of irregular types are mainly distributed along the main sequence of star-forming galaxies, while most LBGs of starburst types are located in the starburst region. Together with previous studies, we suggest that the star formation mode for LBGs at z > 3 is mainly starburst, and that it evolves to be more significant to the quenching mode after z similar to 3. A downsizing effect is clearly found, and we discuss the physical implications and comparisons with previous studies in detail. LBGs with larger SFRs are, on average, more compact. In the rest-frame colour (U - B)-M-* diagram, LBGs are distributed in the 'blue' cloud. We suggest that LBGs might evolve along the blue cloud from later to earlier types. The Hubble Space Telescope images in F606W (V band) and F850LP (z band) are taken from the Galaxy Evolution from Morphology and SEDs (GEMS) survey and the Great Observatories Origins Deep Survey South (GOODS-S) for morphological studies of LBGs. SEXTRACTOR and GALFIT are applied in order to obtain their morphological parameters. We establish an image gallery of 277 LBGs, commonly detected in both bands, by visually classifying individual LBGs into the following types: chain, spiral, tadpole, bulge and clump. We define a morphological sample of 142 LBGs with reliable results of Sersic indices and sizes in both bands. We find that LBGs at z similar to 1 are dominated by disc-like galaxies, with median sizes of 2.34 and 2.68 kpc in F606W and F850LP, respectively. The correlations between the photometric and morphological properties of LBGs are investigated. Strong correlations between their half-light radii and M-* (i.e. size-stellar mass relations) are found in both bands. We discuss the physical connections between the correlations and the downsizing effect.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	STAR-FORMING GALAXIES ; DIGITAL SKY SURVEY ; HUBBLE-SPACE-TELESCOPE ; HIGH-REDSHIFT GALAXIES ; ULTRAVIOLET-LUMINOUS GALAXIES ; FRAME OPTICAL-PROPERTIES ; MASS-SIZE RELATION ; YALE-CHILE MUSYC ; STELLAR MASS ; FORMATION HISTORY
收录类别	SCI
语种	英语
WOS记录号	WOS:000318347500006
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/18012]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Shanghai Normal Univ, Shanghai Key Lab Astrophys, Shanghai 200234, Peoples R China 3.Observ Astron Marseille Provence, Lab Astrophys Marseille, F-13012 Marseille, France 4.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
推荐引用方式 GB/T 7714	Chen, Z.,Shu, C. G.,Burgarella, D.,et al. Properties and morphologies of Lyman break galaxies at z similar to 1 in the Chandra Deep Field South, inferred from spectral energy distributions[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2013,431(3):2080-2105.
APA	Chen, Z.,Shu, C. G.,Burgarella, D.,Buat, V.,Huang, J. -S.,&Luo, Z. J..(2013).Properties and morphologies of Lyman break galaxies at z similar to 1 in the Chandra Deep Field South, inferred from spectral energy distributions.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,431(3),2080-2105.
MLA	Chen, Z.,et al."Properties and morphologies of Lyman break galaxies at z similar to 1 in the Chandra Deep Field South, inferred from spectral energy distributions".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 431.3(2013):2080-2105.