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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 448303.0, MPI für Astronomie / Publikationen_mpia
Hubble Space Telescope/Advanced Camera for surveys morphology of Lyα emitters at redshift 5.7 in the COSMOS field
Authors:Taniguchi, Y.; Murayama, T.; Scoville, N. Z.; Sasaki, S. S.; Nagao, T.; Shioya, Y.; Saito, T.; Ideue, Y.; Nakajima, A.; Matsuoka, K.; Sanders, D. B.; Mobasher, B.; Aussel, H.; Capak, P.; Salvato, M.; Koekemoer, A.; Carilli, C.; Cimatti, A.; Ellis, R. S.; Garilli, B.; Giavalisco, M.; Ilbert, O.; Impey, C. D.; Kitzbichler, M. G.; LeFevre, O.; McCracken, H. J.; Scarlata, C.; Schinnerer, E.; Smolcic, V.; Tribiano, S.; Trump, J. R.
Date of Publication (YYYY-MM-DD):2009
Title of Journal:The Astrophysical Journal
Journal Abbrev.:ApJ
Issue / Number:2
Start Page:915
End Page:944
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present detailed morphological properties of Lyalpha emitters (LAEs) at z ≈ 5.7 in the COSMOS field based on Hubble Space Telescope Advanced Camera for Surveys (ACS) data. The ACS imaging in the F814W filter covered 85 LAEs of the 119 LAEs identified in the full two square degree field, and 47 LAEs of them are detected in the ACS images. Nearly half of them are spatially extended with a size larger than 0.15 arcsec (~0.88 kpc at z = 5.7) and up to 0.4 arcsec (~2.5 kpc at z = 5.7). The others are nearly unresolved compact objects. Two LAEs show double-component structures indicating interaction or merging of building components to form more massive galaxies. By stacking the ACS images of all the detected sources, we obtain a Sersic parameter of n ~ 0.7 with a half-light radius of 0.13 arcsec (0.76 kpc), suggesting that the majority of ACS detected LAEs have not spheroidal-like but disk-like or irregular light profiles. Comparing ACS F814W magnitudes (I 814) with Subaru/Suprime-Cam magnitudes in the NB816, i', and z' bands, we find that the ACS imaging in the F814W band mainly probes
Free Keywords:cosmology: observations; early universe; galaxies: evolution; galaxies: formation; galaxies: high-redshift
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2009ApJ...701..915T [ID No:1]
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