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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 308546.0, MPI für Astronomie / Publikationen_mpia
Lya emission galaxies at a redshift of z ~ 5.7 in the FORS deep field
Authors:Tapken, C.; Appenzeller, I.; Gabasch, A.; Heidt, J.; Hopp, U.; Bender, R.; Mehlert, D.; Noll, S.; Seitz, S.; Seifert, W.
Date of Publication (YYYY-MM-DD):2006
Journal Abbrev.:Astronomy and Astrophysics
Start Page:145
End Page:152
Audience:Not Specified
Abstract / Description:Context: .We present the results of a search for Lyalpha emission galaxies at z≈5.7 in the FORS Deep Field.<BR /> Aims: .The objective of this study is to improve the faint end of the luminosity function of high-redshift Lyalpha emitting galaxies and to derive properties of intrinsically faint Lyalpha emission galaxies in the young universe. <BR /> Methods: .Using FORS2 at the ESO VLT and a set of special interference filters, we identified candidates for high-redshift Lyalpha galaxies. We then used FORS2 in spectroscopic mode to verify the identifications and to study their spectral properties.<BR /> Results: .The narrow-band photometry resulted in the detection of 15 likely Lyalpha emission galaxies. Spectra with an adequate exposure time could be obtained for eight galaxies. In all these cases the presence of Lyalpha emission at z ≈ 5.7 was confirmed spectroscopically. The line fluxes of the 15 candidates range between 3 × 10-21 W m-2 and 16 × 10-21 W m-2, which corresponds to star-formation rates uncorrected for dust absorption between 1 and 5 {M}⊙ yr-1. The luminosity function derived for our photometrically identified objects extends the published luminosity functions of intrinsically brighter Lyalpha galaxies.<BR /> Conclusions: .With this technique the study of high-redshift Lyalpha emission galaxies can be extended to low intrinsic luminosities.
Free Keywords:galaxies: high-redshift; galaxies: quasars: emission lines
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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