Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-10-30
Astronomy and Astrophysics
Astrophysics
5 pages, 4 postscript figures. To appear in the proceedings of "The Fabulous Destiny of Galaxies: Bridging Past and Present",
Scientific paper
We report results of deep optical spectroscopy with Subaru/FOCAS for Lyman Break Galaxy (LBG) candidates at z~5. So far, we made spectroscopic observations for 24 LBG candidates among ~200 bright (z'<25.0) LBG sample and confirmed 9 objects to be LBGs at z~5. Intriguingly, these bright LBGs show no or a weak Ly-alpha emission and relatively strong low ionization interstellar metal absorption lines. We also identified 2 faint (z'>25.0) objects to be at z~5 with their strong (EW_rest>20AA) Ly-alpha emission. Combining our results with other spectroscopic observations of galaxies at the similar redshift range, we found a clear luminosity dependence of EW_rest of Ly-alpha emission, i.e., the lack of strong Ly-alpha emission in bright LBGs. If the absence of Ly-alpha emission is due to dust absorption, these results suggest that bright LBGs at z~5 are in dusty and more chemically evolved environment than faint ones. This interpretation implies that bright LBGs started star formation earlier than faint ones, suggesting biased star formation.
Akiyama Masayuki
Ando Matthew
Aoki Kaori
Iwata Ikuru
Ohta Kazutoshi
No associations
LandOfFree
Deep Spectroscopic Survey of Lyman Break Galaxies at z~5 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Deep Spectroscopic Survey of Lyman Break Galaxies at z~5, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Deep Spectroscopic Survey of Lyman Break Galaxies at z~5 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-101512