Deep Spectroscopic Survey of Lyman Break Galaxies at z~5

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dc.creatorAndo, M.
dc.creatorOhta, K.
dc.creatorIwata, I.
dc.creatorAkiyama, M.
dc.creatorAoki, K.
dc.creatorTamura, N.
dc.date2005-10-30
dc.date.accessioned2026-07-07T06:44:06Z
dc.date.available2026-07-07T06:44:06Z
dc.descriptionWe 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.
dc.description5 pages, 4 postscript figures. To appear in the proceedings of "The Fabulous Destiny of Galaxies: Bridging Past and Present", with minor corrections
dc.identifierhttps://arxiv.org/abs/astro-ph/0510830
dc.identifierhttp://arxiv.org/abs/astro-ph/0510830
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/102661
dc.subjectAstrophysics
dc.titleDeep Spectroscopic Survey of Lyman Break Galaxies at z~5
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