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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 719963.0, MPI für Astronomie / Publikationen_mpia
Discovery of massive, mostly star formation quenched galaxies with extremely large Lyα equivalent widths at z ˜ 3
Authors:Taniguchi, Y.; Kajisawa, M.; Kobayashi, M. A. R.; Nagao, T.; Shioya, Y.; Scoville, N. Z.; Sanders, D. B.; Capak, P. L.; Koekemoer, A. M.; Toft, S.; McCracken, H. J.; Le Fèvre, O.; Tasca, L.; Sheth, K.; Renzini, A.; Lilly, S.; Carollo, M.; Kovač, K.; Ilbert, O.; Schinnerer, E.; Fu, H.; Tresse, L.; Griffiths, R. E.; Civano, F.
Date of Publication (YYYY-MM-DD):2015
Title of Journal:The Astrophysical Journal Letters
Issue / Number:1
Start Page:id. L7 (6 pp)
Audience:Not Specified
Abstract / Description:We report a discovery of six massive galaxies with both extremely large Lyα equivalent widths (EWs) and evolved stellar populations at z ˜ 3. These MAssive Extremely STrong Lyα emitting Objects (MAESTLOs) have been discovered in our large-volume systematic survey for strong Lyα emitters (LAEs) with 12 optical intermediate-band data taken with Subaru/Suprime-Cam in the COSMOS field. Based on the spectral energy distribution fitting analysis for these LAEs, it is found that these MAESTLOs have (1) large rest-frame EWs of EW0 (Lyα) ˜ 100-300 Å, (2) M ˜ 1010.5-1011.1 M, and (3) relatively low specific star formation rates of SFR/M ˜ 0.03-1 Gyr-1. Three of the six MAESTLOs have extended Lyα emission with a radius of several kiloparsecs, although they show very compact morphology in the HST/ACS images, which correspond to the rest-frame UV continuum. Since the MAESTLOs do not show any evidence for active galactic nuclei, the observed extended Lyα emission is likely to be caused by a star formation process including the superwind activity. We suggest that this new class of LAEs, MAESTLOs, provides a missing link from star-forming to passively evolving galaxies at the peak era of the cosmic star formation history. Based on observations with NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS 5-26555; also based on data collected at the Subaru Telescope, which is operated by the National Astronomical Observatory of Japan; and also based on data products from observations made with ESO Telescopes at the La Silla Paranal Observatory under ESO programme ID 179.A-2005 and on data products produced by TERAPIX and the Cambridge Astronomy Survey Unit on behalf of the UltraVISTA consortium.
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
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