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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 358789.0, MPI für Astronomie / Publikationen_mpia
Radio and millimeter properties of z~5.7 Lya emitters in the COSMOS field: limits on radio AGNs, submillimeter galaxies, and dust obscuration
Authors:Carilli, C. L.; Murayama, T.; Wang, R.; Schinnerer, E.; Taniguchi, Y.; Smolcic, V.; Bertoldi, F.; Ajiki, M.; Nagao, T.; Sasaki, S. S.; Shioya, Y.; Aguirre, J. E.; Blain, A. W.; Scoville, N.; Sanders, D. B.
Date of Publication (YYYY-MM-DD):2007
Title of Journal:The Astrophysical Journal Supplement Series
Start Page:518
End Page:522
Audience:Not Specified
Abstract / Description:We present observations at 1.4 and 250 GHz of the z~5.7 Lyalpha emitters (LAEs) in the COSMOS field found by Murayama et al. At 1.4 GHz there are 99 LAEs in the lower noise regions of the radio field. We do not detect any individual source down to 3 sigma limits of ~30 muJy beam-1 at 1.4 GHz, nor do we detect a source in a stacking analysis, to a 2 sigma limit of 2.5 muJy beam-1. At 250 GHz we do not detect any of the 10 LAEs that are located within the central regions of the COSMOS field covered by MAMBO (20'×20') to a typical 2 sigma limit of S250<2 mJy. The radio data imply that there are no low-luminosity radio AGNs with L1.4>6×1024 W Hz-1 in the LAE sample. The radio and millimeter observations also rule out any highly obscured, extreme starbursts in the sample, i.e., any galaxies with massive star formation rates >1500 Msolar yr-1 in the full sample (based on the radio data), or 500 Msolar yr-1 for the 10% of the LAE sample that falls in the central MAMBO field. The stacking analysis implies an upper limit to the mean massive star formation rate of ~100 Msolar yr-1. Based on data collected at the Subaru Telescope, which is operated by the National Astronomical Observatory of Japan; the National Radio Astronomy Observatory, which is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.; the IRAM 30 m telescope; and the Caltech Submillimeter Observatory.
Free Keywords:Galaxies: Evolution; Galaxies: Formation; Infrared: Galaxies; Submillimeter; Surveys
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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