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Title:
A Detailed Study of Gas and Star Formation in a Highly Magnified Lyman Break Galaxy at z = 3.07
Authors:
Coppin, K. E. K.; Swinbank, A. M.; Neri, R.; Cox, P.; Smail, Ian; Ellis, R. S.; Geach, J. E.; Siana, B.; Teplitz, H.; Dye, S.; Kneib, J.-P.; Edge, A. C.; Richard, J.
Affiliation:
AA(Institute for Computational Cosmology, Durham University, South Road, Durham, DH1 3LE, UK; .), AB(Institute for Computational Cosmology, Durham University, South Road, Durham, DH1 3LE, UK; .), AC(Institut de Radioastronomie Millimétrique (IRAM), 300 rue de la Piscine, Domaine Universitaire, 38406 Saint Martin d'Hères, France.), AD(Institut de Radioastronomie Millimétrique (IRAM), 300 rue de la Piscine, Domaine Universitaire, 38406 Saint Martin d'Hères, France.), AE(Institute for Computational Cosmology, Durham University, South Road, Durham, DH1 3LE, UK; .), AF(Caltech, MC 105-24, 1200 East California Boulevard, Pasadena, California, CA 91125.), AG(Institute for Computational Cosmology, Durham University, South Road, Durham, DH1 3LE, UK; .), AH(Spitzer Science Center, Caltech, MC 314-6, 1200 East California Boulevard, Pasadena, California, CA 91125.), AI(Spitzer Science Center, Caltech, MC 314-6, 1200 East California Boulevard, Pasadena, California, CA 91125.), AJ(School of Physics and Astronomy, Cardiff University, 5, The Parade, Cardiff, Wales, CF24AA, UK.), AK(Laboratoire d'Astrophysique de Marseille, Traverse du Siphon-B.P.8 13376, Marseille Cedec 12, France.), AL(Institute for Computational Cosmology, Durham University, South Road, Durham, DH1 3LE, UK; .), AM(Caltech, MC 105-24, 1200 East California Boulevard, Pasadena, California, CA 91125.)
Publication:
The Astrophysical Journal, Volume 665, Issue 2, pp. 936-943. (ApJ Homepage)
Publication Date:
08/2007
Origin:
UCP
ApJ Keywords:
Cosmology: Observations, Galaxies: Evolution, Galaxies: Formation, galaxies: individual (LBG J213512.73-010143), Galaxies: Kinematics and Dynamics, Galaxies: Starburst
DOI:
10.1086/519789
Bibliographic Code:
2007ApJ...665..936C

Abstract

We report the detection of CO(3-2) emission from a bright, gravitationally lensed Lyman Break galaxy, LBG J213512.73-010143 (the ``Cosmic Eye''), at z=3.07, using the Plateau de Bure Interferometer. This is only the second detection of molecular gas emission from an LBG and yields an intrinsic molecular gas mass of (2.4+/-0.4)×109 Msolar. The lens reconstruction of the UV morphology of the LBG indicates that it comprises two components separated by ~2 kpc. The CO emission is unresolved, θ<~3'', and appears to be centered on the intrinsically fainter (and also less highly magnified) of the two UV components. The width of the CO line indicates a dynamical mass of (8+/-2)×109csc2i Msolar within the central 2 kpc. Employing mid-infrared observations from Spitzer, we infer a stellar mass of M*~(6+/-2)×109 Msolar and a star formation rate of ~60 Msolar yr-1, indicating that the molecular gas will be consumed in <~40 Myr. The gas fractions, star formation efficiencies, and line widths suggests that LBG J213512 is a high-redshift, gas-rich analog of a local luminous infrared galaxy. This galaxy has a similar gas-to-dynamical mass fraction as observed in the submillimeter-selected population, although the gas surface density and star formation efficiency is a factor of 3 times less, suggesting less vigorous activity. We discuss the uncertainties in our conclusions arising from adopting a CO-to-H2 conversion factor appropriate for either the Milky Way or local luminous infrared galaxies. These observations demonstrate that current facilities, when aided by fortuitous gravitational magnification, can study ``ordinary'' galaxies at high redshift and so act as pathfinders for ALMA.
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