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Title:
A Compact Starburst Core in the Dusty Lyman Break Galaxy Westphal-MD11
Authors:
Baker, Andrew J.; Tacconi, Linda J.; Genzel, Reinhard; Lutz, Dieter; Lehnert, Matthew D.
Affiliation:
AA(), AB(Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, D-85741 Garching, Germany; , , , , ), AC(Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, D-85741 Garching, Germany; , , , , ; Also at Department of Physics, University of California at Berkeley, 366 Le Conte Hall, Berkeley, CA 94720-7300.), AD(Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, D-85741 Garching, Germany; , , , , ), AE(Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, D-85741 Garching, Germany; , , , , )
Publication:
The Astrophysical Journal, Volume 613, Issue 2, pp. L113-L116. (ApJL Homepage)
Publication Date:
10/2004
Origin:
UCP
ApJ Keywords:
Cosmology: Observations, Galaxies: ISM, Galaxies: Starburst
DOI:
10.1086/425174
Bibliographic Code:
2004ApJ...613L.113B

Abstract

Using the IRAM Plateau de Bure Interferometer, we have searched for CO (3-2) emission from the dusty Lyman break galaxy Westphal-MD11 at z=2.98. Our sensitive upper limit is surprisingly low relative to the system's 850 μm flux density and implies a far-IR/CO luminosity ratio as elevated as those seen in local ultraluminous mergers. We conclude that the observed dust emission must originate in a compact structure radiating near its blackbody limit and that a relatively modest molecular gas reservoir must be fueling an intense nuclear starburst (and/or deeply buried active nucleus) that may have been triggered by a major merger. In this regard, Westphal-MD11 contrasts strikingly with the lensed Lyman break galaxy MS 1512-cB58, which is being observed apparently midway through an extended episode of more quiescent disk star formation.

Based on observations carried out with the IRAM Plateau de Bure Interferometer. IRAM is supported by the Institut National des Sciences de l'Univers/CNRS (France), the Max-Planck-Gesellschaft (Germany), and the Instituto Geográfico Nacional (Spain).

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