A Compact Starburst Core in the Dusty Lyman Break Galaxy Westphal-MD11

Details A Compact Starburst Core in the Dusty Lyman Break Galaxy Westphal-MD11 A Compact Starburst Core in the Dusty Lyman Break Galaxy Westphal-MD11

2004-08-18

arxiv.org/abs/astro-ph/0408337v1

Astrophys.J. 613 (2004) L113-L116

Astronomy and Astrophysics

Astrophysics

5 pages, 1 figure (emulateapj), accepted by ApJL

Scientific paper

10.1086/425174

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 um 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 fuelling 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 MS1512-cB58, which is being observed apparently midway through an extended episode of more quiescent disk star formation.

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