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Submillimeter Galaxies as Tracers of Mass Assembly at Large M

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arxiv astro-ph/0403183 v1 pith:I2QISNI4 submitted 2004-03-08 astro-ph

R. Genzel , A.J. Baker , R.J. Ivison , F. Bertoldi , A.W. Blain , S.C. Chapman , P. Cox , R.I. Davies
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F. Eisenhauer D.T. Frayer T. Greve M.D. Lehnert D. Lutz N. Nesvadba R. Neri A. Omont S. Seitz I. Smail L.J. Tacconi M. Tecza N.A. Thatte R. Bender
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keywords galaxieshighmassessubmillimeteremissionluminousopticalrevealed
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Luminous submillimeter galaxies (SMGs) have been known for some time to produce a substantial fraction of the far-IR/submillimeter background. New observations show that these systems are not only very luminous, but also very massive. Here we present results from (a) a survey of SMGs' molecular line emission, which has confirmed Keck optical redshifts and revealed their high gas and dynamical masses; and (b) a detailed case study of the rest-frame optical emission from one SMG, which has revealed its high metallicity and old stellar population. We infer a high z~2.7 comoving number density of galaxies with baryonic masses greater than 10^11 solar masses; this is not accounted for in current semi-analytic models of galaxy evolution.

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