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Astron. Astrophys. 341, 348-354 (1999)

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A survey of molecular gas content of galaxies at 0.08 < z < 1.06

K.-Y. Lo 1,2,3, H.-W. Chen 2,4 and P.T.P. Ho 5

1 Max-Planck-Institut für Extraterrestrische Physik, Postfach 1603, D-85740 Garching, Germany
2 Astronomy Department, University of Illinois, 1002 West Green Street, Urbana, IL 61801, USA
3 Institute of Astronomy and Astrophysics, Academia Sinica, Taipei 115, Taiwan, ROC
4 Department of Physics and Astronomy, State University of New York, Stony Brook, NY 11794, USA
5 Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02128, USA

Received 24 July 1998 / Accepted 30 September 1998


The study of high redshift galaxies has made tremendous progress in the last few years. In order to understand their evolution, it is important to probe the gas content of distant "normal" galaxies beyond z [FORMULA] 0.3. We searched for CO emission from a sample of galaxies in the redshift range of 0.35 to 1.06. Given the current limited sensitivity, we can only place upper limits to the gas content of these progenitors to luminous field galaxies of [FORMULA]. We also searched a sample of distant luminous IR galaxies and detected two new galaxies at z [FORMULA]. The upper limits to and the detection of CO emission from these distant galaxies are consistent with the suggested upper limit to galaxy masses of [FORMULA] posed by the cooling time argument.

Key words: submillimeter – galaxies: ISM – galaxies: evolution – ISM: molecules

Send offprint requests to: K.-Y. Lo (kyl@biaa.sinica.edu.tw)

© European Southern Observatory (ESO) 1999

Online publication: December 4, 1998