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Astron. Astrophys. 330, 63-66 (1998)

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A sensitive search for CO emission from faint blue galaxies at z ~ 0.5

C.D. Wilson 1 and F. Combes 2

1 Department of Physics & Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada (wilson@physics.mcmaster.ca)
2 DEMIRM, Observatoire de Paris, 61 Av. de l'Observatoire, F-75014 Paris, France (bottaro@mesioa.obspm.fr)

Received 18 September 1997 / Accepted 19 September 1997


We have obtained sensitive upper limits on the CO J=2-1 and CO J=3-2 emission lines for five faint blue galaxies with redshifts [FORMULA] using the IRAM 30 m telescope. These observations would have been able to detect the luminous infrared galaxy IRAS F10214+4724 if it were located at this redshift and unlensed. However, they are not sensitive enough to detect the prototype starburst galaxy M82 or the HII galaxy UM448 if they were located at this redshift. Our upper limits for the CO emission are consistent with between 19% and 66% of the total galactic mass being in the form of molecular hydrogen, and thus shed little light on the ultimate fate of these galaxies.

Key words: galaxies: compact – galaxies: formation – galaxies: ISM – galaxies: starburst – radio lines: galaxies

Send offprint requests to: C. D. Wilson

© European Southern Observatory (ESO) 1998

Online publication: January 8, 1998