Search for CO emission in globular clusters.

Details Search for CO emission in globular clusters. Search for CO emission in globular clusters.

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...309..123l&link_type=abstract

Astronomy and Astrophysics, v.309, p.123-128

Astronomy and Astrophysics

Astrophysics

4

Globular Clusters: General, Galaxy: Halo, Radio Lines: Ism

Scientific paper

We have searched for ^12^CO(1->0) and ^12^CO(2->1) emission towards six globular clusters with the IRAM 30-m telescope. At a very low noise level (rms between 3 and 12mK) we found no evidence of CO signals. Our derived 3σ upper limits are below the solar mass for the molecular content of these objects, down to 0.07Msun_ for NGC 5272. Since mass loss from AGB stars and post-turnoff stars should provide up to 100Msun_ of intracluster gas between two disk crossings, we conclude that the gas must have been removed through ram-pressure stripping in a hot gaseous halo, as suggested by recent [OIII] and X-ray observations. For some clusters however, the present hot gas density in the halo is not sufficient for efficient ram-pressure stripping.

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