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Title:
CO at z=2.3 in IRAS 10214+4724
Authors:
Radford, S. J. E.; Solomon, P. M.; Downes, D.
Affiliation:
AA(NRAO), AB(SUNY Stony Brook), AC(IRAM)
Publication:
American Astronomical Society, 185th AAS Meeting, #18.04; Bulletin of the American Astronomical Society, Vol. 26, p.1337
Publication Date:
12/1994
Origin:
AAS
Bibliographic Code:
1994AAS...185.1804R

Abstract

New observations of CO in IRAS 10214+4724 confirm the presence of large amounts of warm, dense molecular gas in a small source. A new CO32 spectrum from the 12m telescope shows a 250kms wide line centered at z = 2.2855. The line flux, 6+/- 1.5Jy kms, agrees with measurements at other telescopes (IRAM 30m and NRO 45m). This indicates the source must be small and dispels previous suggestions of missing flux or undetected components. A new CO32 map from the IRAM interferometer with 2'' resolution shows the source size is < 2'' and there is little, if any, evidence for a velocity gradient. In particular, the new map does not confirm the source extension indicated by an earlier, lower quality map. A map of CO65 from the OVRO interferometer with 2.5'' resolution confirms the line flux measured with the IRAM 30m telescope and, hence, the high excitation of the molecular gas. This map also shows litte evidence for source extension or a velocity gradient. The CO data imply 10214+4724 contains 10(11}h({-2)) Msun of Htwo at 5000 per cc and 50K. The source size limit corresponds to < 8 h(-1) kpc, a typical galactic scale. Combined with the line width, this indicates the total mass is < 1.3 times 10(11) (sin i)(2) h(-1) Msun. Thus either a very large fraction of the galaxy's mass is molecular gas or the inclination is low. The NRAO is operated by Associated Universities, Inc., under cooperative agreement with the National Science Foundation.
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