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tex2html_wrap_inline391CO J = 1tex2html_wrap_inline3930 observations of the Circinus galaxy using the Mopra 22-m radio-telescope

M. Elmouttietex2html_wrap_inline395
R.F. Haynestex2html_wrap_inline397
K.L. Jonestex2html_wrap_inline395

tex2html_wrap_inline395 The Physics Dept., The University of Queensland, QLD 4072, Australia
tex2html_wrap_inline397 The Australia Telescope National Facility, CSIRO, P.O. Box 76, Epping, NSW 2121, Australia


The J = 1-0 rotational transition of carbon monoxide has been used to trace the molecular gas at 5 different positions in the Circinus galaxy using the Australia Telescope National Facility's 22-m radio-telescope at Mopra. The intensity profile of the central CO emission has a full width at half maximum of 550 pc. The tex2html_wrap_inline391CO (1-0) spectrum at the centre of the galaxy has an integrated temperature of 145 K kmstex2html_wrap_inline407 , with components peaking at 0.62 K and ranging in velocity from 200 - 600 kmstex2html_wrap_inline407 . The total mass of molecular gas in the Circinus galaxy, assuming the CO intensity profile of the galaxy is similar to the radio continuum, is at least 7.5 tex2html_wrap_inline411 4.1 tex2html_wrap_inline413 10tex2html_wrap_inline415 Mtex2html_wrap_inline417. This estimate, combined with previously published far infra-red data, yields a value for the star forming efficiency, SFE = 16 tex2html_wrap_inline411 9 Ltex2html_wrap_inline417Mtex2html_wrap_inline417tex2html_wrap_inline407 .

keywords: galaxies: Circinus - active nuclei, spiral, Seyfert

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