Extended Molecular Gas in FSC 10214+4724
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Abstract
We report high resolution imaging of the CO (3-2) emission in the luminous infrared source FSC 10214+4724 at z = 2.2853. Maps at resolutions of 23 × 30 and 45-90 km s-1 show the CO emission peak coinciding with those of Hα and radio continuum. Two components are identified in the CO emission: an unresolved core and an extended source (~19 × 44)—elongated southeast-northwest. The implied size is 9 × 24 kpc for H0 = 75 km s-1 Mpc-1 and q0 = 0.5. The extent of the CO emission is significantly greater than that of either the optical or the radio continuum (~1'') and the CO extent varies between the line core and the wings. If the gravitational lensing is occuring in FSC 10214+4724 (as has been suggested based on the near infrared morphology), the magnification factor for the CO emission is likely to be lower than for the near-infrared and the observed CO extent is probably an upper limit to the true source size.
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