Abstract
This paper presents sensitive new observations of the fine-structure line 3P2 → 3P1 (J = 2-1) of the neutral atomic carbon C I (νrest ~ 809 GHz) in the strongly lensed ultraluminous infrared galaxy (ULIRG) IRAS F10214+4724 at z = 2.3 obtained with the millimeter/submillimeter James Clerk Maxwell telescope (JCMT). These do not confirm the presence of emission from this line at the flux levels or angular extent previously reported in the literature. The new 2 σ upper limits are S ≲ 7 Jy km s-1 (central position), and ⟨S⟩ ≲ 8.5 Jy km s-1 (average over the two Δα = 0'', Δδ = ±10'' positions). C I emission assumed to be fully concomitant with the bulk of H2 and confined entirely within the strongly lensed object yields an upper limit of M(H2) ≲ 1.5 × 1010 M☉, compatible with the reported CO-derived H2 gas mass, within the uncertainties of the two methods. A comparison is made with the recent detection of the 3P1 → 3P0 (J = 1-0) line in this galaxy by Weiss et al., and the large discrepancy with the previous C I measurements is briefly discussed.
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