Gas and Dust in the Extremely Red Object ERO J164502+4626.4

Details Gas and Dust in the Extremely Red Object ERO J164502+4626.4 Gas and Dust in the Extremely Red Object ERO J164502+4626.4

2003-09-07

arxiv.org/abs/astro-ph/0309213v1

Astrophys.J.599:839-846,2003

Astronomy and Astrophysics

Astrophysics

21 pages, 2 figures, accepted for publication in ApJ

Scientific paper

10.1086/379547

We report the first detection of the lowest CO transition in a sub-millimetre bright galaxy and extremely red object (ERO) at z = 1.44 using the Very Large Array. The total J = 1 - 0 line luminosity of ERO J164502+4626.4 is (7+-1) x 10^{10} K km s^{-1} pc^2, which yields a total molecular gas mass of ~6 x 10^{10} Msun. We also present a map of the 850-um continuum emission obtained using SCUBA, from which we infer a far-IR luminosity and dust mass of L_FIR ~ 9 x 10^{12} Lsun and M_d ~ 9 x 10^{8} Msun. We find tentative evidence that the CO and sub-mm dust emission is extended over several tens of kpc. If confirmed by high-resolution imaging, this implies that ERO J164502+4626.4 is not simply a high redshift counterpart of a typical Ultra Luminous Infrared Galaxy (ULIRG).

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