南方基地知识库

We present an Atacama Large Millimeter/submillimeter Array observation of the Submillimeter galaxy ID 141 at z?=?4.24 in the [N ii] 205 μm line (hereafter [N ii] ) and the underlying continuum at (rest-frame) 197.6 μm. Benefiting from lensing magnification by a galaxy pair at z?=?0.595, ID 141 is one of the brightest SMGs. At the angular resolutions of –1.″5 (1″ ～6.9 kpc), our observation clearly separates and moderately resolves the two lensed images in both continuum and line emission at a signal-to-noise ratio >5. Our continuum-based lensing model implies an averaged amplification factor of ～5.8 and reveals that the delensed continuum image has a Sérsic index and Sérsic radius of ～0.″18 (～1.24 kpc). Furthermore, the reconstructed [N ii] velocity field in the source plane is dominated by a rotation component with a maximum velocity of ～300 km s?1 at large radii, indicating a dark matter halo mass of ～10 . This, together with the reconstructed velocity dispersion field being smooth and modest in value (<100 km s?1) over much of the outer parts of the galaxy, favors the interpretation of ID 141 being a disk galaxy dynamically supported by rotation. The observed [N ii] /CO (7?6) and [N ii] /[C ii] 158 μm line-luminosity ratios, which are consistent with the corresponding line ratio versus far-infrared color correlation from local luminous infrared galaxies, imply a delensed star formation rate of (1.8 yr?1 and provide an independent estimate of the size of the star-forming region kpc in radius.