ALMA [N ii] 205 m Imaging Spectroscopy of the Lensed Submillimeter Galaxy ID 141 at Redshift 4.24
We present an Atacama Large Millimeter/submillimeter Array observation of the Submillimeter galaxy ID 141 at z = 4.24 in the [N ii] 205 m line (hereafter [N ii] ) and the underlying continuum at (rest-frame) 197.6 m. Benefiting from lensing magnification by a galaxy pair at z = 0.595, ID 141 is one...
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Published in | The Astrophysical journal Vol. 898; no. 1 |
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Main Authors | , , , , , , , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
The American Astronomical Society
20.07.2020
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Subjects | |
Online Access | Get full text |
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Summary: | We present an Atacama Large Millimeter/submillimeter Array observation of the Submillimeter galaxy ID 141 at z = 4.24 in the [N ii] 205 m line (hereafter [N ii] ) and the underlying continuum at (rest-frame) 197.6 m. 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 m 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. |
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Bibliography: | AAS19838 Galaxies and Cosmology |
ISSN: | 0004-637X 1538-4357 |
DOI: | 10.3847/1538-4357/ab980b |