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ALMA [N ii] 205 μm Imaging Spectroscopy of the Lensed Submillimeter Galaxy ID 141 at Redshift 4.24.
- Source :
- Astrophysical Journal; 7/20/2020, Vol. 898 Issue 1, p1-9, 9p
- Publication Year :
- 2020
-
Abstract
- 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<superscript>−1</superscript> 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<superscript>−1</superscript>) 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<superscript>−1</superscript> and provide an independent estimate of the size of the star-forming region kpc in radius. [ABSTRACT FROM AUTHOR]
- Subjects :
- SPECTRAL imaging
DISK galaxies
GALAXIES
DARK matter
STAR formation
Subjects
Details
- Language :
- English
- ISSN :
- 0004637X
- Volume :
- 898
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Astrophysical Journal
- Publication Type :
- Academic Journal
- Accession number :
- 145143342
- Full Text :
- https://doi.org/10.3847/1538-4357/ab980b