Artículo de revista
A kpc-scale resolved study of unobscured and obscured star-formation activity in normal galaxies at z = 1.5 and 2.2 from ALMA and HiZELS
Fecha
2020Registro en:
MNRAS 000, 1–14 (2020)
10.1093/mnras/staa3036
Autor
Cheng, Cheng
Ibar, Edo
Smail, Ian
Molina, Juan C.
Sobral, David
Escala Astorquiza, Andrés
Best, Philip
Cochrane, Rachel
Gillman, Steven
Swinbank, Mark
Ivison, R. J.
Huang, Jia Sheng
Hughes, Thomas M.
Villard, Eric
Cirasuolo, Michele
Institución
Resumen
We present Atacama Large Millimeter/Submillimeter Array (ALMA) continuum observations of a sample of nine star-forming galaxies at redshifts 1.47 and 2.23 selected from the High-z Emission Line Survey (HiZELS). Four galaxies in our sample are detected at high significance by ALMA at a resolution of 0 ''.25 at rest-frame 355 mu m. Together with the previously observed H alpha emission, from adaptive optics-assisted integral-field-unit spectroscopy (similar to 0 ''.15 resolution), and F606W and F140W imaging from the Hubble Space Telescope (similar to 0 ''.2 resolution), we study the star formation activity, stellar and dust mass in these high-redshift galaxies at similar to kpc-scale resolution. We find that ALMA detection rates are higher for more massive galaxies (M-* > 10(10.5) M-circle dot) and higher [N II]/H alpha ratios (>0.25, a proxy for gas-phase metallicity). The dust extends out to a radius of 8 kpc, with a smooth structure, even for those galaxies presenting clumpy H alpha morphologies. The half-light radii (R-dust) derived for the detected galaxies are of the order similar to 4.5 kpc, more than twice the size of submillimetre-selected galaxies at a similar redshift. Our global star formation rate estimates - from far-infrared and extinction-corrected H alpha luminosities - are in good agreement. However, the different morphologies of the different phases of the interstellar medium suggest complex extinction properties of the high-redshift normal galaxies.
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