论文标题
在z = 1.5和hizels的正常星系中，非体调查和遮盖的恒星形成活性的KPC规模的解决研究
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
论文作者
论文摘要
我们提出了Atacama大毫米/亚毫米阵列（ALMA）连续观测，该样品是在红移1.47和2.23中选择的9个星形星系，并从高$ Z $排放线调查（Hizels）中选择。 Alma以0.25''的分辨率在REST-FRAME 355 $μ$ m处检测到我们样本中的四个星系。 Together with the previously observed H$α$ emission, from adaptive optics-assisted integral-field-unit spectroscopy (0.15'' resolution), and F606W and F140W imaging from the Hubble Space Telescope (0.2'' resolution), we study the star-formation activity, stellar and dust mass in these high-redshift galaxies at $\sim$kpc-scale resolution.我们发现，对于更大的星系（$ M _*> 10^{10.5} $ M $ _ \ ODOT $）和更高的[N {\ sc II}]/H $α$比率（$> 0.25 $，对气相金属的代理））。灰尘延伸至8 kpc的半径，即使对于那些呈现块状H $α$形态的星系，也具有光滑的结构。为检测到的星系派生的半光线半径（$ r _ {\ rm dust} $）是$ \ sim $ 4.5 kpc的顺序，是类似的红移的两倍以上。我们的全球恒星形成率估计值 - 来自Far-Ir和灭绝校正的H $α$ Luminosities - 非常同意。然而，星际介质不同阶段的不同形态表明高红移正常星系的复杂灭绝特性。
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 $μ$m. Together with the previously observed H$α$ emission, from adaptive optics-assisted integral-field-unit spectroscopy (0.15'' resolution), and F606W and F140W imaging from the Hubble Space Telescope (0.2'' resolution), we study the star-formation activity, stellar and dust mass in these high-redshift galaxies at $\sim$kpc-scale resolution. We find that ALMA detection rates are higher for more massive galaxies ($M_*>10^{10.5}$ M$_\odot$) and higher [N {\sc ii}]/H$α$ 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$α$ morphologies. The half-light radii ($R_{\rm dust}$) derived for the detected galaxies are of the order $\sim$4.5 kpc, more than twice the size of submillimetre-selected galaxies at a similar redshift. Our global star-formation rate estimates -- from far-IR and extinction-corrected H$α$ 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.
