论文标题
Subaru HSC（Wergs）对射电星系的广泛探索。 iii。通过Lyman Break Technique的发现Z = 4.72射线星系
Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). III. Discovery of a z = 4.72 Radio Galaxy with Lyman Break Technique
论文作者
论文摘要
我们报告了$ z = 4.72 $宽的银河系，HSC J083913.17+011308.1，通过使用Hyper Soprime-CAM Subaru战略调查（HSC-SSP）目录中的VLA First Radio Sources使用Lyman Break Technique。 $ z> 3 $的已知高$ z $射电星系（HZRGS）的数量很少，可以限制迄今为止HZRGS的演变。 HSC-SSP进行的深层和广阔的光学调查使我们能够将Lyman Break技术应用于对HZRGS的大量搜索。对于通过无线电检测预选的$ r $ band辍学的HZRG候选者，已经执行了使用GMOS/GEMINI的后续光谱。获得的频谱显示了一条清晰的$α$排放线，将其红移至$ z = 4.72 $。用剩下的紫外线和光学光泽的SED拟合分析表明，使用$ \ log {m _*/m _*/m _ {\ odot}} = 11.4 $的hzrg的巨大性质。 Ly $α$的小宽度和中等红色的紫外线表示其尘土飞扬的宿主星系，这意味着化学演化和尘土飞扬的系统。 The radio spectral index does not meet a criterion for an ultra-steep spectrum: $α^{325}_{1400}$ of $-1.1$ and $α^{150}_{1400}$ of $-0.9$, demonstrating that the HSC-SSP survey compensates for a sub-population of HzRGs which are missed in surveys focusing on an ultra-steep spectral 指数。
We report a discovery of $z = 4.72$ radio galaxy, HSC J083913.17+011308.1, by using the Lyman break technique with the Hyper Suprime-Cam Subaru Strategic Survey (HSC-SSP) catalog for VLA FIRST radio sources. The number of known high-$z$ radio galaxies (HzRGs) at $z > 3$ is quite small to constrain the evolution of HzRGs so far. The deep and wide-area optical survey by HSC-SSP enables us to apply the Lyman break technique to a large search for HzRGs. For an HzRG candidate among pre-selected $r$-band dropouts with a radio detection, a follow-up optical spectroscopy with GMOS/Gemini has been performed. The obtained spectrum presents a clear Ly$α$ emission line redshifted to $z=4.72$. The SED fitting analysis with the rest-frame UV and optical photometries suggests the massive nature of this HzRG with $\log{M_*/M_{\odot}} = 11.4$. The small equivalent width of Ly$α$ and the moderately red UV colors indicate its dusty host galaxy, implying a chemically evolved and dusty system. The radio spectral index does not meet a criterion for an ultra-steep spectrum: $α^{325}_{1400}$ of $-1.1$ and $α^{150}_{1400}$ of $-0.9$, demonstrating that the HSC-SSP survey compensates for a sub-population of HzRGs which are missed in surveys focusing on an ultra-steep spectral index.
