论文标题
阿尔玛（Alma
ALMA Confirmation of an Obscured Hyperluminous Radio-Loud AGN at $z=6.853$ Associated with a Dusty Starburst in the 1.5 deg$^2$ COSMOS Field
论文作者
论文摘要
我们提出了6个频段6的ALMA观察，对广播电台的观察结果（$ l_ {1.4 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ {ghz}} = 10^{25.4} $ w hz $^{ - 1} $）agn候选$ z_____________________ \ mthrm {phot} = 6.83 = 6.83 \ pm0.0.0.0.0.5 deg pm0.0.5 deg in 1.5 deg。 The ALMA data reveal detections of exceptionally strong [CII]158$μ$m ($z_\mathrm{[CII]}=6.8532$) and underlying dust continuum emission from this object (COS-87259), where the [CII] line luminosity, line width, and 158$μ$m continuum luminosity are comparable to that seen from $z\sim7$亚MM星系和类星体宿主。 158 $ $ M C的连续性检测表明，总红外发光度为$ 9 \ times10^{12} $ $ $ $ $ l_ \ odot $，具有相应的非常大的晦涩的星形形成率（1300 $ m_ \ odot $/yr）和尘埃质量（$ 2 \ times10^9 $ $ m_ \ odot $）。 VIRCAM和IRAC光度法之间看到的强烈突破也许表明COS-87259是一个极为巨大的电离时代星系，带有$ M_ \ ast \ ast \ aid1.7 \ times10^{11} $ $ m_ \ odot $。此外，MIPS，PAC和SPIRE的检测表明，该对象具有大量遮盖的AGN（$τ_{_ {\ Mathrm {\ Mathrm {9.7μm}}} = 2.3 $），其侧付观量的光度为大约$ 5 \ \ \ \ \ \ \ \ \ l_ $ $ $ $ $ odod。如此高的AGN亮度表明，如果在Eddington限制附近积聚，则该物体由$ \ $ \ $ \ $ 1.6 $ \ times $ 10 $^9 $ $^9 $ $ m_ \ odot $ black Hole，并且实际上是极其紫外线的luminous的高度镜头版本（$ m_ {1450} \ of-m_ {1450}。值得注意的是，这些$ z \ sim7 $ quasars是一个极为罕见的人口（$ \ sim $ 0.001 v $^{ - 2} $），而在相对较小的字段上则确定了COS-87259。未来的非常广阔的区域调查，例如，罗马和欧几里得有可能识别类似于COS-87259的对象，识别出更红色但紫外线的$ z \ gtrsim7 $对象，从而使该人群中强烈的晦涩之星形成和超级大型黑洞的生长提供了更丰富的见解。
We present band 6 ALMA observations of a heavily-obscured radio-loud ($L_{1.4\ \mathrm{GHz}}=10^{25.4}$ W Hz$^{-1}$) AGN candidate at $z_\mathrm{phot}=6.83\pm0.06$ found in the 1.5 deg$^2$ COSMOS field. The ALMA data reveal detections of exceptionally strong [CII]158$μ$m ($z_\mathrm{[CII]}=6.8532$) and underlying dust continuum emission from this object (COS-87259), where the [CII] line luminosity, line width, and 158$μ$m continuum luminosity are comparable to that seen from $z\sim7$ sub-mm galaxies and quasar hosts. The 158$μ$m continuum detection suggests a total infrared luminosity of $9\times10^{12}$ $L_\odot$ with corresponding very large obscured star formation rate (1300 $M_\odot$/yr) and dust mass ($2\times10^9$ $M_\odot$). The strong break seen between the VIRCam and IRAC photometry perhaps suggests that COS-87259 is an extremely massive reionization era galaxy with $M_\ast\approx1.7\times10^{11}$ $M_\odot$. Moreover, the MIPS, PACS, and SPIRE detections imply that this object harbors an AGN that is heavily obscured ($τ_{_{\mathrm{9.7μm}}}=2.3$) with a bolometric luminosity of approximately $5\times10^{13}$ $L_\odot$. Such a very high AGN luminosity suggests this object is powered by an $\approx$1.6 $\times$ 10$^9$ $M_\odot$ black hole if accreting near the Eddington limit, and is effectively a highly-obscured version of an extremely UV-luminous ($M_{1450}\approx-27.3$) $z\sim7$ quasar. Notably, these $z\sim7$ quasars are an exceedingly rare population ($\sim$0.001 deg$^{-2}$) while COS-87259 was identified over a relatively small field. Future very wide-area surveys with, e.g., Roman and Euclid have the potential to identify many more extremely red yet UV-bright $z\gtrsim7$ objects similar to COS-87259, providing richer insight into the occurrence of intense obscured star formation and supermassive black hole growth among this population.
