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ALMA Observations of Quasar Host Galaxies at z ≃ 4.8
The Astrophysical Journal ( IF 4.8 ) Pub Date : 2020-05-27 , DOI: 10.3847/1538-4357/ab8bd3
Nathen H. Nguyen 1 , Paulina Lira 1 , Benny Trakhtenbrot 2 , Hagai Netzer 2 , Claudia Cicone 3, 4 , Roberto Maiolino 5, 6 , Ohad Shemmer 7
Affiliation  

We present ALMA band-7 data of the [CII] $\lambda157.74\,\mu{\rm m}$ emission line and underlying far-infrared (FIR) continuum for twelve luminous quasars at $z \simeq 4.8$, powered by fast-growing supermassive black holes (SMBHs). Our total sample consists of eighteen quasars, twelve of which are presented here for the first time. The new sources consists of six Herschel/SPIRE detected systems, which we define as "FIR-bright" sources, and six Herschel/SPIRE undetected systems, which we define as "FIR-faint" sources. We determine dust masses for the quasars hosts of $M_{dust} \le 0.2-25.0\times 10^8 M_{\odot}$, implying ISM gas masses comparable to the dynamical masses derived from the [CII] kinematics. It is found that on average the MgII line is blueshifted by $\sim 500\,{\rm km\,s}^{-1}$ with respect to the [CII] emission line, which is also observed when complementing our observations with data from the literature. We find that all of our "FIR-bright" subsample and most of the "FIR-faint" objects lie above the main sequence of star forming galaxies at $z \sim 5$. We detect companion sub-millimeter galaxies (SMGs) for two sources, both FIR-faint, with a range of projected distances of $\sim20-60$ kpc and with typical velocity shifts of $\left|\Delta v\right| \lesssim200\,{\rm km\,s}^{-1}$ from the quasar hosts. Of our total sample of eighteen quasars, 5/18 are found to have dust obscured starforming companions.

中文翻译:

ALMA 在 z ≃ 4.8 处对类星体宿主星系的观测

我们在 $z \simeq 4.8$ 处展示了 12 个发光类星体的 [CII] $\lambda157.74\,\mu{\rm m}$ 发射线和潜在远红外 (FIR) 连续谱的 ALMA 波段 7 数据,由快速增长的超大质量黑洞 (SMBH) 提供动力。我们的总样本由 18 个类星体组成,其中 12 个是首次出现在这里。新源包括六个 Herschel/SPIRE 检测系统,我们将其定义为“FIR 亮”源,以及六个 Herschel/SPIRE 未检测系统,我们将其定义为“FIR 微弱”源。我们确定了 $M_{dust} \le 0.2-25.0\times 10^8 M_{\odot}$ 类星体宿主的尘埃质量,这意味着 ISM 气体质量与从 [CII] 运动学得出的动力学质量相当。发现平均 MgII 线蓝移了 $\sim 500\,{\rm km\, s}^{-1}$ 相对于 [CII] 发射线,在用文献数据补充我们的观察时也观察到了这一点。我们发现我们所有的“FIR-bright”子样本和大多数“FIR-faint”天体都位于 $z \sim 5$ 处的恒星形成星系的主序列之上。我们检测到两个源的伴亚毫米星系 (SMG),都是 FIR 微弱的,投影距离范围为 $\sim20-60 $ kpc,典型的速度偏移为 $\left|\Delta v\right| \lesssim200\,{\rm km\,s}^{-1}$ 来自类星体主机。在我们 18 个类星体的总样本中,5/18 被发现有尘埃遮挡了恒星形成的伴星。物体位于 $z \sim 5$ 处的恒星形成星系的主序之上。我们检测到两个源的伴亚毫米星系 (SMG),都是 FIR 微弱的,投影距离范围为 $\sim20-60 $ kpc,典型的速度偏移为 $\left|\Delta v\right| \lesssim200\,{\rm km\,s}^{-1}$ 来自类星体主机。在我们 18 个类星体的总样本中,5/18 被发现有尘埃遮挡了恒星形成的伴星。物体位于 $z \sim 5$ 处的恒星形成星系的主序之上。我们检测到两个源的伴亚毫米星系 (SMG),都是 FIR 微弱的,投影距离范围为 $\sim20-60 $ kpc,典型的速度偏移为 $\left|\Delta v\right| \lesssim200\,{\rm km\,s}^{-1}$ 来自类星体主机。在我们 18 个类星体的总样本中,发现 5/18 有尘埃掩盖了恒星形成的伴星。
更新日期:2020-05-27
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