Characterization of Two 2 mm detected Optically Obscured Dusty Star-forming Galaxies
Characterization of Two 2 mm detected Optically Obscured Dusty Star-forming Galaxies
复制标题
DOI：
10.3847/1538-4357/ac366a
复制
发表时间：
2021-11
期刊：
影响因子：
--
通讯作者：
S. Manning;C. Casey;J. Zavala;G. Magdis;P. Drew;J. Champagne;M. Aravena;M. Béthermin;D. Clements;S. Finkelstein;S. Fujimoto;C. Hayward;J. Hodge;O. Ilbert;J. Kartaltepe;K. Knudsen;A. Koekemoer;A. Man;D. Sanders;K. Sheth;J. Spilker;J. Staguhn;M. Talia;E. Treister;M. Yun
中科院分区：
文献类型：
--
作者：
S. Manning;C. Casey;J. Zavala;G. Magdis;P. Drew;J. Champagne;M. Aravena;M. Béthermin;D. Clements;S. Finkelstein;S. Fujimoto;C. Hayward;J. Hodge;O. Ilbert;J. Kartaltepe;K. Knudsen;A. Koekemoer;A. Man;D. Sanders;K. Sheth;J. Spilker;J. Staguhn;M. Talia;E. Treister;M. Yun
ALMA (MORA) 2 毫米遮光再电离测绘旨在探测高红移 (z ≳ 4)、大质量、尘埃状的恒星形成星系 (DSFG)。在这里，我们提出了调查中确定的两个可能的高红移源，其物理特性与文献中其他地方发现的一类光学/近红外 (OIR) 不可见 DSFG 一致。我们首先对所有可用的光度数据进行严格分析，以适应光谱能量分布并估计红移，然后根据我们的发现得出物理特性。我们的结果表明，称为 MORA-5 和 MORA-9 的两个星系代表了“OIR-暗”类 DSFG 的两个极端。 MORA-5 ( zphot=4.3−1.3+1.5 ) 是一种明显更活跃的星暴，其恒星形成率 (SFR) 为 830−190+340 M ⊙ yr−1 ，而 MORA-9 ( zphot=4.3−1.0+1.3 ) 的恒星形成率 (SFR) 为 200−60+250 M ⊙ yr−1 。基于这些源的恒星质量 (M ⋆ ≈ 1010−11 M ⊙)、空间密度 (n ∼ (5 ± 2) × 10−6 Mpc−3，其中包含了 MORA 样本中 z = 4.6 和 z = 5.9 处另外两个经光谱证实的 OIR 暗 DSFG）以及这些源的气体耗尽时间尺度 (<1 Gyr)，我们找到了支持这一理论的证据： OIR 暗 DSFG 是最近发现的 3 < z < 4 个大质量静止星系的前身。
The 2 mm Mapping Obscuration to Reionization with ALMA (MORA) Survey was designed to detect high-redshift (z ≳ 4), massive, dusty star-forming galaxies (DSFGs). Here we present two likely high-redshift sources, identified in the survey, whose physical characteristics are consistent with a class of optical/near-infrared (OIR)-invisible DSFGs found elsewhere in the literature. We first perform a rigorous analysis of all available photometric data to fit spectral energy distributions and estimate redshifts before deriving physical properties based on our findings. Our results suggest the two galaxies, called MORA-5 and MORA-9, represent two extremes of the “OIR-dark” class of DSFGs. MORA-5 ( zphot=4.3−1.3+1.5 ) is a significantly more active starburst with a star formation rate (SFR) of 830−190+340 M ⊙ yr−1 compared to MORA-9 ( zphot=4.3−1.0+1.3 ), whose SFR is a modest 200−60+250 M ⊙ yr−1. Based on the stellar masses (M ⋆ ≈ 1010−11 M ⊙), space density (n ∼ (5 ± 2) × 10−6 Mpc−3, which incorporates two other spectroscopically confirmed OIR-dark DSFGs in the MORA sample at z = 4.6 and z = 5.9), and gas depletion timescales (<1 Gyr) of these sources, we find evidence supporting the theory that OIR-dark DSFGs are the progenitors of recently discovered 3 < z < 4 massive quiescent galaxies.