论文标题
〜600 pc的强度镜头，巨大的主序列Galaxy J0901：bary式主导的，厚厚的湍流旋转磁盘，Z = 2.259
A ~600 pc view of the strongly-lensed, massive main sequence galaxy J0901: a baryon-dominated, thick turbulent rotating disk with a clumpy cold gas ring at z = 2.259
论文作者
论文摘要
We present a high-resolution kinematic study of the massive main-sequence star-forming galaxy (SFG) SDSS J090122.37+181432.3 (J0901) at z=2.259, using 0.36 arcsec ALMA CO(3-2) and 0.1-0.5 arcsec SINFONI/VLT H-alpha observations. J0901是一种罕见的，强烈的镜头但否则正常的大规模（log（m_star/m_sun）〜11）主序列SFG，为在镜头显微镜下研究了典型的大型SFG，提供了独特的机会。通过融合透镜挠度的正向动力学建模，我们将图像平面中的CO和H-Alpha运动学拟合到约600pc沿运动量主要轴的物理分辨率的大约一个磁盘有效半径（R_E〜4 kpc）。我们的结果表明，冷分子和温暖的离子气体（Sig0_mol〜40 km/s和sig0_ion〜66 km/s）的固有分散体很高，它们保持不变至r_e； r_e中的中等低暗物质分数（f_dm（r_e）〜0.3-0.4）;以及一个中央峰的Q-参数 - 与先前建立的SIG0相对于Z，F_DM与SIG_BARYON和Q的径向趋势非常吻合。我们的数据进一步揭示了〜1-2 kpc内的高恒星质量浓度，而分子气则很少，并且在r〜2-4 kpc处的块状分子气环状结构与内外的淬火方案一致。我们的进一步分析表明，在观察到的宇宙时间之前，J0901仅组装了一半的恒星质量，只有〜400 myrs，而冷气环和密集的中央恒星组件与最近在最近的模拟中发现的高度湍流磁盘的近期潮湿压实事件的路标保持一致。
We present a high-resolution kinematic study of the massive main-sequence star-forming galaxy (SFG) SDSS J090122.37+181432.3 (J0901) at z=2.259, using 0.36 arcsec ALMA CO(3-2) and 0.1-0.5 arcsec SINFONI/VLT H-alpha observations. J0901 is a rare, strongly-lensed but otherwise normal massive (log(M_star/M_sun)~11) main sequence SFG, offering a unique opportunity to study a typical massive SFG under the microscope of lensing. Through forward dynamical modeling incorporating lensing deflection, we fit the CO and H-alpha kinematics in the image plane out to about one disk effective radius (R_e ~ 4 kpc) at a ~600pc delensed physical resolution along the kinematic major axis. Our results show high intrinsic dispersions of the cold molecular and warm ionized gas (sig0_mol ~ 40 km/s and sig0_ion ~ 66 km/s) that remain constant out to R_e; a moderately low dark matter fraction (f_DM(R_e) ~ 0.3-0.4) within R_e; and a centrally-peaked Toomre Q-parameter -- agreeing well with the previously established sig0 vs. z, f_DM vs. Sig_baryon, and Q's radial trends using large-sample non-lensed main sequence SFGs. Our data further reveal a high stellar mass concentration within ~1-2 kpc with little molecular gas, and a clumpy molecular gas ring-like structure at R ~ 2-4 kpc, in line with the inside-out quenching scenario. Our further analysis indicates that J0901 had assembled half of its stellar mass only ~400 Myrs before its observed cosmic time, and cold gas ring and dense central stellar component are consistent with signposts of a recent wet compaction event of a highly turbulent disk found in recent simulations.
