论文标题
安魂曲2D：HST 2D Grism光谱法的空间分辨出恒星种群
REQUIEM-2D: Spatially Resolved Stellar Populations from HST 2D Grism Spectroscopy
论文作者
论文摘要
我们提出了一种新型的贝叶斯方法，以共同模拟高红移星系的光度法和深哈勃太空望远镜（HST）2D Grism光谱。我们的Rembiem2D代码衡量了尚未解决和分辨的恒星种群，年龄和恒星形成历史（SFHS），以实现持续的重新QIUEM（解决静态放大）星系调查，该测量针对Z〜2处的强烈重力镜头的Quiescent Galaxies。我们使用Illustris宇宙学模拟中的Z〜2大型星系样本来测试\ texttt {requiem2d}的准确性，发现我们恢复了SFH和中位数恒星年龄的一般趋势。我们进一步介绍了一项针对Requiem Galaxies调查的试点研究：MRG-S0851，一项典范，大规模（$ \ log m_* / m_* / m_* / m_ \ odot = 11.02 \ pm 0.04 $）$ z = 1.883 \ pm 0.001 $。估计的重力放大倍数为$μ= 5.7^{+0.4} _ { - 0.2} $，我们在0.6 kpc物理尺寸箱上采样了恒星种群。全球大规模加权的中位年龄约为$ 1.8 _ { - 0.2}^{+0.3} $ gyr，我们的空间解决分析表明，MRG-S0851在内部3 kpc的核心中具有统一的统一梯度，并考虑到对年龄和金属对年龄测量的微妙效果，对年龄的测量效果，有利于早期的形式，有利于早期形式的表现。完整的Requiem-2D样本的分析将在即将发表的论文中介绍，并释放Anceem2D代码的Beta-Release。
We present a novel Bayesian methodology to jointly model photometry and deep Hubble Space Telescope (HST) 2d grism spectroscopy of high-redshift galaxies. Our requiem2d code measures both unresolved and resolved stellar populations, ages, and star-formation histories (SFHs) for the ongoing REQIUEM (REsolving QUIEscent Magnified) Galaxies Survey, which targets strong gravitationally lensed quiescent galaxies at z~2. We test the accuracy of \texttt{requiem2d} using a simulated sample of massive galaxies at z~2 from the Illustris cosmological simulation and find we recover the general trends in SFH and median stellar ages. We further present a pilot study for the REQUIEM Galaxies Survey: MRG-S0851, a quintuply-imaged, massive ($\log M_* / M_\odot = 11.02 \pm 0.04$) red galaxy at $z=1.883\pm 0.001$. With an estimated gravitational magnification of $μ= 5.7^{+0.4}_{-0.2}$, we sample the stellar populations on 0.6 kpc physical size bins. The global mass-weighted median age is constrained to be $1.8_{-0.2}^{+0.3}$ Gyr, and our spatially resolved analysis reveals that MRG-S0851 has a flat age gradient in the inner 3 kpc core after taking into account the subtle effects of dust and metallicity on age measurements, favoring an early formation scenario. The analysis for the full REQUIEM-2D sample will be presented in a forthcoming paper with a beta-release of the requiem2d code.
