论文标题
哈勃边境领域中星系的恒星质量图：环境淬火中质量依赖性的证据
Resolved Stellar Mass Maps of Galaxies in the Hubble Frontier Fields: Evidence for Mass Dependency in Environmental Quenching
论文作者
论文摘要
了解星系的淬火过程的挑战之一是将祖细胞形成的人群与宇宙时间内的后代静止种群联系起来。在这里，我们通过假设星系的基本恒星质量分布在环境淬火过程中没有显着改变，而这种挑战的新方法是一种新的质量分布，而这些过程并没有显着改变，这些过程仅影响群集星系的气体含量，例如绞车和ram压力剥离。使用哈勃前沿场的深，高分辨率的光度法，我们为群集和田间星系创建了分辨的恒星质量图，我们从中确定了2DSérsic曲线，并获得Sérsic指数和半质量半径。 We classify the quiescent cluster galaxies into disk-like and bulge-like populations based on their Sérsic indices, and find that bulge-like quiescent galaxies dominate the quiescent population at higher masses ($M_\star > 10^{9.5}M_\odot$), whereas disk-like quiescent galaxies dominate at lower masses （$ 10^{8.5} m_ \ odot <m_ \ star <10^{9.5} m_ \ odot $）。使用Sérsic指数和半质量半径，我们确定了群集中静态星系的群体，这些星系是田间恒星形成星系的“形态类似物”。这些类似物被解释为被环境淬火的星系星系。我们使用这些形态类似物来计算环境淬火效率，并且发现效率随着恒星质量的增加而降低。这表明环境淬火对较少的星系更有效，并且环境对淬火星系的影响与质量对淬火星系的影响并不能完全分开。
One of the challenges in understanding the quenching processes for galaxies is connecting progenitor star-forming populations to their descendant quiescent populations over cosmic time. Here we attempt a novel approach to this challenge by assuming that the underlying stellar mass distribution of galaxies is not significantly altered during environmental quenching processes that solely affect the gas content of cluster galaxies, such as strangulation and ram-pressure stripping. Using the deep, high-resolution photometry of the Hubble Frontier Fields, we create resolved stellar mass maps for both cluster and field galaxies, from which we determine 2D Sérsic profiles, and obtain Sérsic indices and half-mass radii. We classify the quiescent cluster galaxies into disk-like and bulge-like populations based on their Sérsic indices, and find that bulge-like quiescent galaxies dominate the quiescent population at higher masses ($M_\star > 10^{9.5}M_\odot$), whereas disk-like quiescent galaxies dominate at lower masses ($10^{8.5}M_\odot< M_\star < 10^{9.5}M_\odot$). Using both the Sérsic indices and half-mass radii, we identify a population of quiescent galaxies in clusters that are "morphological analogues" of field star-forming galaxies. These analogues are interpreted to be star-forming galaxies that had been environmentally quenched. We use these morphological analogues to compute the environmental-quenching efficiency, and we find that the efficiency decreases with increasing stellar mass. This demonstrates that environmental quenching is more effective on less massive galaxies and that the effect of environment on quenching galaxies is not completely separable from the effect of mass on quenching galaxies.
