Effect of Local Environment on Galaxy Quenching and Morphology at z < 1

我们利用Subaru super super - prime- cam （HSC）成像，覆盖100°^2，测量了约150万个星系在z < 1的结构特性。我们使用模拟星系仔细校准了我们的测量结果，以解释各种系统偏差。我们使用模拟星系的测试表明，我们以5%的精度（或更好）获得了i< 24.5等的星系的大小。作为科学论证，PI利用尺寸测量在恒星质量的广泛范围内确定了尺寸-质量关系，并表明这种关系更好地表征为双幂函数：关系在枢轴质量上方斜率更陡。我们从HSC得到的结果与太空观测的结果非常吻合，特别是对低质量星系的观测，这强烈表明我们的尺寸测量是可靠的，而不是由系统偏差驱动的。与之前的深度调查相比，大质量星系的更大样本使我们能够对大多数大质量星系的大小-质量关系得出更严格的约束。这里提出的结果弥补了本地宇宙（z~0）和高红移作品之间的差距。PI已经向《天体物理学杂志》提交了题为“super super - cam Subaru战略调查：z<1处星系大小-质量关系的质量依赖斜率”的出版物。手稿已被接受出版。我们还将我们的目录提供给HSC协作。

We utilised the Subaru Hyper Suprime-Cam (HSC) imaging, covering 100 deg^2, to measure structural properties of ~1.5 million galaxies at z < 1. We carefully calibrated our measurements using simulated galaxies to account for various systematic biases. Our test using the simulated galaxies showed that we obtain sizes for galaxies with i< 24.5 mag with 5% accuracy (or better).As a demonstration of science, PI has utilised the size measurements to robustly determine the size-mass relation over the broad range in stellar mass and show that the relations for are better characterised a double-power function: the relation is steeper slope above the pivot mass. Our result from the HSC are in excellent agreements with those from the spaced-based observations, particularly for low-mass galaxies, strongly suggesting that our size measurements are robust and not driven by a systematic bias.The larger sample of massive galaxies than the previous deep surveys enable us to derive the tighter constraint on the size-mass relation for most massive galaxies. The results presented here bridge the gap between the local Universe (z~0) and the high redshift works. PI has submitted the publication with the title “Hyper Suprime-Cam Subaru Strategic Survey: A Mass-Dependent Slope of the Galaxy Size-Mass Relation at z<1” to The Astrophysical Journal. The manuscript has been accepted for publication. We have also made our catalog available to HSC Collaboration.