Evolution of Galaxies and their Environments at z = 0.1 to 3 in COSMOS
N. Scoville, S. Arnouts, H. Aussel, A. Benson, A. Bongiorno, K. Bundy, M. A. A. Calvo, P. Capak, M. Carollo, F. Civano, J. Dunlop, M. Elvis, A. Faisst, A. Finog… 展开作者
N. Scoville, S. Arnouts, H. Aussel, A. Benson, A. Bongiorno, K. Bundy, M. A. A. Calvo, P. Capak, M. Carollo, F. Civano, J. Dunlop, M. Elvis, A. Faisst, A. Finoguenov, Hai Fu, M. Giavalisco, Q. Guo, O. Ilbert, A. Iovino, M. Kajisawa, J. Kartaltepe, A. Leauthaud, O. Le Fe`vre, E. LeFloch, S. J. Lilly, C. T-C. Liu, S. Manohar, R. Massey, D. Masters, H. J. McCracken, B. Mobasher, Y-J. Peng, A. Renzini, J. Rhodes, M. Salvato, D. B. Sanders, B. D. Sarvestani, C. Scarlata, E. Schinnerer, K. Sheth, P. L. Shopbell, V. Smol'cic, Y. Taniguchi, J. E. Taylor, S. D. M. White, L. Yan
Large-scale structures (LSS) out to z $< 3.0$ are measured in the Cosmic Evolution Survey (COSMOS) using extremely accurate photometric redshifts (photoz). The Ks-band selected sample (from Ultra-Vista) is comprised of 155,954 galaxies. Two techniques -- adaptive smoothing and Voronoi tessellation -- are used to estimate the environmental densities within 127 redshift slices. Approximately 250 statistically significant overdense structures are identified out to z $= 3.0$ with shapes varying from elongated filamentary structures to more circularly symmetric concentrations. We also compare the densities derived for COSMOS with those based on semi-analytic predictions for a $Λ$CDM simulation and find excellent overall agreement between the mean densities as a function of redshift and the range of densities. The galaxy properties (stellar mass, spectral energy distributions (SEDs) and star formation rates (SFRs)) are strongly correlated with environmental density and redshift, particularly at z $< 1.0 - 1.2$. Classifying the spectral type of each galaxy using the rest-frame b-i color (from the photoz SED fitting), we find a strong correlation of early type galaxies (E-Sa) with high density environments, while the degree of environmental segregation varies systematically with redshift out to z $\sim 1.3$. In the highest density regions, 80% of the galaxies are early types at z=0.2 compared to only 20% at z = 1.5. The SFRs and the star formation timescales exhibit clear environmental correlations. At z $> 0.8$, the star formation rate density (SFRD) is uniformly distributed over all environmental density percentiles, while at lower redshifts the dominant contribution is shifted to galaxies in lower density environments.
Quiescent Compact Galaxies at Intermediate Redshift in the COSMOS Field II. The Fundamental Plane of Massive Galaxies
我们研究了宇宙场中中等红移静止星系的表面亮度、速度色散和基本面$-$大小之间的关系。COSMOS样本由平均速度色散为$σ\sim 250$ km s $^{-1}$的$\sim150$大质量静止星系组成，红移在$0.2<z<0.8$之间。样本中超过一半的星系是紧凑的。COSMOS星系的表面亮度、速度色散和大小之间存在紧密的关系（$\sim0.1$ dex散射）。在速度色散和大小的固定组合下，COSMOS星系比本地宇宙中的星系更亮。这些表面亮度偏移与静止坐标系的$g-z$颜色和$D_n4000$指数相关;蓝色星系和那些具有较小$D_n4000$指数的星系具有较大的偏移。星族合成模型表明，大质量的宇宙星系比本地宇宙中同样大质量的静止星系更年轻，因此更明亮。被动演化单独带来了巨大的紧凑的静止宇宙星系的本地基本平面在$z = 0$。因此，大质量致密静止星系自$z\sim1$以来的尺寸或速度色散演化受到在基本面观测到的小散射的限制。我们的结论是，在$z\lesssim1$的大规模紧凑的静止星系是不是一个特殊的一类对象，而是正常的静止星系人口的质量和大小分布的尾巴。
Luminosity Distribution of Gamma-Ray Burst Host Galaxies at redshift z=1 in Cosmological Smoothed Particle Hydrodynamic Simulations: Implications for the Metallicity Dependence of GRBs
Cosmological observational tests in the JWST Era. I: angular size - redshift
Saint Petersburg Branch of the Special Astrophysical Observatory of RAS（俄罗斯科学院特别天体物理观测站圣彼得堡分部）；Main Astronomical Observatory of RAS（俄罗斯科学院主天文台）；Institute of Astronomy of RAS（俄罗斯科学院天文研究所）；Special Astrophysical Observatory of RAS（俄罗斯科学院特别天体物理观测站）；Saint Petersburg State University（圣彼得堡国立大学）；Saint Petersburg State Marine Technical University（圣彼得堡国立海事技术大学）
Synergy between CSST and third-generation gravitational-wave detectors: Inferring cosmological parameters using cross-correlation of dark sirens and galaxies
Northeastern University（东北大学）；University of Western Australia（西澳大学）；The University of Tokyo（东京大学）；Hainan University（海南大学）
