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arXiv 2109.03420astro-ph.GA
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z ~ 0.84范围内棒星系的宇宙演化

Cosmic Evolution of Barred Galaxies up to z ~ 0.84

Taehyun Kim, E. Athanassoula, Kartik Sheth, Albert Bosma, Myeong-Gu Park, Yun Hee Lee, Hong Bae Ann

摘要:

利用COSMOS巡天的F814 W图像,研究了379个棒星系在0.2 < z $\leq$ 0.835时棒星系长度、强度和棒星系周围光亏损的宇宙演化。我们的样本涵盖了恒星质量为10.0 $\leq$ log(M*/Msun)$\leq$ 11.4和各种哈勃类型的星系。棒的长度与星系质量、盘尺度长度(h)、R50和R90密切相关,其中后两个半径分别占恒星总质量的50%和90%。棒的长度几乎保持不变,这表明在过去的7个陀螺棒的长度很少或没有演变。标准化的棒长(Rbar/h,Rbar/R50和Rbar/R90)没有显示出任何清晰的宇宙演化。此外,棒的强度(A2和Qb)和棒周围的光赤字揭示了很少或根本没有宇宙演化。标准化的棒长度在宇宙时间内的恒定性意味着棒和盘的演化在所有时间内都是紧密相连的。我们讨论我们的结果的框架内的预测数值模拟。我们的结论是,我们的结果和最新的模拟之间没有强烈的分歧。

英文摘要:

We explore the cosmic evolution of the bar length, strength, and light deficit around the bar for 379 barred galaxies at 0.2 < z $\leq$ 0.835 using F814W images from the COSMOS survey. Our sample covers galaxies with stellar mass 10.0 $\leq$ log(M*/Msun) $\leq$ 11.4 and various Hubble types. The bar length is strongly related to the galaxy mass, the disk scale length (h), R50, and R90, where the last two are the radii containing 50 and 90% of total stellar mass, respectively. Bar length remains almost constant, suggesting little or no evolution in bar length over the last 7 Gyrs. The normalized bar lengths (Rbar/h, Rbar/R50, and Rbar/R90) do not show any clear cosmic evolution. Also, the bar strength (A2 and Qb) and the light deficit around the bar reveal little or no cosmic evolution. The constancy of the normalized bar lengths over cosmic time implies that the evolution of bars and of disks is strongly linked over all times. We discuss our results in the framework of predictions from numerical simulations. We conclude there is no strong disagreement between our results and up-to-date simulations.

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