Radial and Local Density Dependence of Star Formation Properties in Galaxy Clusters from the Hyper Suprime-Cam Survey

IF 4.8 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Hung-Yu Jian, Lihwai Lin, Bau-Ching Hsieh, Keiichi Umetsu, Carlos Lopez-Coba, Masamune Oguri, Connor Bottrell, Yoshiki Toba, Yusei Koyama, Yu-Yen Chang, Tadayuki Kodama, Yutaka Komiyama, Surhud More, Kai-Yang Lin, Atsushi J. Nishizawa, Ichi Tanaka
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Abstract

Abstract This study examines the impact of cluster environments on galaxy properties using data from the Hyper Suprime-Cam Subaru Strategic Program and an optically selected CAMIRA cluster sample. Specifically, the study analyzes the fractions of quiescent and green valley galaxies with stellar masses above 10 8.6 M ⊙ at z ∼ 0.2 and 10 9.8 M ⊙ at z ∼ 1.1, investigating their trends in radius and density. The results indicate that a slow quenching mechanism is at work, as evidenced by a radially independent specific star formation rate reduction of 0.1 dex for star-forming galaxies in a cluster environment. The study also finds that slow quenching dominates fast quenching only for low-mass galaxies (<10 9.2 M ⊙ ) near the cluster edge, based on their contributions to the quiescent fraction. After controlling for M * , z , and local overdensity, the study still finds a significant radial gradient in the quiescent fraction, indicating active ram pressure stripping in dense environments. That said, analyzing the density trend of the quiescent fraction with other fixed parameters suggests that radial and density-related quenching processes are equally crucial for low-mass cluster galaxies. The study concludes that ram pressure stripping is the primary environmental quenching mechanism for high stellar mass galaxies in clusters. By contrast, ram pressure stripping and density-related quenching processes act comparably for low-mass cluster galaxies around the center. Near the cluster boundary, starvation and harassment become the leading quenching processes for low stellar mass galaxies.
星系团中恒星形成特性的径向和局部密度依赖关系
摘要:本研究利用来自super prime- cam Subaru战略计划的数据和光学选择的CAMIRA星团样本,研究了星团环境对星系特性的影响。具体来说,该研究分析了恒星质量在z ~ 0.2和z ~ 1.1高于108.6 M⊙和109.8 M⊙的静止星系和绿谷星系的部分,研究了它们的半径和密度趋势。结果表明,一个缓慢的猝灭机制在起作用,正如星团环境中恒星形成星系的径向独立的特定恒星形成率降低0.1指数所证明的那样。该研究还发现,只有在靠近星团边缘的低质量星系(<10 9.2 M⊙),根据它们对静止分数的贡献,慢猝灭才优于快猝灭。在控制了M *、z和局部过密度后,研究仍然发现静息部分存在显著的径向梯度,表明在致密环境中存在活跃的滑块压力剥离。也就是说,用其他固定参数分析静止部分的密度趋势表明,径向和密度相关的淬火过程对低质量星系团星系同样重要。研究认为,冲压压力剥离是星团中高恒星质量星系的主要环境淬火机制。相比之下,撞击压力剥离和密度相关的淬火过程在中心周围的低质量星系团中起着相当的作用。在星团边界附近,饥饿和骚扰成为低恒星质量星系的主要猝灭过程。
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来源期刊
Astrophysical Journal
Astrophysical Journal 地学天文-天文与天体物理
CiteScore
8.40
自引率
30.60%
发文量
2854
审稿时长
1 months
期刊介绍: The Astrophysical Journal is the foremost research journal in the world devoted to recent developments, discoveries, and theories in astronomy and astrophysics.
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