arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2602.03088astro-ph.GA
收藏

SAMI星系调查:团块中恒星形成淬灭 III. 受湍流压力影响的星系群体

The SAMI Galaxy Survey: Quenching of Star Formation in Clusters III. Ram-Pressure-Affected Galaxy Populations

Macquarie University(麦考瑞大学);Centre for Astrophysics and Supercomputing, Swinburne University of Technology(斯威本科技大学天体物理学与超级计算中心);School of Mathematics and Physics, University of Queensland(昆士兰大学数学与物理学院);Australian Astronomical Optics, Macquarie University(麦考瑞大学澳大利亚光学天文台)
Oğuzhan Çakır, Matt S. Owers, Luca Cortese, Mina Pak, Gabriella Quattropani, Stefania Barsanti, Julia J. Bryant, Warrick J. Couch, Scott M. Croom, Pratyush K. D… 展开作者

Oğuzhan Çakır, Matt S. Owers, Luca Cortese, Mina Pak, Gabriella Quattropani, Stefania Barsanti, Julia J. Bryant, Warrick J. Couch, Scott M. Croom, Pratyush K. Das, Jon S. Lawrence, Yifan Mai, Andrei Ristea, Sebastian F. Sánchez, Sarah Sweet, Jesse van de Sande, Glenn van de Ven, Sukyoung K. Yi

AI总结:

SAMI星系调查研究了团块中受湍流压力影响的星系群体,发现不对称和截断星系在恒星形成活动上表现出更陡峭的主序列关系,表明外向内淬灭过程。

摘要:

星系团环境通过限制恒星形成活动影响星系演化,特别是在通过湍流压力剥离(RPS)方面。在本研究中,利用SAMI星系调查的空间解析光谱数据,我们通过基于电离气体(Hα+[NII]λ6584)形态的视觉分类方案,识别出八个近邻团块(0.029 < z < 0.058)中正在经历或最近受RPS影响的星系,分为未受扰动、不对称和截断三类。投影相空间分析显示,不对称星系出现在团块中心距离的狭窄区域(0.1 < R/R200 < 0.6)并且在视线速度方向上具有更大的分散度(σ(|vpec|)Asym = 0.71±0.09σ200),与截断和未受扰动样本相比。在恒星形成活动方面,RPS候选者显示出比未受扰动对应者更陡峭的解析恒星形成主序列(rSFMS;ΣSFR - Σ*)关系,主要源于在低质量密度区域具有较低的ΣSFR值,最陡的梯度来自截断样本。此外,径向恒星形成剖面揭示了RPS候选者的恒星形成活动在边缘地区相对于未受扰动星系被抑制,并且在截断样本中更为显著。相反,RPS候选星系中心(r/reff < 0.5)的恒星形成活动与它们的未受扰动和场对应物相当,表明没有增强的活动。综合来看,这表明与RPS阶段相关的一种进化趋势,其中未受扰动星系可能代表最近被吞噬的系统(预RPS),而不对称和截断星系可能对应于经历RPS和后RPS阶段的群体,分别倾向于外向内淬灭。

英文摘要:

Cluster environments influence galaxy evolution by curtailing star formation activity, notably through ram-pressure stripping (RPS). In this study, using spatially resolved spectroscopic data from the SAMI Galaxy Survey, we identify galaxies undergoing or recently affected by RPS in eight nearby clusters ($0.029 < z < 0.058$), through a visual classification scheme based on the ionised gas ($\rm Hα+ [NII]λ6584$) morphologies, split into unperturbed, asymmetric, and truncated. The projected phase-space analysis shows that asymmetric galaxies are found in a narrow region in cluster-centric distance ($\rm 0.1 < R/R_{200} < 0.6$) and have a larger dispersion in line-of-sight velocity ($σ(|v_{pec}|)_\mathrm{Asym} = 0.71^{+0.09}_{-0.07}\ σ_{200}$) compared to the truncated and unperturbed samples. In terms of star formation activity, RPS candidates yield a much steeper resolved star-forming main sequence (rSFMS; $Σ_\mathrm{SFR} - Σ_\ast$) relation compared to the unperturbed counterparts, primarily emerging from having lower $Σ_\mathrm{SFR}$ values for the low mass density regime, with the steepest gradient deriving from the truncated sample. Moreover, radial star formation profiles reveal that star formation in RPS candidates is suppressed in the outskirts relative to unperturbed galaxies and is more prominent for the truncated sample. In contrast, central ($\rm r/r_{eff}<0.5$) star formation activity in RPS candidates is comparable with that in their unperturbed and field counterparts, suggesting no elevated activity. Taken together, this suggests an evolutionary trend linked to the RPS stage, where unperturbed galaxies likely represent recently accreted systems (pre-RPS), while asymmetric and truncated galaxies may correspond to populations undergoing RPS and post-RPS phases, respectively, favouring outside-in quenching.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑