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arXiv 2609.15535astro-ph.GA

ALMA-JELLY II. 约束冲压剥离星系中熄灭时标的径向轮廓

ALMA-JELLY II. Constraining the radial profiles of the quenching timescales in ram-pressure-stripped galaxies

Roberto P. Infurna, Matteo Fossati, Alessandro Boselli, Michele Fumagalli, Jeffrey D. P. Kenney, Pavel Jáchym, Ming Sun, Elias Brinks, Françoise Combes, Patrici… 展开作者

Roberto P. Infurna, Matteo Fossati, Alessandro Boselli, Michele Fumagalli, Jeffrey D. P. Kenney, Pavel Jáchym, Ming Sun, Elias Brinks, Françoise Combes, Patricia da Silva, Romana Grossová, Stephen Gwyn, Kokoro Hosogi, Alessandro Ignesti, Jin Koda, Jan Palouš, Nathanael Pichette, Sujith Ranasinghe, Tom C. Scott, Harrison J. Souchereau, Juhi Tiwari, Bernd Vollmer, Norbert Werner, Masafumi Yagi

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中文总结 AI 辅助

本研究利用ALMA-JELLY数据结合光谱与测光,分析11个星系团中星系的冲压剥离熄灭过程,发现大质量星系呈由外向内熄灭(内外时差约500 Myr),低质量星系熄灭更快(约300 Myr),揭示共同演化序列。

中文摘要 AI 辅助

我们研究了邻近的彗发星系团、矩尺座星系团和A1367星系团中11个星系的環境熄灭历史和冲压剥离的空间进程。作为ALMA-JELLY大计划的一部分,我们将高灵敏度VLT/MUSE积分场光谱与37个空间分辨盘状孔径中的紫外至远红外测光相结合。样本覆盖log(M*/M⊙)~7.5-10.5,包括通过显著Hα或UV尾迹识别出的正在经历或近期经历冲压剥离的星系。我们使用具有指数递减恒星形成历史的贝叶斯光谱光度建模,并通过模拟数据表明,光谱与测光的结合打破了参数简并,提高了熄灭年龄的约束。所有星系均显示出熄灭的外盘和相对年老(≲1 Gyr)的恒星族群。大质量星系(log(M*/M⊙)>9.5)表现出清晰的由外向内熄灭:内部区域比外围晚约500 Myr熄灭。尽管环境和剥离几何存在差异,但熄灭年龄随截断半径距离的离散度较小,表明存在共同的演化序列。低质量和矮星系反而显示出较弱的径向梯度,熄灭发生得更快,通常在300 Myr内。

英文摘要

We investigate the environmental quenching histories and spatial progression of ram-pressure stripping in 11 galaxies in the nearby Coma, Norma, and A1367 clusters. As part of the ALMA-JELLY large program, we combine high-sensitivity VLT/MUSE integral-field spectroscopy with ultraviolet-to-far-infrared photometry in 37 spatially resolved disc apertures. The sample spans $\log(M_*/\mathrm{M}\odot)\sim7.5-10.5$ and includes galaxies undergoing active or recent ram-pressure stripping, identified through prominent H$α$ or UV tails. We use Bayesian spectrophotometric modelling with exponentially declining star-formation histories and show with mock data that combining spectra and photometry breaks parameter degeneracies and improves quenching-age constraints. All galaxies show quenched outer discs and relatively old ($\lesssim1$ Gyr) stellar populations. Massive galaxies ($\log(M_*/\mathrm{M}_\odot)>9.5$) exhibit clear outside-in quenching: inner regions quench about 500 Myr later than their outskirts. The small scatter in quenching age with distance from the truncation radius, despite differences in environment and stripping geometry, points to a common evolutionary sequence. Low-mass and dwarf galaxies instead show weak radial gradients, with quenching occurring more rapidly, typically within 300 Myr.

发表机构

  • Università di Milano-Bicocca(米兰比可卡大学)
  • INAF - Osservatorio Astronomico di Brera(意大利国家天体物理研究所布雷拉天文台)
  • Aix Marseille Univ, CNRS, CNES, LAM(艾克斯-马赛大学、法国国家科学研究中心、法国国家空间研究中心、天体物理与行星学实验室)
  • INAF - Osservatorio Astronomico di Cagliari(意大利国家天体物理研究所卡利亚里天文台)
  • INAF - Osservatorio Astronomico di Trieste(意大利国家天体物理研究所的里雅斯特天文台)
  • Yale University(耶鲁大学)
  • Astronomical Institute of the Czech Academy of Sciences(捷克科学院天文研究所)
  • The University of Alabama in Huntsville(阿拉巴马大学亨茨维尔分校)
  • University of Hertfordshire Centre for Astrophysics Research(赫特福德大学天体物理学研究中心)
  • Observatoire de Paris, LUX, Collège de France, CNRS, PSL University, Sorbonne Uni(巴黎天文台、卢克瑟姆实验室、法兰西学院、法国国家科学研究中心、巴黎文理研究大学、索邦大学)

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