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arXiv 2603.22166astro-ph.GA
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J-PAS:在稀疏潮汐特征中实现前所未有的恒星群体精度

J-PAS: unprecedented precision in stellar populations of diffuse tidal features

Centro de Estudios de Física del Cosmos de Aragón (CEFCA)(阿拉贡宇宙物理研究中心);Instituto de Astrofísica de Canarias(加那利群岛天体物理学研究所);Departamento de Astrofísica, Universidad de La Laguna(拉帕尔马大学天体物理学系)
Sepideh Eskandarlou, Mohammad Akhlaghi, Francisco Arizo-Borillo, Johan H. Knapen, Helena Domínguez Sánchez, Juan Antonio Fernández-Ontiveros, Carlos López-Sanju… 展开作者

Sepideh Eskandarlou, Mohammad Akhlaghi, Francisco Arizo-Borillo, Johan H. Knapen, Helena Domínguez Sánchez, Juan Antonio Fernández-Ontiveros, Carlos López-Sanjuan, Rosa María González Delgado, Yolanda Jiménez Teja, Renato Dupke, Yves Revaz, Pascale Jablonka, Santi Roca-Fábrega, Juan Miró-Carretero, David Martínez-Delgado, Alejandro Lumbreras-Calle, Antonio Hernán-Caballero, Héctor Vázquez Ramió, Raúl Infante-Sainz, Ana L. Chies-Santos, Alessandro Ederoclite, Julio Esteban Rodríguez Martín, Raul Abramo, Jailson Alcaniz, Narciso Benitez, Silvia Bonoli, Javier Zaragoza, Saulo Carneiro, Javier Cenarro, David Cristóbal-Hornillos, Simone Daflon, Carlos Hernández-Monteagudo, Jifeng Liu, Antonio Marín Franch, Claudia Mendes de Oliveira, Mariano Moles, Fernando Roig, Laerte Sodré, Keith Taylor, Jesús Varela, José Manuel Vilchez

AI总结:

J-PAS通过高精度光谱数据揭示了稀疏潮汐特征中恒星群体的特性,改进了恒星质量与Dn(4000)的测量精度,并评估了SDSS滤波器估计质量-光比的偏差。

摘要:

星系频繁与邻近系统相互作用,这一过程会显著改变其形态和恒星形成活动。然而,对其微弱和稀疏残余的光谱研究需要极长的曝光时间,通常超出积分场单元(IFUs)的有限视场。另一方面,宽波段成像具有更宽的视场,但缺乏光谱分辨率来识别关键光谱特征,限制了对恒星群体属性的准确约束。J-PAS拥有54个窄波段滤光片,在光学和宽覆盖(计划8000平方度)方面填补了这一空白。在本案例研究中,我们分析了PGC 3087775,这是一个在J-PAS早期数据释放中处于主要并合后期阶段的大质量星系(z = 0.046179 (~ 201 Mpc))。通过MaNGA IFU数据(用于核心部分)验证了光度学。利用J-PAS和SDSS光度学数据推导了恒星群体属性。SDSS显示了一个金属丰富的群体,具有扩展的恒星形成历史(SFH)和升高的恒星形成率。J-PAS则指向一个较少金属的群体,具有中等的消光和更快的SFH,与淬熄的恒星群体一致。潮汐特征的平均Dn(4000)指数为1.24,表明这是一个非干涸的并合,J-PAS在恒星质量和Dn (4000)的精度上实现了四倍的改进。我们还评估了两种启发式方法,用于从SDSS滤波器估计质量-光比,并发现它们在本星系中相对于J-PAS和SDSS的SED拟合结果分别高估了0.5 dex和0.4 dex的恒星质量。未来的工作将扩展此分析到更多并合星系的样本,并对这些结构在附近宇宙中的恒星群体演变进行前所未有的详细研究。该项目完全可复现,通过Maneage(提交0f0d7e2)。

英文摘要:

Galaxies frequently interact with nearby systems, a process that can significantly alter their morphology and star formation activity. However, spectroscopic studies of their faint and diffuse remnants require very long exposure times and often exceed the limited field of view of integral field units (IFUs). On the other hand, broad-band imaging can have a much wider field of view, but lacks the spectral resolution to identify key spectral features, restricting accurate constraints on stellar population properties. With its 54 narrow-band filters in the optical and wide coverage (planned 8000 square degrees), J-PAS fills this gap. In this case study, we examine PGC 3087775, a massive galaxy at z = 0.046179 (~ 201 Mpc) in the later stages of a major merger in the J-PAS early data release. Photometry was validated with MaNGA IFU data (for the central part). Stellar population properties was derived using both J-PAS and SDSS photometry. SDSS indicates a metal-rich population with an extended star formation history (SFH) and elevated star formation rates. J-PAS instead points to a less metal-rich population with moderate extinction and a more rapid SFH, consistent with a quenched stellar population. The average Dn(4000) index of the tidal features is 1.24, suggesting that it was a non-dry merger and a fourfold improvement in the precision of stellar mass and Dn (4000) was found with J-PAS. We also assessed two heuristic methods for estimating the mass-to-light ratio from SDSS filters and found that they overestimate the stellar mass in this galaxy by 0.5 dex and 0.4 dex relative to SED fitting results from J-PAS and SDSS, respectively. Future work will extend this analysis to a larger sample of merging galaxies and evolution of the stellar populations of such structures across the nearby Universe to unprecedented detail. This project is fully reproducible, through Maneage (commit 0f0d7e2).

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。

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