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arXiv 2110.04423astro-ph.GA
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J-PLUS:探测与研究河外球状星团——以 NGC 1023 为例

J-PLUS: Detecting and studying extragalactic globular clusters -- the case of NGC 1023

Danielle de Brito Silva, Paula Coelho, Arianna Cortesi, Gustavo Bruzual, Gladis Magris C., Ana L. Chies-Santos, Jose A. Hernandez-Jimenez, Alessandro Ederoclite… 展开作者

Danielle de Brito Silva, Paula Coelho, Arianna Cortesi, Gustavo Bruzual, Gladis Magris C., Ana L. Chies-Santos, Jose A. Hernandez-Jimenez, Alessandro Ederoclite, Izaskun San Roman, Jesús Varela, Duncan A. Forbes, Yolanda Jiménez-Teja, Javier Cenarro, David Cristóbal-Hornillos, Carlos Hernández-Monteagudo, Carlos López-Sanjuan, Antonio Marín-Franch, Mariano Moles, Héctor Vázquez Ramió, Renato Dupke, Laerte Sodré Jr. 2, Raul E. Angulo

AI总结:

本文利用 J-PLUS 巡天数据开发了半自动流水线 GCFinder 探测河外球状星团,在 NGC 1023 中发现 523 个候选体,通过 SED 拟合分析其恒星族群性质,揭示了该星系复杂的吸积历史并展示了多波段巡天的能力。

摘要:

河外球状星团(GCs)是研究星系历史的关键天体。Javalambre Photometric Local Universe Survey(J-PLUS)等大视场巡天的出现,为这些系统的研究提供了新的可能性。我们利用宽视场图像和 12 个滤波器,在 J-PLUS 中首次对 GCs 进行研究,恢复了关于 NGC 1023 历史的信息。我们开发了半自动流水线 GCFinder,用于在 J-PLUS 图像中探测 GC 候选体,并可适配类似的巡天。我们使用光谱能量分布(SED)拟合研究了 GC 候选体子样本的恒星族群性质。我们在 NGC 1023 中发现了 523 个 GC 候选体,其中约 300 个是新的。我们识别出 GC 候选体的子族群,其年龄和金属丰度分布具有多个峰值。通过与模拟结果进行比较,我们报告了一个可能较宽的年龄-金属丰度关系,这是 NGC 1023 过去经历过吸积事件的证据。主导的年龄峰值位于 $10^{10}$ yr。我们报告了质量与年龄之间的相关性,表明大质量 GC 候选体更有可能在宿主星系的动荡历史中幸存下来。通过对 NGC 1023 的光线进行建模,我们发现了两条类似旋臂的结构,并探测到该星系的光度中心相对于外部等照度线和 GC 分布中心存在偏移(分别约为 700 pc 和 1600 pc),这可能是 NGC 1023 与 NGC 1023A 之间持续相互作用的结果。通过使用 J-PLUS 研究 NGC 1023 的 GC 系统,我们展示了多波段巡天在此类研究中的能力,并发现了宿主星系具有复杂吸积历史的证据。

英文摘要:

Extragalactic globular clusters (GCs) are key objects for studying the history of galaxies. The arrival of wide-field surveys such as the Javalambre Photometric Local Universe Survey (J-PLUS) offers new possibilities for the study of these systems. We perform the first study of GCs in J-PLUS to recover information about the history of NGC 1023 taking advantage of wide-field images and 12 filters. We develop the semiautomatic pipeline GCFinder that detects GC candidates in J-PLUS images and can also be adapted to similar surveys. We study the stellar population properties of a sub-sample of GC candidates using spectral energy distribution (SED) fitting. We find 523 GC candidates in NGC 1023, of which $\sim$300 are new. We identify subpopulations of GC candidates, where age and metallicity distributions have multiple peaks. By comparing our results with simulations, we report a possible broad age-metallicity relation, evidence that NGC 1023 experienced accretion events in the past. The dominating age peak is at $10^{10}$ yr. We report a correlation between masses and ages that suggests that massive GC candidates are more likely to survive the turbulent history of the host galaxy. Modeling the light of NGC 1023, we find two spiral-like arms and detect a displacement of the galaxy's photometric center with respect to the outer isophotes and center of GC distribution ($\sim$700 pc and $\sim$1600 pc, respectively), which could be the result of ongoing interaction between NGC 1023 and NGC 1023A. By studying the GC system of NGC 1023 with J-PLUS we showcase the power of multi-band surveys for this kind of study and find evidence of a complex accretion history of the host galaxy.

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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