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arXiv 2609.27126astro-ph.GAastro-ph.SR

N159 内的序恒星形成与近红外恒星族

Sequential Star-Formation and the Near-Infrared Stellar Populations within N159

  • Jet Propulsion Laboratory, California Institute of Technology(加州理工学院喷气推进实验室)
  • Department of Astronomy, California Institute of Technology(加州理工学院天文学系)
  • NSF NOIRLab(美国国家光学红外天文科学研究基金会NOIRLab)
  • AURA for the European Space Agency(欧洲空间局AURA)
  • Space Telescope Science Institute(太空望远镜科学研究所)
  • European Space Research and Technology Centre(欧洲空间研究与技术中心)
  • Department of Physics & Engineering Physics, Morgan State University(摩根州立大学物理与工程物理系)
  • National Radio Astronomy Observatory(美国国家射电天文台)
  • Department of Physics, Maynooth University(梅努斯大学物理系)

机构由 AI 辅助整理,请以论文原文为准。

Nolan Habel, E. Sabbi, Peter Zeidler, Tuila Ziliotto, Laurie Chu Margaret Meixner, Guido De Marchi, O. C. Jones, Alec S. Hirschauer, Beena Meena, Jeroen Jaspers… 展开作者

Nolan Habel, E. Sabbi, Peter Zeidler, Tuila Ziliotto, Laurie Chu Margaret Meixner, Guido De Marchi, O. C. Jones, Alec S. Hirschauer, Beena Meena, Jeroen Jaspers, Laura Lenkic, Remy Indebetouw, Karl D. Gordon, Burcu Gunay, Suzanne Madden, James Muzerolle Page, Omnarayani Nayak, Antonella Nota, Theo Oneill, Massimo Robberto, Tony Wong, Petia Yanchulova Mercia-Jones

AI总结:

本研究利用 JWST/NIRCam 数据研究大麦哲伦云中的恒星形成区 N159,发现年轻恒星族和候选 YSO,并证实了该区域存在大规模序恒星形成。

AI中文摘要:

我们展示了 JWST/NIRCam 对大麦哲伦云中最丰富的 H II 复合体之一的恒星形成区 N159 研究的首批结果。该区域延伸约 130 秒差距,体现了大规模序恒星形成。我们结合十个覆盖 1-4.7 微米的近红外 JWST 滤光片数据,展示了超过 30 万个点源的光度测量结果。我们在 F115W 波段探测到暗至约 27 星等的源,对应恒星质量低至约 0.1 太阳质量。通过构建多个颜色-星等图和颜色-颜色图,我们将 N159 内的年轻恒星与主序星和较老恒星区分开来,发现了年龄小于 0.5 百万年的恒星族的证据。在年轻恒星族中,我们根据其帕申-α(Paα)超量识别出正在吸积的前主序星,以及一群具有强红外(IR)超量的源,它们代表候选的年轻恒星天体(YSO)。在这一群体中,我们识别出一个具有 H₂O 冰吸收的亚群。带有红外超量的 YSO 候选体在空间上与尘埃细丝和分子气体相关,表明它们处于嵌入状态。N159 中恒星和候选 YSO 群体的分布揭示了 N159E 区域中更演化的恒星形成群体,以及 N159W 区域中更新的恒星形成,支持了该区域的序恒星形成情景。

英文摘要:

We present the first results from a JWST/NIRCam study of the star-forming region N159, one of the richest H II complexes in the Large Magellanic Cloud. This region stretches over $\sim$130 pc, and exemplifies large-scale sequential star formation. We present photometric results of $>$300,000 point sources combining data from ten near-infrared JWST filters spanning 1-4.7 microns. We detect sources as faint as $\sim$27 magnitudes at F115W, corresponding to stellar masses reaching below $\sim$0.1 $M_{\odot}$. By constructing several color-magnitude and color-color diagrams, we separate young stars from main-sequence and older stars within N159, finding evidence for stellar populations younger than 0.5 Myr. Of the young population, we identify accreting, pre-main sequence stars from their Paschen-$α$ (Pa$α$) excess and a population of sources bearing strong infrared (IR) excess, representing candidate young stellar objects (YSOs). Within this population, we identify a subpopulation of sources with H$_2$O ice absorption. The IR-excess-bearing YSO candidates correlate spatially with dust filaments and molecular gas demonstrating their embedded state. The distribution of stellar and candidate YSO populations across N159 reveal more evolved star-forming populations in the N159E region and newer star formation in the N159W region, supporting the sequential star formation scenario for this region.

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