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。
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.