FEAST: probing the stellar population of the starburst dwarf galaxy NGC4449 with JWST/NIRCam
Matteo Correnti, Giacomo Bortolini, Flavia Dell'Agli, Angela Adamo, Michele Cignoni, Elena Sacchi, Monica Tosi, Alex Pedrini, Anne S. M. Buckner, Daniela Calzet… 展开作者
Matteo Correnti, Giacomo Bortolini, Flavia Dell'Agli, Angela Adamo, Michele Cignoni, Elena Sacchi, Monica Tosi, Alex Pedrini, Anne S. M. Buckner, Daniela Calzetti, Ana Duarte-Cabral, Bruce G. Elmegreen, Helena Faustino Vieira, John S. Gallagher, Kathryn Grasha, Benjamin Gregg, Kelsey E. Johnson, Thomas S. -Y. Lai, Drew Lapeer, Sean T. Linden, Matteo Messa, Goran Ostlin, Elena Sabbi, Linda J. Smith, Paolo Ventura
我们展示了星暴不规则星系 NGC 4449 的新 JWST/NIRCam 观测数据，这些数据是在第 1 周期作为“新兴河外星团中的反馈”（FEAST）项目的一部分获得的，我们利用这些数据研究其可分辨的恒星族及其空间分布。NGC4449 的近红外颜色-星等图揭示出广泛的恒星族，涵盖不同的演化阶段，从年轻的主序星，到年老的红巨星支恒星和渐近巨星支（AGB）恒星。对其空间分布的分析表明，较年轻（< 10 Myr）的恒星族形成与星系南北轴对齐的 S 形分布，而年龄为 10–60 Myr 的恒星则显示出从北到南的集中度变化，这与外部相互作用或潮汐效应可能在空间上不同的爆发中触发恒星形成的可能性一致。年龄相当的星团通常遵循这些分布，表明星团恒星和场恒星在星系每个区域以相同的节奏形成。得益于 JWST 数据前所未有的高空间分辨率和灵敏度，我们恢复了 AGB 族中富氧分支与碳星分支之间的清晰间隙，以及一个巨大 AGB 星“指状结构”的存在。对这些恒星的分析可以为该星系中的 AGB 演化模型和尘埃产生提供约束。这些结果证实了 NGC 4449 作为一个引人注目的本地矮星暴星系范例的地位，该星系正在经历复杂的、可能由外部驱动的恒星形成，并凸显了 JWST 在探测邻近星暴系统中恒星完整生命周期方面的能力。
英文摘要：
We present new JWST/NIRCam observations of the starburst irregular galaxy NGC 4449, obtained in Cycle 1 as part of the Feedback in Emerging extrAgalactic Star clusTers (FEAST) program, which we use to investigate its resolved stellar populations and their spatial distributions. NGC4449 NIR color-magnitude diagrams reveal a broad range of stellar populations, spanning different evolutionary phases, from young main sequence stars, to old red giant branch stars and asymptotic giant branch (AGB) stars. The analysis of their spatial distributions shows that younger (< 10 Myr) populations form an S-shaped distribution aligned with the galaxy's north-south axis, while stars aged 10 - 60 Myr show shifting concentrations from the north to the south, consistent with the possibility that external interactions or tidal effects may have triggered star formation in spatially distinct bursts. Clusters of comparable ages generally follow these distributions, suggesting that cluster and field stars form at the same pace in each galaxy region. Thanks to the unprecedented high-spatial resolution and sensitivity of the JWST data we recover a clear gap between Oxygen-rich and the carbon star branch of the AGB population and the presence of a massive AGB star "finger". The analysis of these stars can provide constraints on AGB evolution models and dust production in this galaxy. These results confirms NGC 4449 status as a compelling example of a local dwarf starburst galaxy undergoing complex and possibly external driven star formation and underscore the power of JWST in probing the full lifecycle of stars in nearby starburst systems.
FEAST: a NIRSpec/MOS survey of emerging young star clusters in NGC 628
Stockholm University（斯德哥尔摩大学）；Space Telescope Science Institute（太空望远镜科学研究所）；California Institute of Technology（加州理工学院）；INAF – Osservatorio Astrofisico di Arcetri（意大利国家天体物理研究所-阿尔切特里天文台）；University of Arizona（亚利桑那大学）
Faint galaxies in the Zone of Avoidance revealed by JWST/NIRCam
Universidad de La Serena（拉塞雷纳大学）；Instituto de Astronomía Teórica y Experimental, (IATE-CONICET)（理论与实验天文研究所）；Observatorio Astronómico de Córdoba, Universidad Nacional de Córdoba（科尔多瓦天文台，科尔多瓦国立大学）；Steward Observatory, University of Arizona（斯图尔德天文台，亚利桑那大学）；Instituto de Investigación en Astronomía y Ciencias Planetarias, Universidad de Atacama（天文学与行星科学研究所，阿塔卡马大学）；Instituto de Astrofísica, Facultad de Ciencias Exactas, Universidad Andrés Bello（天体物理研究所，精确科学学院，安德烈斯·贝略大学）；Vatican Observatory（梵蒂冈天文台）
JWST Advanced Deep Extragalactic Survey (JADES) Data Release 5: NIRCam Imaging in GOODS-S and GOODS-N
Department of Astronomy and Astrophysics, University of California, Santa Cruz（加州大学圣克鲁兹分校天文与天体物理系）；Kavli Institute for Cosmology, University of Cambridge（剑桥大学卡弗里宇宙学研究所）；Cavendish Laboratory, University of Cambridge（剑桥大学卡文迪许实验室）；Steward Observatory, University of Arizona（亚利桑那大学斯图尔德天文台）
Disk-like galaxies at 4 < z < 7.7 : JWST/NIRCam morphologies revealed by denoising VAE-GCNN classification
Center for Cosmology and Astrophysics, Alikhanyan National Laboratory（阿利哈尼扬国家实验室宇宙学与天体物理中心）；Yerevan State University（埃里温国立大学）；SIA, Sapienza University of Rome（罗马智慧大学天体物理研究所）
研究利用去噪VAE-GCNN分类方法分析JWST/NIRCam多滤光片切片，确定红移4 < z < 7.7范围内盘状星系占比为0.34，揭示高红移星系中盘状结构的重要性。
JWST Advanced Deep Extragalactic Survey (JADES) Data Release 5: Catalogs of inferred morphological properties of galaxies from JWST/NIRCam imaging in GOODS-N and GOODS-S
University of California, Santa Cruz（加州大学圣克鲁兹分校）；University of Cambridge（剑桥大学）；University of Arizona（亚利桑那大学）；The University of Texas at Austin（德克萨斯大学奥斯汀分校）；Niels Bohr Institute, University of Copenhagen（哥本哈根大学尼尔斯·玻尔研究所）；Cosmic Dawn Center (DAWN)（宇宙黎明中心）；University of Hertfordshire（赫特福德大学）；The Johns Hopkins University（约翰斯·霍普金斯大学）；University College London（伦敦大学学院）；Space Telescope Science Institute（太空望远镜科学研究所）；NSF National Optical-Infrared Astronomy Research Laboratory（美国国家光学-红外天文研究实验室）
Slitless Areal Pure-Parallel HIgh-Redshift Emission Survey (SAPPHIRES): Early Data Release of Deep JWST/NIRCam Images and Spectra in MACS J0416 Parallel Field
Feedback in emerging extragalactic star clusters, FEAST: The relation between 3.3 $μ$m PAH emission and Star Formation Rate traced by ionized gas in NGC 628
Detection of new galaxy candidates at z > 11 in the JADES field using JWST NIRCam
Department of Physics, University of Arkansas（阿肯色大学物理系）；Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology（麻省理工学院卡弗里天体物理与空间研究研究所）；Stony Brook University（石溪大学）
Assessing the Impact of Source Confusion for GREX-PLUS based on Deep JWST NIRCam Imaging
Institute for Cosmic Ray Research, The University of Tokyo（东京大学宇宙线研究所）；Waseda Research Institute for Science and Engineering, Faculty of Science and Engineering, Waseda University（早稻田大学理工学府理工学研究科理工学研究院）；Department of Pure and Applied Physics, School of Advanced Science and Engineering, Faculty of Science and Engineering, Waseda University（早稻田大学理工学府理工学研究科理工学部应用物理学科）；Department of Astronomy, Kyoto University（京都大学天文学系）；Photocross., Co. Ltd.（Photocross有限公司）
Searching for Extremely Blue UV Continuum Slopes at $z=7-11$ in JWST/NIRCam Imaging: Implications for Stellar Metallicity and Ionizing Photon Escape in Early Galaxies
AGNBoost: A Machine Learning Approach to AGN Identification with JWST/NIRCam+MIRI Colors and Photometry
University of Kansas（堪萨斯大学）；Rochester Institute of Technology（罗切斯特理工学院）；Colby College（科尔比学院）；Space Telescope Science Institute（太空望远镜科学研究所）；NASA-Goddard Space Flight Center（美国宇航局戈达德太空飞行中心）；Texas A&M University（得克萨斯农工大学）
No hidden monsters: Probing recently-quenched galaxies for obscured AGN with JWST-PRIMER MIRI and NIRCam
University of Nottingham（诺丁汉大学）；Johns Hopkins University（约翰斯·霍普金斯大学）；Space Telescope Science Institute（太空望远镜科学研究所）；University of Edinburgh（爱丁堡大学）；University of St Andrews（圣安德鲁斯大学）
