We present new follow-up observations of two ultra-diffuse galaxies (UDGs) selected for their distorted morphologies and tidal features, suggestive of tidal influence. Using Hubble Space Telescope Advanced Camera for Surveys F555W and F814W imaging, we identify $8\pm2$ globular clusters (GCs) in KUG 0203-Dw1 and $6\pm2$ in KDG 013, abundances typical for normal dwarf galaxies of similar stellar mass. Jansky Very Large Array data reveal a clear HI detection of KUG 0203-Dw1 with a gas mass estimate of $\log{M_{\rm{HI}}/M_{\odot}}\lesssim 7.4$ and evidence of active stripping by the host, while KDG 013 has no clear gas detection. The UDGs likely originated as normal dwarf galaxies that have been subjected to significant stripping and tidal heating, causing them to become more diffuse. These two UDGs complete a sample of five exhibiting tidal features in the full Canada-France-Hawaii Telescope Legacy Survey area (CFHTLS; $\sim150^{2}$ deg). These tidally influenced UDGs exhibit diversse properties; one stands out as a potential result of a dwarf merger, while the remainder suggest tidal heating origins. We also cannot conclusively rule out that these galaxies became UDGs in the field before processing by the group environment, underscoring the need for broader searches of diffuse galaxies to better understand the impact of galaxy interactions.
Looking into the faintEst WIth MUSE (LEWIS): Exploring the nature of ultra-diffuse galaxies in the Hydra-I cluster. VI. A star-forming UDG in Hydra I: a rare UDG or a transition phase?
University of Naples “Federico II”(那不勒斯费德里科二世大学);Armagh Observatory and Planetarium(阿马赫天文台和天文馆);Gran Sasso Science Institute(格兰萨索科学研究所);Finnish Centre for Astronomy with ESO, (FINCA), University of Turku(图尔库大学芬兰ESO天文中心);Tuorla Observatory, Department of Physics and Astronomy, University of Turku(图尔库大学物理与天文学系图奥拉天文台);Turku Collegium for Science(图尔库科学学院)
Exploring the effects of diffuse ionised gas in two local analogues of high-redshift star-forming galaxies
Institute of Astrophysics, Facultad de Ciencias Exactas, Universidad Andrés Bello(安第斯贝尔纳多·乌尼维罗大学精确科学学院天体物理研究所);Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto(波尔图大学空间科学与天体物理研究所);Instituto de Astronomía y Meteorología, Universidad de Guadalajara(瓜达拉哈拉大学天文与气象研究所);Centre for Space Research, North-West University(西北大学太空研究中心);National Institute for Theoretical and Computational Sciences (NITheCS)(国家理论与计算科学研究所)
Looking into the faintEst WIth MUSE (LEWIS): on the nature of ultra-diffuse galaxies in the Hydra I cluster. V. Integrated stellar population properties
University of Naples “Federico II”(那不勒斯费德里科二世大学);Instituto de Astrofísica de Canarias(加那利群岛天体物理研究所);Universidad de La Laguna(拉古纳大学)
Looking into the faintEst WIth MUSE (LEWIS): Exploring the nature of ultra-diffuse galaxies in the Hydra-I cluster II. Stellar kinematics and dynamical masses
本研究利用 LEWIS 的 MUSE 积分场光谱测量 Hydra I 星系团 18 个 UDG 的恒星运动学与动力学质量,发现旋转与非旋转两类系统,并揭示其高暗物质占比及环境相关性较弱。
Looking into the faintEst WIth MUSE (LEWIS): Exploring the nature of ultra-diffuse galaxies in the Hydra-I cluster IV. A study of the Globular Cluster population in four UDGs
INAF Osservatorio Astr. d’Abruzzo(意大利国家天体物理研究所阿布鲁佐天文台);European Southern Observatory(欧洲南方天文台);Gran Sasso Science Institute(格兰萨索科学研究所);INAF – Astronomical Observatory of Capodimonte(意大利国家天体物理研究所卡波迪蒙特天文台);Centre for Astrophysics and Supercomputing, Swinburne University(斯威本大学天体物理学与超级计算中心);Finnish Centre for Astronomy with ESO, (FINCA), University of Turku(图尔库大学芬兰ESO天文学中心);Tuorla Observatory, Department of Physics and Astronomy, University of Turku(图尔库大学物理与天文学系图奥拉天文台);Turku Collegium for Science, Medicine and Technology(图尔库科学技术学院)
Looking into the faintEst WIth MUSE (LEWIS): Exploring the nature of ultra-diffuse galaxies in the Hydra I cluster III. Untangling UDG 32 from the stripped filaments of NGC 3314A with multi-wavelength data
Probing the dynamics of extreme galaxies I. Dark matter content in ultra-diffuse galaxies
Scuola Superiore Meridionale(南方高等学院);Istituto Nazionale di Fisica Nucleare, Sez. di Napoli(意大利国家核物理研究所那不勒斯分部);Institute of Physics, University of Szczecin(谢扎青大学物理研究所);Dipartimento di Fisica “E. Pancini”, Università degli Studi di Napoli “Federico II”(那不勒斯费德里科二世大学E.潘奇尼物理系);Dipartimento di Fisica e Astronomia “G. Galilei”, Università di Padova(帕多瓦大学G.伽利略物理与天文系)
Exploring the formation mechanisms of tidal structures in globular clusters of extragalactic origin
Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University(北京师范大学前沿天文与天体物理研究所);School of Physics and Astronomy, Beijing Normal University(北京师范大学物理与天文学院);National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);School of Astronomy and Space Science, University of Chinese Academy of Sciences(中国科学院大学天文与空间科学学院)