WALLABY Pilot Survey: First Look at the Hydra I Cluster and Ram Pressure Stripping of ESO 501-G075
T. N. Reynolds, T. Westmeier, A. Elagali, B. Catinella, L. Cortese, N. Deg, B. -Q. For, P. Kamphuis, D. Kleiner, B. S. Koribalski, K. Lee-Waddell, S. -H. Oh, J.… 展开作者
T. N. Reynolds, T. Westmeier, A. Elagali, B. Catinella, L. Cortese, N. Deg, B. -Q. For, P. Kamphuis, D. Kleiner, B. S. Koribalski, K. Lee-Waddell, S. -H. Oh, J. Rhee, P. Serra, K. Spekkens, L. Staveley-Smith, A. R. H. Stevens, E. N. Taylor, J. Wang, O. I. Wong
备注：
14 pages, 11 figures, accepted for publication in MNRAS
We present results from neutral atomic hydrogen (HI) observations of Hydra I, the first cluster observed by the Widefield ASKAP L-band Legacy All-sky Blind Survey (WALLABY) on the Australian Square Kilometre Array Pathfinder. For the first time we show that WALLABY can reach its final survey sensitivity. Leveraging the sensitivity, spatial resolution and wide field of view of WALLABY, we identify a galaxy, ESO 501-G075, that lies near the virial radius of Hydra I and displays an HI tail. ESO 501-G075 shows a similar level of morphological asymmetry as another cluster member, which lies near the cluster centre and shows signs of experiencing ram pressure. We investigate possible environmental processes that could be responsible for producing the observed disturbance in the HI morphology of ESO 501-G075. We rule out tidal interactions, as ESO 501-G075 has no nearby neighbours within $\sim0.34$Mpc. We use a simple model to determine that ram pressure can remove gas from the disc at radii $r\gtrsim25$kpc. We conclude that, as ESO 501-G075 has a typical HI mass compared to similar galaxies in the field and its morphology is compatible with a ram pressure scenario, ESO 501-G075 is likely recently infalling into the cluster and in the early stages of experiencing ram pressure.
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
Instituto de Astrofísica de Andalucía (CSIC)（安达卢西亚天体物理研究所）；Chalmers University of Technology（查尔姆斯理工大学）；ASTRON, the Netherlands Institute for Radio Astronomy（荷兰射电天文研究所）；University of Wisconsin-Madison（威斯康星大学麦迪逊分校）；Zhejiang Laboratory（浙江实验室）；University of Cape Town（开普敦大学）；University of Hawaii at Hilo（夏威夷大学希洛分校）；Western Sydney University（西悉尼大学）；Swinburne University of Technology（斯威本科技大学）；University of the Western Cape（西开普大学）
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）
Intracluster globular clusters as tracers of the mass assembly of the Hydra I galaxy cluster
European Southern Observatory（欧洲南方天文台）；Universitätssternwarte der Ludwig-Maximilians Universität（路德维希-马克西米利安大学大学天文台）；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）；Max-Planck-Institut für Extraterrestrische Physik（马克斯·普朗克地外物理学研究所）；INAF – Astronomical Observatory of Abruzzo（意大利国家天体物理研究所阿布鲁佐天文台）；Gran Sasso Science Institute（格兰萨索科学研究所）
