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arXiv 2401.01931astro-ph.GA
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All Puffed Up: 通过星系相互作用探索超弥散星系的起源

All Puffed Up: Exploring Ultra-diffuse Galaxy Origins through Galaxy Interactions

Catherine Fielder, Michael Jones, David Sand, Paul Bennet, Denija Crnojevic, Ananthan Karunakaran, Burcin Mutlu-Pakdil, Kristine Spekkens

AI总结:

本研究通过哈勃望远镜和甚大阵观测两颗具潮汐特征的超弥散星系,结合CFHTLS样本分析,指出潮汐作用是其弥散形态的可能成因,同时强调需更广泛巡天以明确星系相互作用的影响。

摘要:

我们对两颗因形态扭曲、存在潮汐特征(表明受潮汐影响)而被选中的超弥散星系(UDG)开展了新的后续观测。利用哈勃空间望远镜高级巡天相机的F555W和F814W波段成像数据,我们在KUG 0203-Dw1中识别出$8\boldsymbol{\rm{\boldsymbol{\text{±}}}}2$个球状星团(GC),在KDG 013中识别出$6\boldsymbol{\rm{\boldsymbol{\text{±}}}}2$个,该丰度与具有相似恒星质量的普通矮星系的典型水平一致。扬斯基甚大阵的数据显示,KUG 0203-Dw1存在清晰的中性氢(HI)探测信号,其气体质量估计为$\boldsymbol{\rm{\boldsymbol{\text{log}}}}M_{\rm{HI}}/M_{\boldsymbol{\rm{\boldsymbol{\text{⊙}}}}}\boldsymbol{\rm{\boldsymbol{\text{≲}}}}7.4$,且存在被宿主星系主动剥离的证据,而KDG 013未探测到清晰的气体信号。这两个UDG很可能起源于普通矮星系,这些矮星系经历了显著的物质剥离和潮汐加热,导致自身变得更为弥散。这两个UDG补充了加拿大-法国-夏威夷望远镜遗产巡天(CFHTLS;约$150^{2}$平方度)全域内存在潮汐特征的5个UDG样本。这些受潮汐影响的UDG表现出多样的性质:其中一个尤为特殊,可能是矮星系并合的产物,其余则符合潮汐加热的起源机制。我们也无法最终排除这些星系在进入星系群环境受作用之前,就已在场环境中成为UDG的可能性,这凸显了开展更广泛弥散星系巡天、以更好理解星系相互作用影响的必要性。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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