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arXiv 2001.11418astro-ph.GA
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Barred S0星系IC676中双核的性质

The Nature of the Double Nuclei in the Barred S0 Galaxy IC676

Zhimin Zhou, Jun Ma, Xu Zhou, Hong Wu

摘要:

透镜星系IC 676是一个棒星系,具有双核,中心区域有活跃的恒星形成。在这项工作中,我们提出了长缝光谱和档案多波长图像研究的性质和起源的双核IC 676。通过光度计的一维亮度剖面和二维图像分解,我们发现该星系由一个$\sim$为2.5 kpc的恒星棒和两个Sérsic指数为$\it n \sim$ 1.3的Sérsic盘组成. IC 676中可能很少或没有组装凸起组件。双核的光度主要由年龄在1- 1000万年之间的年轻恒星星族决定。北核比南核有更强的恒星形成活动。双核恒星形成率的面密度与星暴星系或旋涡星系的环核恒星形成区的面密度相似。IC 676中的每个双核都可能由年轻的大质量星团组成,在HST高分辨率图像中可以分辨为明亮的节点。我们的研究结果表明,IC 676可能有一个复杂的形成和进化历史。由恒星棒和外部吸积驱动的长期过程可能控制其双核的形成和演化。这表明,涉及内部和外部驱动的长期演化可能对透镜星系的演化有重要贡献。

英文摘要:

The lenticular galaxy IC 676 is a barred galaxy with double nuclei and active star formation in the central region. In this work we present the long-slit spectroscopy and archival multi-wavelength images to investigate the nature and origin of the double nuclei in IC 676. Through photometric 1D brightness profiles and 2D image decomposition, we show that this galaxy consists of a stellar bar with the length of $\sim$ 2.5 kpc and two Sérsic disks both of which with Sérsic index $\it n \sim$ 1.3. There is probably little or no bulge component assembled in IC 676. The luminosities of the double nuclei are primarily dominated by young stellar populations within the ages of 1-10 Myr. The northern nucleus has stronger star formation activity than the southern one. The surface densities of the star formation rate in the double nuclei are similar to those in starburst galaxies or the circumnuclear star forming regions in spiral galaxies. Each of the double nuclei in IC 676 likely consists of young massive star clusters, which can be resolved as bright knots in the HST high resolution image. Our results suggest that IC 676 likely has a complex formation and evolutionary history. The secular processes driven by the stellar bar and external accretion may dominate the formation and evolution of its double nuclei. This indicates that the secular evolution involving the internal and external drivers may have an important contribution for the evolution of lenticular galaxies.

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