卫星星系数量分布与中心星系性质关系的研究

Q4 Physics and Astronomy

Chinese Astronomy and Astrophysics Pub Date : 2022-10-01 DOI:10.1016/j.chinastron.2022.11.003

GU Hui , WANG Peng , XU Ying-zhong , LUO Zhi-quan , QU Han , DAI Cai-ping

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引用次数: 0

摘要

卫星星系是星系形成的有力探测器。最近的研究指出，当中心星系为椭圆星系时，卫星星系比螺旋星系多。为了探索这种差异，我们使用了Next Generation Illustris simulation集的TNG300-1构建的数据。我们选择恒星质量在1010M⊙·h−1≤Mc≤1012M⊙·h−1的中心星系。同时，根据膨胀与总质量比(B/T)，将该范围内的中心星系分为螺旋星系和椭圆星系。通过运用统计方法，我们发现当晕的质量分布得到控制(螺旋和椭圆的晕质量分布完全相同)时，卫星星系的分布仍然存在新的差异。然而，螺旋形的卫星明显多于椭圆形。这个结论与观察结果相反。造成这种差异的主要原因是，螺旋的卫星星系含有更多的冷气体，这使得螺旋的卫星星系在恒星形成过程中更有效。

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Study on the Relationship between the Number Distribution of Satellite Galaxies and the Properties of Central Galaxies

Satellite galaxies are powerful probes of galaxies formation. Recent studies have pointed out that when the central galaxy is an elliptical galaxy, there are more satellite galaxies than spiral galaxies. In order to explore this difference, we used the data constructed from TNG300-1 of the Next Generation Illustris Simulations set. We select the central galaxies within $10^{10} M_{⊙} \cdot h^{- 1} \leq M_{c} \leq 10^{12} M_{⊙} \cdot h^{- 1}$ in stellar mass. At the same time, central galaxies in this range are divided into spirals and ellipticals according to the bulge-to-total mass ratio (B/T). Through the usage of statistical methods, we found that when the mass distribution of the halos is controlled (the halo mass distribution is exactly the same between spirals and ellipticals), there is still a new difference in the distribution of satellite galaxies. However, the satellites of the spirals are significantly more than ellipticals. This conclusion is contrary to observations. The main reason for this difference is that the satellite galaxies of spirals contain more cold gas, which makes the satellites of spirals more efficient in star formation.

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来源期刊

Chinese Astronomy and Astrophysics Physics and Astronomy-Astronomy and Astrophysics

CiteScore

0.70

自引率

0.00%

发文量

期刊介绍： The vigorous growth of astronomical and astrophysical science in China led to an increase in papers on astrophysics which Acta Astronomica Sinica could no longer absorb. Translations of papers from two new journals the Chinese Journal of Space Science and Acta Astrophysica Sinica are added to the translation of Acta Astronomica Sinica to form the new journal Chinese Astronomy and Astrophysics. Chinese Astronomy and Astrophysics brings English translations of notable articles to astronomers and astrophysicists outside China.