论文标题
S2COSMOS：使用粉尘发射的红移加速质量的演变
S2COSMOS: Evolution of Gas Mass with Redshift Using Dust Emission
论文作者
论文摘要
我们使用850美元$ $ m的灰尘从灰尘中的亚毫米表排放来研究宇宙场中星系的气体质量分数的演变。我们在850 $ $ m s2cosmos映射上使用堆叠方法来推导星系的气体质量到高红移，0 <= $ z $ <= 5，对于具有$ 10^{9.5} <m_*的星系<m_*（\ rm m _ {\ rm m _ {\ rm m _ {\ odot}} $ 10^11.11。与以前的文献研究相比，我们扩展到更高的红移，包括更正常的星形星系（在主序列上），还研究了通过星形成和被动星系种群分裂气体质量分数的演变。我们发现我们的堆叠结果与文献中的扩展关系广泛一致。我们发现，在宇宙恒星形成历史的峰值之前，我们发现星系气体质量分数达到高峰的暂定证据。我们发现，与恒星形成人群相比，被动星系特别没有气体。我们发现，即使在高红移，高恒星质量星系仍然含有大量的气体。
We investigate the evolution of the gas mass fraction for galaxies in the COSMOS field using submillimetre emission from dust at 850$μ$m. We use stacking methodologies on the 850$μ$m S2COSMOS map to derive the gas mass fraction of galaxies out to high redshifts, 0 <= $z$ <= 5, for galaxies with stellar masses of $10^{9.5} < M_* (\rm M_{\odot}) < 10^{11.75}$. In comparison to previous literature studies we extend to higher redshifts, include more normal star-forming galaxies (on the main sequence), and also investigate the evolution of the gas mass fraction split by star-forming and passive galaxy populations. We find our stacking results broadly agree with scaling relations in the literature. We find tentative evidence for a peak in the gas mass fraction of galaxies at around $z$ ~ 2.5-3, just before the peak of the star formation history of the Universe. We find that passive galaxies are particularly devoid of gas, compared to the star-forming population. We find that even at high redshifts, high stellar mass galaxies still contain significant amounts of gas.
