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arXiv 2008.13131astro-ph.GA
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环境对COSMOS场中恒星形成活动和恒星质量的影响

Effect of the environment on star formation activity and stellar mass for star-forming galaxies in the COSMOS field

S. M. Randriamampandry, M. Vaccari, K. M. Hess

摘要:

我们研究了环境与星系主序星的关系(恒星质量与恒星形成率的关系)以及环境与射电光度(P $_{\rm 1.4GHz}$)的关系,以期对环境对星系的影响有新的认识。我们使用的VLA-COSMOS 3 GHz目录,包括恒星形成星系(SFGs)和静止星系(AGN)在三个不同的环境(场,灯丝,集群)和三种不同的星系类型(卫星,中央,孤立)。我们第一次进行比较分析的SFG的分布相对于主序列(MS)的共识区域从文献中,考虑到星系环境和使用无线电观测在0.1 $\leq$ z $\leq$ 1.2。我们的研究结果证实,SFR下降与宇宙的时间是一致的文献。我们发现,MS的斜率为不同的$z$和M $_{*}$箱是浅于MS的共识,逐步向更高的红移箱的演变,无论环境。考虑到大的误差,我们没有看到环境和星系类型的SFR趋势。此外,我们注意到,环境似乎不是我们的样品在高恒星质量下MS平坦化的原因。

英文摘要:

We investigate the relationship between environment and the galaxy main sequence (the relationship between stellar mass and star formation rate) and also the relationship between environment and radio luminosity (P$_{\rm 1.4GHz}$) to shed new light on the effects of the environments on galaxies. We use the VLA-COSMOS 3 GHz catalogue that consists of star-forming galaxies (SFGs) and quiescent galaxies (AGN) in three different environments (field, filament, cluster) and for three different galaxy types (satellite, central, isolated). We perform for the first time a comparative analysis of the distribution of SFGs with respect to the main sequence (MS) consensus region from the literature, taking into account galaxy environment and using radio observations at 0.1 $\leq$ z $\leq$ 1.2. Our results corroborate that SFR is declining with cosmic time which is consistent with the literature. We find that the slope of the MS for different $z$ and M$_{*}$ bins is shallower than the MS consensus with a gradual evolution towards higher redshift bins, irrespective of environments. We see no SFR trends on both environments and galaxy type given the large errors. In addition, we note that the environment does not seem to be the cause of the flattening of MS at high stellar masses for our sample.

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