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Deep Extragalactic VIsible Legacy Survey (DEVILS): SED fitting in the D10-COSMOS field and the evolution of the stellar mass function and SFR–M⋆ relation
Monthly Notices of the Royal Astronomical Society ( IF 4.7 ) Pub Date : 2021-05-06 , DOI: 10.1093/mnras/stab1294
Jessica E Thorne 1 , Aaron S G Robotham 1, 2 , Luke J M Davies 1 , Sabine Bellstedt 1 , Simon P Driver 1 , Matías Bravo 1 , Malcolm N Bremer 3 , Benne W Holwerda 4 , Andrew M Hopkins 5 , Claudia del P Lagos 1, 2 , Steven Phillipps 3 , Malgorzata Siudek 6, 7 , Edward N Taylor 8 , Angus H Wright 9
Affiliation  

We present catalogues of stellar masses, star formation rates (SFRs), and ancillary stellar population parameters for galaxies spanning 0 < z < 9 from the Deep Extragalactic VIsible Legacy Survey (DEVILS). DEVILS is a deep spectroscopic redshift survey with very high completeness, covering several premier deep fields including COSMOS (D10). Our stellar mass and SFR estimates are self-consistently derived using the spectral energy distribution (SED) modelling code ProSpect, using well-motivated parametrizations for dust attenuation, star formation histories, and metallicity evolution. We show how these improvements, and especially our physically motivated assumptions about metallicity evolution, have an appreciable systematic effect on the inferred stellar masses, at the level of ∼0.2 dex. To illustrate the scientific value of these data, we map the evolving galaxy stellar mass function (SMF) and the SFR–M⋆ relation for 0 < z < 4.25. In agreement with past studies, we find that most of the evolution in the SMF is driven by the characteristic density parameter, with little evolution in the characteristic mass and low-mass slopes. Where the SFR–M⋆ relation is indistinguishable from a power law at z > 2.6, we see evidence of a bend in the relation at low redshifts (z < 0.45). This suggests evolution in both the normalization and shape of the SFR–M⋆ relation since cosmic noon. It is significant that we only clearly see this bend when combining our new DEVILS measurements with consistently derived values for lower redshift galaxies from the Galaxy And Mass Assembly (GAMA) survey: this shows the power of having consistent treatment for galaxies at all redshifts.

中文翻译:

深河外可见遗产调查(DEVILS):D10-COSMOS场中的SED拟合以及恒星质量函数和SFR-M⋆关系的演变

我们提供了跨度为 0 < 的星系的恒星质量、恒星形成率 (SFR) 和辅助恒星群体参数的目录。z<9 来自深河外可见遗产调查 (DEVILS)。DEVILS 是一项深度光谱红移调查,具有非常高的完整性,涵盖了包括 COSMOS (D10) 在内的几个主要深场。我们的恒星质量和恒星形成率估计是使用光谱能量分布 (SED) 建模代码 ProSpect 自洽推导出的,使用动机良好的尘埃衰减、恒星形成历史和金属量演化的参数化。我们展示了这些改进,尤其是我们对金属丰度演化的物理动机假设,如何在 0.2 dex 水平上对推断的恒星质量产生明显的系统影响。为了说明这些数据的科学价值,我们绘制了演化中的星系恒星质量函数 (SMF) 和 SFR-M⋆ 关系,用于 0 <<; z<4.25。与过去的研究一致,我们发现 SMF 的大部分演变是由特征密度参数驱动的,特征质量和低质量斜率的演变很少。其中 SFR-M⋆ 关系与 z > 处的幂律无法区分;在图 2.6 中,我们看到在低红移 (z < 0.45) 时关系出现弯曲的证据。这表明自宇宙正午以来 SFR-M⋆ 关系的归一化和形状都发生了演变。重要的是,当我们将新的 DEVILS 测量结果与来自银河和质量大会 (GAMA) 调查的低红移星系的一致推导值相结合时,我们才能清楚地看到这个弯曲:
更新日期:2021-05-06
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