Lockman--SpReSO项目：红外选恒星形成星系的主要性质
The Lockman--SpReSO project. Main properties of infrared selected star-forming galaxies
AI总结：
本研究通过Lockman--SpReSO项目的红外选样本，排除AGN后分析SFG的质量-恒星形成率关系、金属丰度演化及三维基本平面关系，发现高红移下的演化特征与红外选星系的金属丰度偏低等结果。
摘要：
方法：我们采用不同的选择标准，以获得活动星系核（AGN）污染最小的恒星形成星系（SFG）样本。使用多种方法估算这些SFG的内禀消光、恒星形成率（SFR）和气态金属丰度。结合已有文献中的研究结果，我们检验了SFR与恒星质量（$M_*$）之间的相关性，以及随$M_*$变化的金属丰度演化。最后，还研究了$M_*$、SFR和金属丰度之间的三维关系。结果：从Lockman--SpReSO星表中最初的409个远红外（FIR）选天体光谱样本中，识别并排除了69个（17%）AGN，这一比例几乎是局地研究中发现比例的两倍，最终得到340个SFG的样本。对$M_*$--SFR关系的分析显示，Lockman--SpReSO红外选SFG在红移$z>0.4$时表现出演化迹象，偏移到主序之上，平均偏移量约为0.4 dex。由于78%的星系属于这一类别，它们位于星暴星系区域内。此外，对于$\text{log } M_* (M_\bullet) \text{gtrsim } 10.5$的星系，未发现比恒星形成率（specific SFR）与红移的关系存在明显的平坦化。与以往研究中发表的光学选SFG的$M_*$--金属丰度关系（MZR）结果一致，但在分析MZR时发现，红外选SFG的金属丰度低于根据其$M_*$和红移所预期的数值。在研究三维$M_*$--SFR--金属丰度关系（基本平面FP）时，确定本研究样本与现有文献中的关系一致，平均弥散约为0.2 dex。不过，当使用从红外光度得到的SFR时，需要对FP进行重新校准，并且在这种情况下，对于$\text{log } M_* (M_\bullet) \text{gtrsim } 10.5$的星系，未观测到相关性的衰减。
英文摘要：
Methods.We applied distinct selection criteria to attain an SFG sample with minimal AGN contamination. Multiple approaches were used to estimate the intrinsic extinction, SFR and gas-phase metallicity for the SFGs. In conjunction with findings in the literature, we examined the correlation between SFRs and stellar masses ($M_*$), as well as the metallicity evolution depending on $M_*$. Finally, the 3D relationship between $M_*$, SFR and metallicity, is also studied.} Results. From the initial spectroscopic sample of 409 FIR-selected objects from the Lockman--SpReSO catalogue, 69 (17\%) AGNs have been identified and excluded, which is nearly double the percentage found in local studies, leaving a sample of 340 SFGs. The analysis of the $M_*$--SFR relationship revealed that Lockman--SpReSO IR-selected SFGs show signs of evolution at redshifts $z>0.4$, shifting above the main sequence, with a mean value of $\sim0.4$ dex. They are located within the starburst galaxy region since 78\% of the galaxies fall into this category. In addition, no evident flattening was found in the relation to specific SFR with redshift for $\log M_* (M_\odot) \gtrsim 10.5$. In line with the $M_*$--metallicity relation (MZR) outcomes published in previous studies for optically selected SFGs, however, during the analysis of the MZR, it was found that IR-selected SFGs exhibit lower metallicities than those anticipated on the basis of their $M_*$ and redshift. During the investigation of the 3D $M_*$--SFR--metallicity relation (FP), it was established that the research sample is consistent with relations in the existing literature, with an average scatter of $\sim0.2$ dex. However, a re-calibration of the FP when using the SFR obtained from the IR luminosity is required and, in this case, no attenuation in the correlation for $\log M_* (M_\odot) \gtrsim 10.5$ is observed.
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