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arXiv 1306.1583astro-ph.CO
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星系和质量组装(GAMA):对质量、金属丰度和SFR关系的更深入的看法

Galaxy And Mass Assembly (GAMA): A deeper view of the mass, metallicity, and SFR relationships

M. A. Lara-Lopez, A. M. Hopkins, A. R. Lopez-Sanchez, S. Brough, M. L. P. Gunawardhana, M. Colless, A. S. G. Robotham, A. E. Bauer, J. Bland-Hawthorn, M. Cluver… 展开作者

M. A. Lara-Lopez, A. M. Hopkins, A. R. Lopez-Sanchez, S. Brough, M. L. P. Gunawardhana, M. Colless, A. S. G. Robotham, A. E. Bauer, J. Bland-Hawthorn, M. Cluver, S. Driver, C. Foster, L. S. Kelvin, J. Liske, J. Loveday, M. S. Owers, T. J. Ponman, R. G. Sharp, O. Steele, E. N. Taylor, D. Thomas

摘要:

充分理解气体金属丰度(Z)、恒星形成率(SFR)和恒星质量所起的作用是理解星系如何形成和演化的基础。这三个参数在不同红移下的关系对星系演化有重要影响,从而为星系演化模型提供了重要的约束条件。利用斯隆数字巡天数据发布7(SDSS-DR 7)和星系和质量大会(GAMA)调查的数据,我们研究了SFR,Z和恒星质量之间的关系和依赖关系,以及恒星形成星系的基本面。我们结合这两个调查使用体积有限的样本z ~ 0.36的红移。GAMA和SDSS调查在分析SFR、Mass和Z之间的关系时相互补充。我们提出的证据SFR和金属丰度演化到z ~ 0.2。我们研究了SFR,质量,Z和特定恒星形成率(SSFR)对M-Z,M-SFR,M-SSFR,Z-SFR和Z-SSFR关系的依赖关系,发现所有这些之间都存在很强的相关性。基于这些依赖关系,我们提出了一个简单的模型,使我们能够解释低质量和高质量星系之间观察到的不同行为。最后,我们的分析使我们能够确认一个基本平面的存在,在恒星形成星系中质量=f(Z,SFR)。

英文摘要:

A full appreciation of the role played by gas metallicity (Z), star-formation rate (SFR), and stellar mass is fundamental to understanding how galaxies form and evolve. The connections between these three parameters at different redshifts significantly affect galaxy evolution, and thus provide important constraints for galaxy evolution models. Using data from the Sloan Digital Sky Survey-Data Release 7 (SDSS-DR7) and the Galaxy and Mass Assembly (GAMA) surveys we study the relationships and dependencies between SFR, Z, and stellar mass, as well as the Fundamental Plane for star-forming galaxies. We combine both surveys using volume-limited samples up to a redshift of z ~ 0.36. The GAMA and SDSS surveys complement each other when analyzing the relationships between SFR, Mass and Z. We present evidence for SFR and metallicity evolution to z ~ 0.2. We study the dependencies between SFR, Mass, Z, and specific star-formation rate (SSFR) on the M-Z, M-SFR, M-SSFR, Z-SFR, and Z-SSFR relations, finding strong correlations between all. Based on those dependencies, we propose a simple model that allows us to explain the different behaviour observed between low and high mass galaxies. Finally, our analysis allows us to confirm the existence of a Fundamental Plane, for which Mass=f(Z, SFR) in star-forming galaxies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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