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arXiv 1202.3107astro-ph.CO
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MASSIV:在VVDS中与SINFONI进行大规模装配调查。IV。1<z< 1.6时恒星形成星系的基本关系

MASSIV: Mass Assembly Survey with SINFONI in VVDS. IV. Fundamental relations of star-forming galaxies at 1<z< 1.6

D. Vergani, B. Epinat, T. Contini, L. Tasca, L. Tresse, P. Amram, B. Garilli, M. Kissler-Patig, O. Le Fevre, J. Moultaka, L. Paioro, J. Queyrel, C. Lopez-Sanjuan

摘要:

星系中的质量聚集是如何发生的,以及哪些过程促成了这种活动,是星系形成理论中争论最激烈的问题之一。这激发了我们的调查MASSIV的0.9<z<1.9恒星形成星系选择从纯粹的通量限制VVDS红移调查。对于第一次,我们推导出星系的大小,质量和内部速度之间的关系,重子塔利-费舍尔关系,从一个统计上有代表性的恒星形成星系的样本。我们发现一个动力学质量,同意与旋转星系的气体分数的~ 20%,完全符合使用Kennicutt-Schmidt公式和预期的演变派生的内容。非旋转星系的恒星成分尺寸更紧凑,质量比旋转星系小,但它们的气体成分尺寸在统计上没有差异。我们测量的大小恒星的质量和大小速度的关系,其中光盘均匀地成为更小的宇宙时间在固定的恒星质量或速度,并在一个给定的速度比在当地的宇宙质量较小的边缘演变。当我们引入S 05指数时,Tully-Fisher关系中的散射较小,我们将其解释为湍流运动对星系运动学的贡献随宇宙时间增加的证据。我们报告了一个持续的大散射的旋转在我们的关系,我们建议是内在的,并可能造成复杂的物理机制在我们的恒星质量/光度制度和红移范围内的工作。我们的研究结果一致指向一个温和的,净演化的这些关系,相当于那些由宇宙学模拟的磁盘形成至少8 Gyr和暗晕强烈耦合银河系分光光度特性的预测。

英文摘要:

How mass assembly occurs in galaxies and which process(es) contribute to this activity are among the most highly debated questions in galaxy formation theories. This has motivated our survey MASSIV of 0.9<z<1.9 star-forming galaxies selected from the purely flux-limited VVDS redshift survey. For the first time, we derive the relations between galaxy size, mass, and internal velocity, and the baryonic Tully-Fisher relation, from a statistically representative sample of star-forming galaxies. We find a dynamical mass that agrees with those of rotating galaxies containing a gas fraction of ~20%, perfectly consistent with the content derived using the Kennicutt-Schmidt formulation and the expected evolution. Non-rotating galaxies have more compact sizes for their stellar component, and are less massive than rotators, but do not have statistically different sizes for their gas-component. We measure a marginal evolution in the size-stellar mass and size-velocity relations in which discs become evenly smaller with cosmic time at fixed stellar mass or velocity, and are less massive at a given velocity than in the local Universe. The scatter in the Tully-Fisher relation is smaller when we introduce the S05 index, which we interpret as evidence of an increase in the contribution to galactic kinematics of turbulent motions with cosmic time. We report a persistently large scatter for rotators in our relations, that we suggest is intrinsic, and possibly caused by complex physical mechanism(s) at work in our stellar mass/luminosity regime and redshift range. Our results consistently point towards a mild, net evolution of these relations, comparable to those predicted by cosmological simulations of disc formation for at least 8Gyr and a dark halo strongly coupled with galactic spectrophotometric properties.

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