arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1703.04321astro-ph.GA
收藏

用KMOS ^3D研究Tully-Fisher关系在z~2.3和z~0.9之间的演化

The evolution of the Tully-Fisher relation between z~2.3 and z~0.9 with KMOS^3D

H. Übler, N. M. Förster Schreiber, R. Genzel, E. Wisnioski, S. Wuyts, P. Lang, T. Naab, A. Burkert, L. J. Tacconi, D. J. Wilman, M. Fossati, J. T. Mendel, A. Be… 展开作者

H. Übler, N. M. Förster Schreiber, R. Genzel, E. Wisnioski, S. Wuyts, P. Lang, T. Naab, A. Burkert, L. J. Tacconi, D. J. Wilman, M. Fossati, J. T. Mendel, A. Beifiori, S. Belli, R. Bender, G. Brammer, J. Chan, R. Davies, M. Fabricius, A. Galametz, D. Lutz, I. Momcheva, E. J. Nelson, R. P. Saglia, S. Seitz, K. Tadaki, P. G. van Dokkum

摘要:

作为KMOS ^3D积分场光谱巡天的一部分,我们研究了红移z~2.3和z~0.9的大质量恒星形成盘星系的恒星质量和重子质量Tully-Fisher关系(TFR)。我们的空间分辨数据允许对单个星系进行可靠的建模,包括压力支持对推断的引力势的影响。在固定的圆速度,我们发现更高的重子质量和类似的恒星质量在z~2.3相比,z~0.9。随着红移的减小,气体与恒星的质量比也在减小,这意味着在星系尺度上,暗物质对动力学质量的贡献随着红移的减小而增加。与定域关系的比较表明,恒星和重子TFR零点从z=0到z~0.9呈现负演化,恒星TFR零点从z~0.9到z~2.3没有演化,重子TFR零点从z~0.9到z~2.3呈现正演化。我们讨论了一个玩具模型的盘星系的演化来解释所观察到的,非单调的TFR的演变,考虑到经验激励的红移星系气体分数的依赖关系,和相对数量的重子星系和晕尺度上的暗物质。

英文摘要:

We investigate the stellar mass and baryonic mass Tully-Fisher relations (TFRs) of massive star-forming disk galaxies at redshift z~2.3 and z~0.9 as part of the KMOS^3D integral field spectroscopy survey. Our spatially resolved data allow reliable modelling of individual galaxies, including the effect of pressure support on the inferred gravitational potential. At fixed circular velocity, we find higher baryonic masses and similar stellar masses at z~2.3 as compared to z~0.9. Together with the decreasing gas-to-stellar mass ratios with decreasing redshift, this implies that the contribution of dark matter to the dynamical mass at the galaxy scale increases towards lower redshift. A comparison to local relations reveals a negative evolution of the stellar and baryonic TFR zero-points from z=0 to z~0.9, no evolution of the stellar TFR zero-point from z~0.9 to z~2.3, and a positive evolution of the baryonic TFR zero-point from z~0.9 to z~2.3. We discuss a toy model of disk galaxy evolution to explain the observed, non-monotonic TFR evolution, taking into account the empirically motivated redshift dependencies of galactic gas fractions, and of the relative amount of baryons to dark matter on galaxy and halo scales.

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。

↑