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arXiv 0912.4579astro-ph.COastro-ph.GA
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1.0 < z < 1.5恒星形成星系的二维运动学和物理性质

2D Kinematics and physical properties of 1.0 < z < 1.5 star-forming galaxies

M. Lemoine-Busserolle, F. Lamareille

摘要:

我们结合了近红外积分场光谱学和宽带光度学获得的Halpha发射的二维运动学和形态学信息,研究了10个晚型星系样本在1.0 < z < 1.5时的动力学结构和物理性质。样本显示了一系列的运动学类型,其中包括一个合并,一个面对星系,和八个物体显示旋转的证据。在这八个天体中,有一半是旋转主导的星系,而其余的则是分散主导的星系。我们还发现,两个星系的旋转主导的星系是纯旋转支持的磁盘。它们在0.5-1千秒差距内达到最大速度约180-290公里/秒,类似于具有薄盘的局部螺旋。我们样本中的星系具有相对年轻的恒星星族(< 1.5 Gyr),恒星质量范围为0.6-5 × 10^10 Msun。此外,它们中的大多数还没有将大部分气体转化为恒星(6个星系的气体比例> 50%)。因此,那些已经有稳定盘的星系,其最终的恒星质量可能与现在的螺旋星系相似,这些旋转系统可以被看作是螺旋星系的前身。我们通过研究1.2 < z < 1.5时的恒星质量Tully-Fisher关系来结束我们的研究。

英文摘要:

We combined two-dimensional kinematic and morphology information on the Halpha emission, obtained using near-infrared integral field spectroscopy, with broad-band photometry to investigate the dynamical structure and the physical properties of a sample of ten late-type galaxies at 1.0 < z < 1.5. The sample displays a range of kinematical types which include one merger, one face-on galaxy, and eight objects showing evidence of rotation. Among these eight objects, half are rotation-dominated galaxies, while the rest are dispersion-dominated. We found also that two galaxies out of the rotation-dominated galaxies are pure rotationally supported disks. They achieve a maximum velocity of ~180-290 km/s within ~0.5-1 kpc, similar to local spirals with thin disks. The galaxies of our sample have relatively young stellar populations (< 1.5 Gyr) and possess a range of stellar mass of 0.6-5 X10^10 Msun. In addition, most of them have not yet converted the majority of their gas into stars (six galaxies have their gas fraction >50 per cent). Therefore, those of them which already have a stable disk will probably have their final stellar mass similar to the present-day spirals, to which these rotating systems can be seen as precursors. We conclude our study by investigating the stellar mass Tully-Fisher relation at 1.2 < z < 1.5.

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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