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arXiv 1102.3911astro-ph.COastro-ph.GA
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盘形镓的组装历史:I.用DEIMOS从深曝光得到z~1.3的Tully-Fisher关系

The Assembly History of Disk Galaxies: I - The Tully-Fisher Relation to z~1.3 from Deep Exposures with DEIMOS

Sarah H. Miller, Kevin Bundy, Mark Sullivan, Richard S. Ellis, Tommaso Treu

摘要:

基于Keck II望远镜上的DEIMOS光谱、多色HST ACS测光和地基KS波段成像,我们对129个z AB<22.5,红移范围0.2<z<1.3的盘状星系的恒星质量、光度和自转速度之间的演化标度关系提出了新的测量方法。我们的调查的一个独特的功能是延长光谱积分时间,从而显着改善确定每个星系的特征旋转速度。旋转曲线被可靠地追踪到半径,在那里它们开始变平,大约90%的样本,我们对HST分辨的凸起和盘组件进行建模,以便准确地对我们测量的速度进行去投影,考虑到视宁度和色散。我们证明了这些进步的优点,通过恢复的内在散射的恒星质量塔利-费舍尔关系的一个因素,2-3比以前的研究中,在中间的红移和可比的本地确定的关系。随着我们精度的提高,我们发现该关系在~1处得到了很好的建立<z>,没有显著的发展到<z>~0.3,\DeltaM_s tellar ~ 0.04+/-0.07 dex。在B波段Tully-Fisher关系中可以看到更清晰的演化趋势,对应于在相同的红移范围内以固定速度的光度下降\DeltaM_B ~ 0.85+/-0.28等,反映了这一时期恒星形成的变化。作为一个例子,可能的机会时,气体质量可用于样品,如我们的,我们展示了我们的动力学和恒星质量数据可以用来评估可能的贡献的重子和暗物质的组装历史的螺旋星系。

英文摘要:

We present new measures of the evolving scaling relations between stellar mass, luminosity and rotational velocity for a morphologically-inclusive sample of 129 disk-like galaxies with z_AB<22.5 in the redshift range 0.2<z<1.3, based on spectra from DEIMOS on the Keck II telescope, multi-color HST ACS photometry, and ground-based Ks-band imaging. A unique feature of our survey is the extended spectroscopic integration times, leading to significant improvements in determining characteristic rotational velocities for each galaxy. Rotation curves are reliably traced to the radius where they begin to flatten for ~90% of our sample, and we model the HST-resolved bulge and disk components in order to accurately de-project our measured velocities, accounting for seeing and dispersion. We demonstrate the merit of these advances by recovering an intrinsic scatter on the stellar mass Tully-Fisher relation a factor of 2-3 less than in previous studies at intermediate redshift and comparable to that of locally-determined relations. With our increased precision, we find the relation is well-established by <z>~1, with no significant evolution to <z>~0.3, \DeltaM_stellar ~ 0.04+/-0.07 dex. A clearer trend of evolution is seen in the B-band Tully-Fisher relation corresponding to a decline in luminosity of \DeltaM_B ~ 0.85+/-0.28 magnitudes at fixed velocity over the same redshift range, reflecting the changes in star formation over this period. As an illustration of the opportunities possible when gas masses are available for a sample such as ours, we show how our dynamical and stellar mass data can be used to evaluate the likely contributions of baryons and dark matter to the assembly history of spiral 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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