arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0901.3676astro-ph.CO
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z=1.3时光学Tully-Fisher关系的演化

Evolution of the optical Tully-Fisher relation up to z=1.3

M. Fernández Lorenzo, J. Cepa, A. Bongiovanni, H. Castañeda, A. M. Pérez García, M. A. Lara-López, M. Pović, M. Sánchez-Portal

摘要:

Tully-Fisher关系的演化研究在过去的几年里一直是有争议的。主要的困难在于确定中高红移星系所需的参数。这项工作的目的是确定的Tully-Fisher关系在高红移使用光学发射线的研究的主要问题,为了得出结论,这种关系在B,R和I带的可能演变。为了达到这个目的,我们比较了使用DEEP 2光谱从不同的光学谱线宽度得到的旋转速度。形态已确定通过HST图像,使用和比较不同的方法。仪器星等,然后校正K和消光和绝对星等的和谐宇宙学模型。最后,导出了在z = 1.3以下的不同红移下B,R和I带的光学Tully-Fisher关系。虽然大多数研究(包括本研究)都找到了演化的证据,但结果还不够确凿,因为可能的光度演化是在关系的散射范围内,而斜率的演化很难确定,因为在高红移时,只有最亮的星系才能被测量。尽管如此,我们的研究显示了一个明显的趋势,这是相同的所有波段的研究,有利于光度的演变,星系在过去更明亮的相同的旋转速度。这一结果也意味着塔利-费舍尔关系的颜色不随红移而改变,支持了盘状星系形成的坍缩模型与吸积模型。

英文摘要:

The study of the evolution of the Tully-Fisher relation has been controversial in the past years. The main difficulty is in determining the required parameters for intermediate and high redshift galaxies. This work aims to identify the main problems of the study of the Tully-Fisher relation at high redshift using optical emission lines, in order to draw conclusions about the possible evolution of this relation in the B, R, and I-bands. With this aim, the rotational velocities obtained from the widths of different optical lines using DEEP2 spectra are compared. Morphology has been determined via HST images, using and comparing different methodologies. Instrumental magnitudes are then corrected for K and extinction and the absolute magnitudes derived for the concordance cosmological model. Finally, the optical Tully-Fisher relations in B, R, and I-bands at different redshifts up to z = 1.3 are derived. Although most studies (this one included) find evidence of evolution, the results are not conclusive enough, since the possible luminosity evolution is within the scattering of the relation, and the evolution in slope is difficult to determine because at high redshift only the brightest galaxies can be measured. Nevertheless, our study shows a clear tendency, which is the same for all bands studied, that favours a luminosity evolution where galaxies were brighter in the past for the same rotation velocity. This result also implies that the colour of the Tully-Fisher relation does not change with redshift, supporting the collapse model versus the accretion model of disc galaxy formation.

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