The evolution of barred spiral galaxies in the Hubble Deep Fields North and South
The evolution of barred spiral galaxies in the Hubble Deep Fields North and South
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DOI：
10.1046/j.1365-8711.1999.02766.x
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发表时间：
1998-11
影响因子：
4.8
通讯作者：
R. Abraham;M. Merrifield;R. Ellis;N. Tanvir;J. B. I. O. Astronomy;U. Cambridge;S. O. PhysicsAstronomy;U. Nottingham;D. PhysicsAstronomy;U. Southampton
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文献类型：
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作者：
R. Abraham;M. Merrifield;R. Ellis;N. Tanvir;J. B. I. O. Astronomy;U. Cambridge;S. O. PhysicsAstronomy;U. Nottingham;D. PhysicsAstronomy;U. Southampton
棒旋星系的频率作为红移的函数包含了关于暗物质晕中恒星盘的引力影响的重要信息，并且还可以区分当代关于星系核球起源的理论。在本文中，我们提出了一种新的定量方法来确定棒螺旋结构的强度，并验证其对红移相关效应的鲁棒性。通过将来自哈勃深空北区的星系样本与来自哈勃深空南区的新可用数据相结合，我们能够定义 18 个客观定义的 I814W < 23.2 mag 的低倾角棒状螺旋系统的统计样本。分析作为红移函数的棒旋星系的比例，我们发现超过红移 z ≃ 0.5 时棒旋星系的比例显着下降。这种效应的物理意义尚不清楚，但几种可能性包括动态更热（或越来越暗物质主导）的高红移盘，或在高红移下棒破坏的效率提高。通过研究哈勃分类音叉“正交”轴的形成，我们的结果补充了早期-晚期序列演化的研究，并将观察到哈勃分类序列到位的红移推到了后来的时代。
The frequency of barred spiral galaxies as a function of redshift contains important information on the gravitational influence of stellar disks in their dark matter halos and also may distinguish between contemporary theories for the origin of galactic bulges. In this paper we present a new quantitative method for determining the strength of barred spiral structure, and verify its robustness to redshift-dependent effects. By combining galaxy samples from the Hubble Deep Field North with newly available data from the Hubble Deep Field South, we are able to define a statistical sample of 18 objectively-defined low-inclination barred spiral systems with I814W < 23.2 mag. Analysing the proportion of barred spiral galaxies seen as a function of redshift, we find a significant decline in the barred fraction beyond redshifts z ≃ 0.5. The physical significance of this effect remains unclear, but several possibilities include dynamically hotter (or increasingly dark-matter dominated) high-redshift discs, or an enhanced efficiency in bar destruction at high redshifts. By investigating the formation of the “orthogonal” axis of Hubble’s classification tuning fork, our result complements studies of evolution in the early–late sequence, and pushes to later epochs the redshift at which the Hubble classification sequence is observed to be in place.