Is There a Deficit of S0 Galaxies at Intermediate Redshift?
Is There a Deficit of S0 Galaxies at Intermediate Redshift?
复制标题
S0 星系在中红移处是否存在缺陷？
DOI：
10.1086/305853
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
S. Andreon
中科院分区：
文献类型：
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作者：
S. Andreon
最近的文献中存在关于 SO 星系演化的两个相互矛盾的结果：要么 S0 很古老（zformation > 2）并且正在被动演化，要么大多数在 z < 0.5 时形成，正如中间红移（z ~ 0.5）星团中 S0 的不足所暗示的那样。这一争议的解决方案可能是，S0 的明显缺陷源自一个容易出现形态分类错误的量（E 与 S0 的比率）。一旦考虑到所有误差源，不同红移处星团的 E 与 S0 比率就完全兼容，并且数据不需要在 z < 0.5 处额外创建 S0。此外，中间红移星团中的 S0 完全不存在缺陷，对于该星团，我们具有非常高质量的形态类型，因此可以得出误差较小的 E 与 S0 比率。
Two contradictory results on the evolution of SO galaxies now exist in the recent literature: either S0's are old (zformation > 2) and are evolving passively or most of them form at z < 0.5, as implied by the deficit of S0's in intermediate-redshift (z ~ 0.5) clusters. The resolution of this controversy may be that the apparent deficit of S0's has been derived from a quantity—the E-to-S0 ratio—that is prone to morphological classification errors. Once all sources of error are taken into account, the E-to-S0 ratios of clusters at different redshifts are fully compatible, and no additional creation of S0's at z < 0.5 is required by the data. Furthermore, there is no deficit at all of S0's in the intermediate-redshift cluster for which we have morphological types of very high quality and thus derive an E-to-S0 ratio with a small error.