论文标题
卡内基 - 艾尔文银河调查。 X.基于恒星质量的缩放关系凸起
The Carnegie-Irvine Galaxy Survey. X. Bulges in Stellar Mass-based Scaling Relations
论文作者
论文摘要
我们测量来自卡内基 - 艾尔文星系调查的312个磁盘星系凸起的光学颜色，并将其先前可用的$ r $ band结构参数转换为出色的质量参数。我们还测量了中央1 kpc中的平均恒星质量表面密度（$σ_{1} $）。将基于质量的Kormendy关系与基于通量的原始关系进行比较，我们发现大多数分类为经典和伪凸起及其整体统计特性基本上保持不变。虽然Kormendy关系的凸起类型分类对出色的种群效应具有鲁棒性，但基于群众的分类标准确实在凸起的结构特性及其恒星种群之间产生了更好的一致性。此外，基于群众的Kormendy关系揭示了类似于高$ z $紧凑型早期型星系的超密集凸起人群，否则它们隐藏在原始的Kormendy关系中。这些凸起可能是在早期宇宙中组装的球体的遗物，尽管对于某些人来说，我们不能排除世俗增长的某些贡献。我们证实了以前的研究，$σ_1$与凸出表面密度息息相关。
We measure optical colors for the bulges of 312 disk galaxies from the Carnegie-Irvine Galaxy Survey and convert their previously available $R$-band structural parameters to stellar mass parameters. We also measure their average stellar mass surface density in the central 1 kpc ($Σ_{1}$). Comparing the mass-based Kormendy relation with the original one based on flux, we find that the majority of the classifications into classical and pseudo bulges, as well as their overall statistical properties, remain essentially unchanged. While the bulge type classifications of the Kormendy relation are robust against stellar population effects, the mass-based classification criteria do produce better agreement between bulge structural properties and their stellar populations. Moreover, the mass-based Kormendy relation reveals a population of ultra-dense bulges akin to high-$z$ compact early-type galaxies, which are otherwise hidden in the original Kormendy relation. These bulges are probably relics of spheroids assembled in the early Universe, although for some we cannot rule out some contribution from secular growth. We confirm previous studies that $Σ_1$ correlates well with bulge surface densities.
