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arXiv 1503.07635astro-ph.GAastro-ph.CO
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螺旋半导体作为赝凸宿主S0s的先驱体

Spiral Galaxies as Progenitors of Pseudobulge Hosting S0s

Kaustubh Vaghmare, Sudhanshu Barway, Smita Mathur, Ajit K. Kembhavi

摘要:

我们目前的观测pseudobulges在S0和旋涡星系使用的成像数据与斯皮策红阵列相机。我们用二维球盘棒分解方法测定了185个S0星系和31个邻近旋涡星系的结构参数。利用Sersic指数和在Kormendy图上的位置将它们的凸起分为经典的或假的,我们发现25个S0(14%)和24个螺旋(77%)主机pseudoblges。我们在旋涡星系中发现的pseudobulges的分数是一致的,与以前的结果与光学数据,并表明大部分的螺旋的演变是由长期的过程,而不是由主要的合并。我们发现,凸起的有效半径与磁盘尺度长度的伪凸起的S0s和螺旋,预期长期形成的凸起磁盘不稳定性,虽然在S0s的磁盘显着小于那些在螺旋。我们发现,早期型pseudobull托管螺旋可以转化为pseudobull托管S0的简单的气体剥离。然而,简单的气体剥离机制是不足以将晚型pseudobull托管螺旋到pseudobull托管S0。

英文摘要:

We present observations of pseudobulges in S0 and spiral galaxies using imaging data taken with the Spitzer Infra-Red Array Camera. We have used 2-d bulge-disk-bar decomposition to determine structural parameters of 185 S0 galaxies and 31 nearby spiral galaxies. Using the Sersic index and the position on the Kormendy diagram to classify their bulges as either classical or pseudo, we find that 25 S0s (14%) and 24 spirals (77%) host pseudoblges. The fraction of pseudobulges we find in spiral galaxies is consistent with previous results obtained with optical data and show that the evolution of a large fraction of spirals is governed by secular processes rather than by major mergers. We find that the bulge effective radius is correlated with the disk scale length for pseudobulges of S0s and spirals, as expected for secular formation of bulges from disk instabilities, though the disks in S0s are significantly smaller than those in spirals. We show that early-type pseudobulge hosting spirals can transform to pseudobulge hosting S0s by simple gas stripping. However, simple gas stripping mechanism is not sufficient to transform the late-type pseudobulge hosting spirals into pseudobulge hosting S0s.

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