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首页> 外文期刊>The Astrophysical Journal. Letters >A Spitzer study of pseudobulges in S0 galaxies: Secular evolution of disks
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A Spitzer study of pseudobulges in S0 galaxies: Secular evolution of disks

机译：Spitzer研究S0星系中的假凸起：盘的长期演化

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摘要

In this Letter, we present a systematic study of lenticular (S0) galaxies based on mid-infrared imaging data on 185 objects taken using the Spitzer Infrared Array Camera. We identify the S0s hosting pseudobulges based on the position of the bulge on the Kormendy diagram and the Sérsic index of the bulge. We find that pseudobulges preferentially occur in the fainter luminosity class (defined as having total K-band absolute magnitude MK fainter than -22.66 in the AB system). We present relations between bulge and disk parameters obtained as a function of the bulge type. The disks in the pseudobulge hosting galaxies are found to have distinct trends on the r e-r d and μd(0)-r d correlations compared to those in galaxies with classical bulges. We show that the disks of pseudobulge hosts possess on average a smaller scale length and have a fainter central surface brightness than their counterparts occurring in classical bulge hosting galaxies. The differences found for discs in pseudobulge and classical bulge hosting galaxies may be a consequence of the different processes creating the central mass concentrations.
机译：在这封信中，我们基于使用Spitzer红外阵列相机拍摄的185个物体的中红外成像数据，对透镜状（S0）星系进行了系统研究。我们根据Kormendy图上凸出的位置和凸出的Sérsic索引来确定承载伪凸的S0。我们发现伪凸起优先出现在较弱的发光度类别中（定义为在AB系统中总K波段绝对幅度MK比-22.66弱）。我们介绍了凸出和根据凸出类型获得的磁盘参数之间的关系。与具有典型凸起的星系相比，伪凸起的星系中的圆盘在r e-r d和μd（0）-r d相关性上具有明显的趋势。我们显示，伪凸出主机的磁盘平均比其在经典凸出主机星系中出现的对应磁盘具有较小的标度长度，并且具有较弱的中心表面亮度。在伪隆起星系和经典隆起星系中发现的圆盘差异可能是产生中心质量浓度的不同过程的结果。

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