S0s赝凸的SALT谱研究
A SALT Spectral Study of S0s Hosting Pseudobulges
摘要：
我们对Vaghmare等人（2015）建立的S 0星系样本进行了SALT-RSS光谱研究，使用光度标准组合具有伪凸起。我们提取的光谱沿星系主轴使用标准的长缝光谱还原程序和模型的光谱，使用星光详细恒星形成的历史。在我们的样本中没有酒吧的星系的中央光谱揭示了一个复杂的恒星形成的历史，这是一致的信念，pseudobulges有一个历史的恒星形成分布在很长一段时间。无棒星系的光谱中含有强的发射线，如H $α$，表明活跃的恒星形成，这似乎是在矛盾的预期，S 0星系已被剥离的气体。在样本中的两个棒星系的情况下，光谱主要是来自一个更古老的恒星星族的光。这似乎表明，由于杆的作用，伪隆起的形成加速了。其中一个星系似乎已经耗尽了它的气体储存，因此没有最近形成的恒星群的迹象，而另一个星系则通过最近的漏斗作用成功地产生了新的恒星。我们还利用SDSS的替代样本证实了棒对赝核球中恒星星族性质的影响
英文摘要：
We present a SALT-RSS spectroscopic study of a sample of S0 galaxies established by Vaghmare et al. (2015) as having pseudobulges using a combination of photometric criteria. We extract the spectra of various regions along the galaxy major axis using standard long-slit spectroscopic reduction procedures and model the spectra using STARLIGHT to derive detailed star formation histories. The central spectra of galaxies without bars in our sample reveal a complex star formation history, which is consistent with the belief that pseudobulges have a history of star formation distributed over extended periods of time. The spectra of the unbarred galaxies contain strong emission lines such as H $α$, indicating active star formation, which appears to be in contradiction with the expectation that S0 galaxies have been stripped of gas. In the case of the two barred galaxies in the sample, the spectrum is dominated by light from a much older stellar population. This seems to suggest an accelerated formation of the pseudobulge made possible by the action of the bar. One of these galaxies appears to have exhausted its reservoir of gas and thus has no signature of a recently formed population of stars while the other galaxy has managed to give rise to new stars through a recent funnelling action. We have also confirmed the influence of bars on the nature of the stellar population in a pseudobulge using an alternate sample based on the SDSS
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