arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0806.4269astro-ph
收藏

具有核塌缩超新星的早型星系

Early-type galaxies with core collapse supernovae

A. A. Hakobyan, A. R. Petrosian, B. McLean, D. Kunth, R. J. Allen, M. Turatto, R. Barbon

摘要:

人们普遍认为,核心坍缩SNe的祖先是年轻的大质量恒星,因此它们的宿主星系大多是由年轻的恒星星族控制的螺旋星系或不规则星系。令人惊讶的是,在形态分类的主机核心坍缩SNe,我们发现22例主机已被归类为椭圆或S0星系。为了澄清这一明显的矛盾,我们进行了详细的形态学研究和广泛的文献检索的样本对象的额外信息。我们的研究结果如下:1.在22个“早期类型”天体中,17个实际上是错误分类的螺旋星系,一个是错误分类的不规则星系,一个是错误分类的环形星系。2.在维持早期类型分类的3个天体中,一个(NGC 2768)是疑似合并残留物,另一个(NGC 4589)是肯定的合并,第三个(NGC 2274)是密切相互作用的。因此,在这些星系中存在一定数量的年轻恒星星族并不意外。这些结果证实了存在一个有限的,但显着的,数量的核心崩溃SNe在星系一般归类为早期类型。无论如何,在所有情况下,都有独立的指标表明,由于合并或引力相互作用,宿主星系中存在最近的恒星形成。

英文摘要:

It is widely accepted that the progenitors of core collapse SNe are young massive stars and therefore their host galaxies are mostly spiral or irregular galaxies dominated by a young stellar population. Surprisingly, among morphologically classified hosts of core collapse SNe, we find 22 cases where the host has been classified as an Elliptical or S0 galaxy. To clarify this apparent contradiction, we carry out a detailed morphological study and an extensive literature search for additional information on the sample objects. Our results are as follows: 1. Of 22 "early type" objects, 17 are in fact misclassified spiral galaxies, one is a misclassified irregular, and one is a misclassified ring galaxy. 2. Of the 3 objects maintaining the early type classification, one (NGC2768) is a suspected merger remnant, another (NGC4589) is definitely a merger, and the third (NGC2274) is in close interaction. The presence of some amount of young stellar population in these galaxies is therefore not unexpected. These results confirm the presence of a limited, but significant, number of core collapse SNe in galaxies generally classified of early type. In all cases, anyway, there are independent indicators of the presence in host galaxies of recent star formation due to merging or gravitational interaction.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑