arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1202.6236astro-ph.CO
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LIRGs的中心区域:环,隐藏的星暴,超新星和星团

Central regions of LIRGs: rings, hidden starbursts, Supernovae and star clusters

Petri Vaisanen, Andres Escala, Erkki Kankare, Jari Kotilainen, Seppo Mattila, Vinesh Rajpaul, Zara Randriamanakoto, Juha Reunanen, Stuart Ryder, Albert Zijlstra

摘要:

我们研究恒星形成(SF)在非常活跃的环境中,在明亮的红外星系,这往往是相互作用。各种现象被检测到,如中央星爆,环核SF,模糊的SNe跟踪最近SF的历史,大规模的超级星团,和网站的强离核SF。所有这些都可以最终用于定义恒星形成的触发和传播顺序,以及在富含气体的星系相互作用和合并的生命中与核活动的相互作用。在本文中,我们提出了高空间分辨率的积分场光谱分析的中心区域的两个相互作用的LIRG。我们探测到一个核3.3 μ m PAH环周围的核心NGC 1614与热红外IFU的意见。环的特点和关系的重组线检测到的强大的恒星形成环,以及一个向外扩张的星爆可能开始与(未成年人)的伴侣内检测到的潮汐功能的情况。然后,我们提出了IRAS 19115-2124的近红外IFU观测,又名鸟,这是一个有趣的三重相遇。第三个组成部分是次要的,但是,尽管如此,是整个系统的SFR的3/4的来源。在核的位置处检测气体流入和流出。最后,我们简要报告了我们正在进行的近红外自适应光学成像调查的几十LIRG。我们已经检测到高度模糊的核心崩溃SNE在中央KPC,并讨论了由于尘埃灭绝的“失踪SNE”的统计数据。我们还确定了LIRGs核心区域及其周围数百个超级星团的特征,作为宿主星系属性的函数。

英文摘要:

We study star formation (SF) in very active environments, in luminous IR galaxies, which are often interacting. A variety of phenomena are detected, such as central starbursts, circumnuclear SF, obscured SNe tracing the history of recent SF, massive super star clusters, and sites of strong off-nuclear SF. All of these can be ultimately used to define the sequence of triggering and propagation of star-formation and interplay with nuclear activity in the lives of gas rich galaxy interactions and mergers. In this paper we present analysis of high-spatial resolution integral field spectroscopy of central regions of two interacting LIRGs. We detect a nuclear 3.3 um PAH ring around the core of NGC 1614 with thermal-IR IFU observations. The ring's characteristics and relation to the strong star-forming ring detected in recombination lines are presented, as well as a scenario of an outward expanding starburst likely initiated with a (minor) companion detected within a tidal feature. We then present NIR IFU observations of IRAS 19115-2124, aka the Bird, which is an intriguing triple encounter. The third component is a minor one, but, nevertheless, is the source of 3/4 of the SFR of the whole system. Gas inflows and outflows are detected at the locations of the nuclei. Finally, we briefly report on our on-going NIR adaptive optics imaging survey of several dozen LIRGs. We have detected highly obscured core-collapse SNe in the central kpc, and discuss the statistics of "missing SNe" due to dust extinction. We are also determining the characteristics of hundreds of super star clusters in and around the core regions of LIRGs, as a function of host-galaxy properties.

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