Dim view of past clashes

Curtis Struck

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Dim view of past clashes

机译：过去冲突的朦胧观点

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Simulations indicate that faint galaxies of a seemingly tranquil class were born in violent cosmic encounters. This would be good news for the prevailing model of how the Universe is constructed. Giant low-surface-brightness galaxies, or GLSBs, are gentle giants of the cosmos. Their gaseous disks are up to 100 kiloparsecs across, several times the size of our Milky Way, yet rates of star formation within them are very low. This makes them difficult to spot: the prototypical GLSB, Malin 1, was found only in 1986, despite being, at that time, the largest spiral galaxy ever seen. But GLSBs are not just troublesome to observe: their existence is also a challenge for the prevailing cold dark matter' (CDM) model of the Universes composition. Writing in Monthly Notices of the Royal Astronomical Society, Mapelli et al. now propose an origin for these perplexing galaxies that might circumvent that difficulty.

机译：模拟表明，看似平静的类的微弱星系是在剧烈的宇宙相遇中诞生的。对于普遍构造宇宙的模型而言，这将是个好消息。巨大的低表面亮度星系，即GLSB，是宇宙的温和巨星。它们的气碟跨度高达100千帕秒，是我们银河系的几倍，但其中的恒星形成率却非常低。这使得它们很难被发现：原型GLSB Malin 1直到1986年才被发现，尽管当时是有史以来最大的旋涡星系。但是，GLSB不仅观察起来很麻烦：它们的存在对于宇宙成分普遍存在的冷暗物质（CDM）模型也是一个挑战。 Mapelli等人在《皇家天文学会月报》中撰写。现在为这些令人困惑的星系提出一个起源，可能会避免这一难题。

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《Nature》 |2007年第7172期|956-957|共2页
作者
Curtis Struck;
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作者单位

Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种 eng
中图分类自然科学总论;
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Dim view of past clashes

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