也许它们根本就不是球状星团

Highlights of Astronomy Pub Date : 2003-10-16 DOI:10.1017/S1539299600015677

A. Karick

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引用次数: 0

摘要

我们的2dF天炉座星系团光谱调查(FCSS)和对室女座星系团的后续研究表明，两个星系团的核心都包含了一种以前未知的天体——超紧凑矮星系(UCD)。我们提出了高分辨率光谱和深多色成像，以表明这些神秘的物体在动态上与球状星团(GCs)和有核矮星系(dE,Ns)不同。我们对它们起源的假设可以解释在中心星系团星系中观测到的高“比频率”。

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Perhaps They are not Globular Clusters After All

Our 2dF Fornax Cluster Spectroscopic Survey (FCSS) and follow-up work in the Virgo Cluster have shown that the cores of both galaxy clusters contain a previously-unknown class of object, ultra-compact dwarf (UCD) galaxies. We present high resolution spectroscopy and deep multicolor imaging to show that these enigmatic objects are dynamically distinct from both globular clusters (GCs) and nucleated dwarf galaxies (dE,Ns). Our hypothesis for their origin may explain the observed high “specific frequency” of GCs in central cluster galaxies.

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Highlights of Astronomy

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