A Hubble Space Telescope WFPC2 Investigation of the Nuclear Morphology in the Toomre Sequence of Merging Galaxies
A Hubble Space Telescope WFPC2 Investigation of the Nuclear Morphology in the Toomre Sequence of Merging Galaxies
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哈勃太空望远镜 WFPC2 对合并星系托姆雷序列核形态的研究
DOI：
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发表时间：
2003
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影响因子：
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通讯作者：
A. Uof
中科院分区：
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作者：
S. Laine;R. V. D. Marel;J. Rossa;T. Boeker;J. C. Mihos;J. Hibbard;A. I. Z. S. S. C. S. C. N. Obs.;A. Uof
根据哈勃太空望远镜WFPC2相机收集的成像数据，我们报道了合并星系图莫尔序列中核区域的特性。我们在F555W和F814W宽带滤波器以及Hα+[N II]窄带滤波器中对11个系统进行了演化合并序列的成像。核区的宽频带形态从无核的星爆团块到尘埃覆盖的核再到有核的形态不等。合并阶段的形态变化没有明确的趋势。在大多数情况下，发射线形态延伸到核外，但在四个最新阶段的合并系统中可以看到集中的（1 kpc以内）发射线气体。我们已经量化了每一个核内部100pc和1kpc内的固有光度密度和颜色。我们没有发现明显的证据表明核性质沿合并序列有明显的趋势，除了在该序列中最进化的成员中有暗示的核光度密度上升。核性质缺乏明确的趋势可能是由于遮挡和几何形状的影响，以及图莫尔序列中包含的星系的物理变化。
We report on the properties of nuclear regions in the Toomre sequence of merging galaxies, based on imaging data gathered with the Hubble Space Telescope WFPC2 camera. We have imaged the 11 systems in the proposed evolutionary merger sequence in the F555W and F814W broadband filters, and in Hα+[N II] narrowband filters. The broadband morphology of the nuclear regions varies from nonnucleated starburst clumps through dust-covered nuclei to a nucleated morphology. There is no unambiguous trend in the morphology with merger stage. The emission-line morphology is extended beyond the nucleus in most cases, but centrally concentrated (within 1 kpc) emission-line gas can be seen in the four latest-stage merger systems. We have quantified the intrinsic luminosity densities and colors within the inner 100 pc and 1 kpc of each identified nucleus. We find little evidence for a clear trend in nuclear properties along the merger sequence other than a suggestive rise in the nuclear luminosity density in the most evolved members of the sequence. The lack of clear trends in nuclear properties is likely due both to the effects of obscuration and geometry, as well as the physical variety of galaxies included in the Toomre sequence.