MORPHOLOGY AND MOLECULAR GAS FRACTIONS OF LOCAL LUMINOUS INFRARED GALAXIES AS A FUNCTION OF INFRARED LUMINOSITY AND MERGER STAGE
MORPHOLOGY AND MOLECULAR GAS FRACTIONS OF LOCAL LUMINOUS INFRARED GALAXIES AS A FUNCTION OF INFRARED LUMINOSITY AND MERGER STAGE
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DOI：
10.3847/0004-637x/825/2/128
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发表时间：
2016-05
期刊：
影响因子：
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通讯作者：
K. Larson;D. Sanders;J. Barnes;C. M. Ishida;A. Evans;U. Vivian;J. Mazzarella;Don-Chan Kim;G. Privon;I. Mirabel;H. Flewelling
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文献类型：
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作者：
K. Larson;D. Sanders;J. Barnes;C. M. Ishida;A. Evans;U. Vivian;J. Mazzarella;Don-Chan Kim;G. Privon;I. Mirabel;H. Flewelling
利用哈勃太空望远镜、夏威夷2.2 m望远镜和Pan-STARRS 1巡天的高分辨率I波段图像，对来自大天文台全天亮红外星系巡天（LIRG）的65个本地亮红外星系的完整样本进行了形态和分子气体组分（MGFs）的新的详细分析。我们的分类方案包括单个未受干扰的星系，小合并，和主要的合并，后者分为五个不同的阶段，从前第一近心通道，最后核合并。我们发现，主要的合并分子气体丰富的螺旋显然发挥了重要作用，然而，低于这个亮度阈值，次要的合并和长期的过程占主导地位的所有来源。此外，星系直到合并过程的后期才到达，此时两个盘都接近最终合并。非相互作用和早期主要合并LIRGs的平均MGF（）为18 ± 2%，对于中期主要合并LIRGs增加到33 ± 3%，这与以下假设一致：在主要合并的早期-中期阶段，大的银河系中心半径处的原子气体（HI）的大部分初始大储层被向内扫掠，在那里它转化为分子气体（H2）。
We present a new, detailed analysis of the morphologies and molecular gas fractions (MGFs) for a complete sample of 65 local luminous infrared galaxies from Great Observatories All-Sky Luminous Infrared Galaxies (LIRG) Survey using high resolution I-band images from The Hubble Space Telescope, the University of Hawaii 2.2 m Telescope and the Pan-STARRS1 Survey. Our classification scheme includes single undisturbed galaxies, minor mergers, and major mergers, with the latter divided into five distinct stages from pre-first pericenter passage to final nuclear coalescence. We find that major mergers of molecular gas-rich spirals clearly play a major role for all sources with however, below this luminosity threshold, minor mergers and secular processes dominate. Additionally, galaxies do not reach until late in the merger process when both disks are near final coalescence. The mean MGF ( ) for non-interacting and early-stage major merger LIRGs is 18 ± 2%, which increases to 33 ± 3%, for intermediate stage major merger LIRGs, consistent with the hypothesis that, during the early-mid stages of major mergers, most of the initial large reservoir of atomic gas (HI) at large galactocentric radii is swept inward where it is converted into molecular gas (H2).