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Near-infrared background anisotropies from diffuse intrahalo light of galaxies

机译:星系的弥散光晕内光的近红外背景各向异性

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摘要

Unresolved anisotropies of the cosmic near-infrared background radiation are expected to have contributions from the earliest galaxies during the epoch of reionization~(1-5) and from faint, dwarf galaxies at intermediate redshifts~(6,7). Previous measurements~(8-12) were unable to pinpoint conclusively the dominant origin because they did not sample spatial scales that were sufficiently large to distinguish between these two possibilities. Here we report a measurement of the anisotropy power spectrum from subarcminute to one-degree angular scales, and find the clustering amplitude to be larger than predicted by the models based on the two existing explanations. As the shot-noise level of the power spectrum is consistent with that expected from faint galaxies, a new source population on the sky is not necessary to explain the observations. However, a physical mechanism that increases the clustering amplitude is needed. Motivated by recent results related to the extended stellar light profile in dark-matter haloes13"15, we consider the possibility that the fluctuations originate from intrahalo stars of all galaxies. We find that the measured power spectrum can be explained by an intrahalo light fraction of 0.07 to 0.2 per cent relative to the total luminosity in dark-matter haloes of 10~9 to 10~12 solar masses at redshifts of about 1 to 4.%在过去二十年里,太空望远镜探测到了无法用来自已知星系的辐射来解释的近红外背景辐射中所表现出的差异。人们提出的关于这一“额外辐射”的来源包括在再电离时期来自最早星系的辐射以及来自处于中红移位置的、暗淡的矮星系的辐射。这些辐射源本应在近红外背景的空间变化上留下特征印记,但以前的测量工rn作并没有在大到足以能够分辨这些特征的空间尺度上进行取样。现在,Asarltha Cooray等人报告了来自“斯皮策望远镜”的测量结果(该望远镜是在大至一度的角度取样的),并且发现,以前提出的来源并不能解释这些数据。相反,他们认为,所观察到的波动来自“晕内星”,它们在星系振荡期间从其主星系剥离了出来,迁移到了这些星系的“暗物质晕”中的遥远轨道上。
机译:宇宙近红外本底辐射的未解决的各向异性有望在电离时代(1-5)期间由最早的星系以及在中间红移〜(6,7)时由微弱的矮星系贡献。先前的测量结果(8-12)无法确切地确定主导原点,因为它们没有采样足够大的空间比例来区分这两种可能性。在这里,我们报告了从亚弧度到一度角尺度的各向异性功率谱的测量结果,并且基于两个现有解释,发现聚类幅度大于模型预测的幅度。由于功率谱的散粒噪声水平与微弱星系预期的一致,因此不需要新的天空源来解释观测结果。但是,需要增加聚类幅度的物理机制。受与暗物质晕球13“ 15中恒星光分布扩展有关的最新结果的启发,我们考虑了这种波动可能源自所有星系的恒星内部恒星的可能性。我们发现,测得的功率谱可以由相对于10到9到10到12太阳质量的暗物质光晕中总光度的0.07%到0.2%,在红移约1-4时。%星际的辐射来解释的近红外背景辐射中所表现出的差异。有人提出的关于这一“额外辐射”的来源包括在再电离时期来自初始星系的辐射以及来自中红移位置的,暗淡的这些辐射源本应在近红外背景的空间变化上留下特征印记,但以前的测量工rn作并没有在大到能够分辨这些特征的空间尺度上进行取样。现在,Asarltha Cooray等人报告了来自“斯皮策望远镜”的测量结果(该望远镜是在大至一度的角度采样的),并且发现,以前提出的来源并且不能解释这些数据。相反,他们认为,所观察到的波动来自“晕内星”,它们在星系振荡期间从其主星系剥离了出来,迁移到了这些星系的“暗物质晕”中的遥远轨道上。

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  • 来源
    《Nature》 |2012年第7421期|p.514-516A3|共4页
  • 作者单位

    Department of Physics and Astronomy, University of California, Irvine, California 92697, USA;

    Department of Physics and Astronomy, University of California, Irvine, California 92697, USA;

    Department of Physics and Astronomy, University of California, Irvine, California 92697, USA;

    Department of Physics and Astronomy, University of California, Irvine, California 92697, USA;

    Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA;

    Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA;

    Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA;

    Department of Physics and Astronomy, University of California, Irvine, California 92697, USA;

    Department of Astronomy, University of Florida, Gainesville, Florida 32611, USA;

    Department of Astronomy.The Ohio State University, Columbus, Ohio 43210, USA;

    Department of Astronomy.The Ohio State University, Columbus, Ohio 43210, USA Warsaw University Observatory, Aleje Ujazdowskie4,00-478 Warszawa, Poland;

    Departmentof Physics and Astronomy, University of California, Los Angeles, California 90095, USA;

  • 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);
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