中大機構典藏-NCU Institutional Repository-提供博碩士論文、考古題、期刊論文、研究計畫等下載:Item 987654321/50724
English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 78728/78728 (100%)
造访人次 : 33559303      在线人数 : 655
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜寻范围 查询小技巧:
  • 您可在西文检索词汇前后加上"双引号",以获取较精准的检索结果
  • 若欲以作者姓名搜寻,建议至进阶搜寻限定作者字段,可获得较完整数据
  • 进阶搜寻


    jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/50724


    题名: GRB 070518: a gamma-ray burst with optically dim luminosity
    作者: Xin,LP;Zheng,WK;Wang,J;Deng,JS;Urata,Y;Qiu,YL;Huang,KY;Hu,JY;Wei,JY
    贡献者: 天文研究所
    日期: 2010
    上传时间: 2012-03-27 18:08:48 (UTC+8)
    出版者: 國立中央大學
    摘要: We present our optical observations of the GRB 070518 afterglow obtained at the 0.8-m Tsinghua University-National Astronomical Observatory of China Telescope (TNT) at Xinglong Observatory. Our follow-up observations were performed from 512 s after the burst trigger. With the upper limit of redshift similar to 0.7, GRB 070518 is found to be an optically dim burst. The spectra indices beta(ox) of optical to X-ray are slightly larger than 0.5, which implies that the burst might be a dark burst. The extinction A(V) of the host galaxy is 3.2 mag, inferred from the X-ray hydrogen column density with Galactic extinction law, and 0.3 mag with the Small Magellanic Cloud extinction law. Also, it is similar to three other low-redshift optically dim bursts, which belong to X-ray rich gamma-ray bursts or X-ray flashes and have mid-term duration (T(90) < 10, except for GRB 070419A, T(90) = 116 s). Moreover, its R-band afterglow flux is well fitted by a single power law with an index of 0.87. The optical afterglow and the X-ray afterglow in the normal segment might have the same mechanism, as they are consistent with the prediction of the classical external shock model. Besides, GRB 070518 agrees with the Amati relation under reasonable assumptions. The Ghirlanda relation is also tested with the burst.
    關聯: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
    显示于类别:[天文研究所] 期刊論文

    文件中的档案:

    档案 描述 大小格式浏览次数
    index.html0KbHTML395检视/开启


    在NCUIR中所有的数据项都受到原著作权保护.

    社群 sharing

    ::: Copyright National Central University. | 國立中央大學圖書館版權所有 | 收藏本站 | 設為首頁 | 最佳瀏覽畫面: 1024*768 | 建站日期:8-24-2009 :::
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 隱私權政策聲明