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type="text/css"></style> <div id="ct" class="ct2 wp cl"> <div class="mn"> <div class="bm_haa cl"> <div class="bm_h cl"> <a href="http://www.oecr.com/portal.php?mod=rss&catid=57" class="y xi2 rss" target="_blank" title="RSS">订阅</a><h1 class="xs2">文章</h1> </div></div> <div class="kjkjb"> <div class="bm vw" style="margin-bottom:0;"> <div class="h hm"> <div class="zxtoux"><img src="http://www.oecr.com/uc_server/avatar.php?uid=54876&size=small" /></div> <h1 class="ph">南非开建HIRAX望远镜阵列 专注暗能量与无线电爆发现象的研究 </h1> <p class="xg1"> 时间：2018-8-23 09:51<a class="zz" href="home.php?mod=space&uid=54876">作者：update</a> 阅读<em id="_viewnum">(1224)</em> 评论: <a href="http://www.oecr.com/portal.php?mod=comment&id=6979&idtype=aid" title="查看全部评论"><em id="_commentnum">5</em></a></p> <div class="zxfb" ><a href="http://www.oecr.com/portal.php?mod=rss&catid=57" class="y xi2 rss" target="_blank" title="RSS">订阅</a></div> </div> <!--[diy=diysummarytop]--><div id="diysummarytop" class="area"></div><!--[/diy]--> <div class="s"> <div class="ss"><div><span>导读： </span>南非正在成为世界上最重要的射电天文中心之一。这在很大程度上，要归功于该国为“平方公里阵列”（简称 SKA）共同主持人的身份。</div> </div> <!--[diy=diysummarybottom]--><div id="diysummarybottom" class="area"></div><!--[/diy]--> <div class="d"> <!--[diy=diycontenttop]--><div id="diycontenttop" class="area"></div><!--[/diy]--> <table cellpadding="0" cellspacing="0" class="vwtb"><tr><td id="article_content"><div> 南非正在成为世界上最重要的射电天文中心之一。这在很大程度上，要归功于该国为“平方公里阵列”（简称 SKA）共同主持人的身份。现在，一架新的望远镜即将在 SKA 南非站址所在地的 Karoo 开建，它就是 HIRAX 。其全称为“氢强度与实时分析实验”（HIRAX），是由 KwaZulu-Natal 大学科学家们领导的一个国际合作项目。</div><div><br></div><div><p style="text-align: center;"><a href="data/attachment/portal/201808/23/095043u3jmej4pl3vd3djy.png" target="_blank"><img src="data/attachment/portal/201808/23/095043u3jmej4pl3vd3djy.png"></a></p></div><div><br></div><div> 外媒 The Conversation Africa 与项目负责人 Kavilan Moodley 进行了交流，期间畅谈了 HIRAX 的科学目标。</div><div><br></div><div> 首先，HIRAX 十一组干涉仪阵列 —— 阵列的实际效果很酷、由 1024 个 6 米长的碟子组成；其结合了许多望远镜的信号、提供了更大的观察分辨率。</div><div><br></div><div> 其次，HIRAX 有两个主要的科学目标 —— 追踪星系里中性的氢气，来研究暗能量的演变；以及探测和定位被称作快速无线电爆发的‘神秘闪光’。</div><div><br></div><div> 暗能量是推动宇宙加速膨胀的神秘能量，HIRAX 能够利用自然界提供的独特的“宇宙标尺”来研究它，即“重子声震荡”。</div><div><br></div><div> 其产生于宇宙的非常早期，是一种热而密集的粒子+光汤。微小的不规则性，在这锅‘原始汤’中产生了声波。</div><div><br></div><div> 这些波在行进时携带了物质，直到光与物质分离、以非常特征的方式分布了物质。而中性的氢气，就是宇宙物质分布的一个重要指示剂。</div><div><br></div><div> 中性氢在 1420MHz 发出信号，正好处于蜂窝网络和 UHF 电视频道所使用的频率范围内。当宇宙膨胀时，信号会被拉伸到更低的频率。</div><div><br></div><div> HIRAX 被设置在 400——800 MHz 之间运行，以便探测到 70——110 亿年之前映射到宇宙中的‘回声’（中性氢）。</div><div><br></div><div> 研究该阶段的暗能量，或有助于揭示它的性质，因为这是暗能量成为宇宙中主要成分、并加速其扩张的关键时期。</div><div><br></div><div> 研究的另一个重点领域，涉及神秘而明亮的“毫秒闪光”。科学家们将之称作“无线电爆发”，由于时间太短、迄今不清楚其成因。</div><div><br></div><div> 由于望远镜只能观察天空的一小部分区域，该现象被发现和定位。HIRAX 的大视野，能够看到更大的范围、从而提升发现的几率（每天十几次）。</div><div><br></div><div> 此外 HIRAX 将通过与其它几个南部非洲国家合作，建造 8 碟式悬梁臂阵列（Outrigger Arrays），以增加准确找出无线电爆发位置的能力。</div><div><br></div><div><p microsoft="" yahei",="" simsun;="" 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name="comment_anchor_19137"></a> <dl id="comment_19137_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(19137, '6979');">引用</a> </span> <a href="http://club.oecr.com/space-uid-63770.html" class="xi2 xw1" c="1">xy_zuo</a> <span class="xg1 xw0">2018-8-23 19:45</span> </dt> <dd>确实不错，顶先</dd> </dl><a name="comment_anchor_19131"></a> <dl id="comment_19131_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(19131, '6979');">引用</a> </span> <a href="http://club.oecr.com/space-uid-116252.html" class="xi2 xw1" c="1">毛毛虫7888</a> <span class="xg1 xw0">2018-8-23 16:45</span> </dt> <dd>光电技术选择没错。</dd> </dl><a name="comment_anchor_19130"></a> <dl id="comment_19130_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(19130, '6979');">引用</a> </span> <a href="http://club.oecr.com/space-uid-17184.html" class="xi2 xw1" c="1">kan6541</a> <span class="xg1 xw0">2018-8-23 16:15</span> </dt> <dd>光电工程师社区是个好地方</dd> </dl><a name="comment_anchor_19121"></a> <dl id="comment_19121_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(19121, '6979');">引用</a> </span> <a href="http://club.oecr.com/space-uid-33405.html" class="xi2 xw1" c="1">Candy_liu</a> <span class="xg1 xw0">2018-8-23 11:45</span> </dt> <dd>找这个很久了。</dd> </dl><a name="comment_anchor_19120"></a> <dl id="comment_19120_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(19120, '6979');">引用</a> </span> <a href="http://club.oecr.com/space-uid-31670.html" class="xi2 xw1" c="1">dck</a> <span class="xg1 xw0">2018-8-23 11:15</span> </dt> <dd>very good ！！</dd> </dl></div> </div> <!--[diy=diycontentcomment]--><div id="diycontentcomment" 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