APOD090503-09图集 爱斯基摩星云,土星光环,NGC 6164,英仙座星系团

今天的APOD继续酷图，发射星云NGC 6164的晕轮
2009 May 7
A Halo for NGC 6164

                               
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Credit & Copyright: Don Goldman
Explanation:
Beautiful emission nebula NGC 6164 was created by a rare, hot, luminous O-type star, some 40 times as massive as the Sun. Seen at the center of the cosmic cloud, the star is a mere 3 to 4 million years old. In another three to four million years the massive star will end its life in a supernova explosion. Spanning around 4 light-years, the nebula itself has a bipolar symmetry. That makes it similar in appearance to more familiar planetary nebulae - the gaseous shrouds surrounding dying sun-like stars. Also like many planetary nebulae, NGC 6164 has been found to have an extensive, faint halo, revealed in this deep telescopic image of the region. Expanding into the surrounding interstellar medium, the material in the halo is likely from an earlier active phase of the O star. The gorgeous skyscape is a composite of narrow-band image data highlighting the glowing gas, and broad-band data of the surrounding starfield. NGC 6164 is 4,200 light-years away in the southern constellation of Norma.

两家都还没翻译，大家再等一会儿。这是北京天文馆的翻译。

NGC6164的晕轮
影像提供及版权；Don Goldman
说明：
美丽的发射星云NGC6164是由一颗极其罕见、炽热的高光度O型恒星产生，其质量大约是太阳的40倍。在这个宇宙星云的中央，这颗恒星年龄仅仅3,4百万年。再过3,4百万年，这颗大质量恒星将以超新星爆发的形式结束自己的生命。星云大约覆盖4光年左右，其本身具有两极对称。这使得它外表看上去更似行星状星云—因为周围有濒临死亡恒星放出的气体罩。就像其他许多行星状星云一样，在这张望远镜深空影像中，NGC6164被发现有一个广阔而又昏暗的晕轮。晕轮内的物质正向周围的星际介质扩散，这可能是更为早期O恒星活跃阶段时形成的产物。这张绚丽的影像是一张合成影像，结合了突出炽热气体的窄带影像数据以及周围星场的宽带数据。NGC6164距离我们4,200光年远，位于矩尺座内。

本周APOD的图总体觉得很不错，今天的星云图很大，2500X2500。可惜APOD虽然也是NASA网站的一部分，图片速度远远不如我发的另一个NASA图集快。现在大图改为同好论坛镜像

http://apod.nasa.gov/apod/image/0905/NGC6164Web_goldman.jpg

                               
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今天的APOD图，英仙座星系团

2009 May 8
Galaxies of the Perseus Cluster

                               
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Credit & Copyright: R. Jay Gabany
Explanation:
This colorful telescopic skyscape is filled with galaxies that lie nearly 250 million light-years away, the galaxies of the Perseus cluster. Their extended and sometimes surprising shapes are seen beyond a veil of foreground stars in our own Milky Way. Ultimately consisting of over a thousand galaxies, the cluster is filled with yellowish elliptical and lenticular galaxies, like those scattered throughout this view of the cluster's central region. Notably, at the large galaxy at the left is the massive and bizarre-looking NGC 1275. A prodigious source of high-energy emission, active galaxy NGC 1275 dominates the Perseus cluster, accreting matter as entire galaxies fall into it and feed the supermassive black hole at the galaxy's core. Of course, spiral galaxies also inhabit the Perseus cluster, including the small, face-on spiral NGC 1268, right of picture center. The bluish spot on the outskirts of NGC 1268 is supernova SN 2008fg. At the estimated distance of the Perseus galaxy cluster, this field spans about 1.5 million light-years.

北京天文馆的翻译。

英仙座星系群
影像提供及版权：R. Jay Gabany
说明：
这张彩色望远镜影像里充满了星系，它们距离我们近2.5亿光年远，这就是英仙座星系群。在我们银河系前景恒星形成的面纱外就能看到这些延伸，有时形状奇怪的星系。星系团由超过1,000颗星系组成，其内充满了泛黄色的椭圆星系及透镜状星系，就像分散在星系团中央区域的星系一样。很明显，左侧的巨大星系就是质量超大、样子奇怪的NGC1275。作为一个高能发射源，活跃星系NGC1275主宰着英仙座星系群，当整群星系掉进并被星系中央的超级大质量黑洞吞噬的同时会伴随着物质产生。当然，英仙座内还有旋涡星系，包括规模较小、面向我们的旋涡星系NGC1268，它位于影像中央右侧。NGC1268边界附近，那泛蓝色的点就是超新星SN2008fg。在英仙座星系群的估计距离上，这片区域覆盖大约1,500万光年。

英仙座星系团（编号Abell 426）的大图，2744X1894，可惜速度还是慢。图中颜色最丰富的就是星系团的中心星系——英仙座A。

http://apod.nasa.gov/apod/image/0905/PerseusCluster_gabany_abell426.jpg

                               
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J Gabany 的作品

今天成大到现在还没翻译，但北馆翻译中存在明显的错误。

accreting matter as entire galaxies fall into it and feed the supermassive black hole at the galaxy's core.
星系中央的超级黑洞吸积并吞噬了相当于整个（矮）星系质量的物质。
这里显然不是整群星系质量的物质（吞噬了一个星系团的黑洞还没发现呢，现在最大质量的黑洞貌似80亿个太阳，其实也就相当于一个矮星系）。

今天的APOD，巴西夜空的满天星斗

2009 May 9
A Starry Night in Brazil

                               
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Credit &Copyright: BabakTafreshi(TWAN)
Explanation:
This panoramic image tracingconstellations in thesouthern sky shows offa beautiful vista toward the center of our MilkyWay Galaxy.It was recorded just last month near thecity ofCampos in northeastern Rio de Janeiro state, Brazil.A sugar cane field from one of the historic region's local farmslies in the foreground.From left to right, the view sweeps across theGalactic Centerin Sagittarius, bright stars in the tail ofScorpius, theSouth Celestial Pole above and right ofthe gap in the sugar canes, the darkCoalsack Nebula, and the Southern Cross.The closest star system,Alpha Centauri,and the giantOmega Centauriglobular star cluster also shine in the starry night.

今天的成大翻译

巴西的星空
影像版權與提供: Babak Tafreshi (TWAN)
說明:
這幅全景影像，呈現了南天的星座以及銀河系中心附近的美麗星場。影像是在上個月在巴西東北部里約熱內盧州的Campos市附近拍攝的，前景則是當地代代相傳的甘蔗園之一。影像由左至右，掃過了位在半人馬座的銀河中心、天蝎尾部的亮星、綿延蔗園缺口右方上空的南天極、黝黑的煤袋星雲、和南十字。除此之外，此遍星空中還有離我們最近的恆星系統 - 南門二星及龐大的半人馬座Omega球狀星團。名詞對照：Rio de Janeiro state (里約熱內盧州)、Coalsack Nebula (煤袋星雲)、Alpha Centauri (南門二星)。

今天的大图已经发了。下周起本版有2个活动，为鼓励各位同好踊跃发帖，我准备停掉APOD的每周图集，好图大家一起发。

嘿嘿，貌似同样的图，我发了就没人说好。

目不暇给啊～都很好。

是啊 是啊！很赞！

mark下，几张大图很不错~

这事在院中拍的么？设计者估计也是天文方面的爱好者啊