本帖最后由 gohomeman1 于 2009-12-19 23:35 编辑
02 March 2009: The Sombrero Galaxy
2009.3.2：著名的草帽星系M104
One of most famous spiral galaxies is Messier 104, widely known as the "Sombrero" (the Mexican hat) because of its particular shape. It is located towards the constellation Virgo (the ‘virgin’), at a distance of about 30 million light-years and is the 104th object in the famous catalogue of deep-sky objects by French astronomer Charles Messier(1730 - 1817).
M104是个著名的漩涡星系，因其醒目的外形又名“草帽”星系或“墨西哥帽檐”星系。它位于室女座，离我们约三千万光年，在著名的梅西尔星表中编号为104。这个星表是由著名的法国天文学家查理.梅西尔（1730—1817）编纂的深空天体表。
This luminous and massive galaxy has a total mass of about 800 billion suns, and is notable for its dominant nuclear bulge, composed mainly of mature stars, and its nearly edge-on disc composed of stars,gas, and dust. The complexity of this dust is apparent directly infront of the bright nucleus, but is also evident in the dark absorbing lanes throughout the disc. A large number of small, diffuse objects canbe seen as a swarm in the halo of Messier 104. Most of these are globular clusters, similar to those found in our own Milky Way, but Messier 104 has a much larger number of them. This galaxy also appears to host a supermassive black hole of about 1 billion solar masses, one of the most massive black holes measured in any nearby galaxy, and 250 times larger than the black hole in the Milky Way. Despite having such a massive black hole at its centre, the galaxy is rather quiet,implying that the black hole is on a very stringent diet.
这个明亮星系的质量约为8000亿个太阳，显著的核球区主要由老年的恒星组成，而其由恒星、尘埃、气体等组成的星系盘几乎侧对着我们。星系盘中遍布尘埃带，错综复杂的尘埃带正好位于明亮核心的前方。大量小天体集团如蜂群般弥散在M104的星系晕中，其中大部分是球状星团，类似于我们银河系中那样，但M104中多得多了。此星系核心还有个约10亿太阳质量的超级黑洞，是我们银河系中心黑洞质量的250倍，也是邻近星系中质量最大的黑洞之一。虽然中心黑洞质量这么大，星系还是很安静，暗示这个黑洞快饿昏了（进食量很小）。
This image is based on data acquired with the 1.5 m Danish telescope at the ESO La Silla Observatory in Chile, through three filters (B: 120s, V: 100 s, R: 100 s).
本图根据ESO拉斯拉天文台的1.5米丹麦望远镜获得的数据制作，曝光时间：蓝120秒，黄/绿：100秒；红：100秒。
This image in high-resolution is available in the image archive.
本图的高清晰版本见下楼。 |
显身卡
好图呀，我收藏了
