国产精品99一区二区三_免费中文日韩_国产在线精品一区二区_日本成人手机在线

Satellite dwarf galaxies contradict common cosmological models

Source: Xinhua| 2018-02-02 04:36:15|Editor: yan
Video PlayerClose

WASHINGTON, Feb. 1 (Xinhua) -- An international team of astronomers have determined Centaurus A, a massive elliptical galaxy 13 million light-years from Earth, is accompanied by a number of dwarf satellite galaxies in a narrow disk.

The study, published on Thursday in the journal Science, showed that such a disc-like pattern does not fit with a standard model of cosmology that assumes the existence of dark matter.

According to the standard model that describes the formation of galaxies, the satellite galaxies should be distributed randomly and should orbit the host galaxy in an unordered way.

Observations of the Milky Way and the Andromeda galaxy, however, challenge this model. A few years ago, astronomers discovered that satellite galaxies are arranged in disc-shaped planes around the host galaxy and co-rotate within such planes. But advocates of the standard model interpreted these structures as isolated cases.

However, new findings by researchers from Switzerland, America and Australia suggested that these are not statistical outliers, but are part of a widespread phenomenon.

The researchers analyzed the movement of satellite galaxies around Centaurus A and found that those satellites are arranged on a plane that is perpendicular to the parent galaxy.

The researchers said that 14 of the 16 satellite galaxies follow the same pattern of movement and are likely rotating within the plane around the main galaxy. According to model simulations with dark matter, however, only half a percent of satellite systems in the local universe at most should behave this way.

The possibility of coincidence can be ruled out, as this result has now been detected a third time, in Centaurus A.

The results also strengthen the supposition that satellite galaxies form during the collision of two larger galaxies, out of small debris ejected by tidal forces.

TOP STORIES
EDITOR’S CHOICE
MOST VIEWED
EXPLORE XINHUANET
010020070750000000000000011105521369430141
主站蜘蛛池模板: 英吉沙县| 和平县| 建湖县| 光山县| 茌平县| 石门县| 习水县| 英德市| 德化县| 白城市| 四川省| 神池县| 贵阳市| 巍山| 东平县| 霍城县| 二连浩特市| 望江县| 贵德县| 锡林郭勒盟| 东平县| 宝山区| 岑溪市| 西华县| 佛冈县| 奉化市| 辉县市| 安义县| 古丈县| 勃利县| 山西省| 彭阳县| 宝兴县| 桐柏县| 余江县| 黔江区| 蒙城县| 获嘉县| 柞水县| 漳平市| 达孜县|