The mantelpiece isSouthern constellation, onEridanaA bend in the West Bank was created by Abi Nicolas de Lakelle in 1751-1752, and was initially called the "chemical furnace".Later, the astronomer John Bode (1747-1826) tried to present it to the French chemist Anthony Lavoisier (1743-1794).
In theory, it can be seen above 50 degrees north latitude, but because it is composed of stars of magnitude 4 and 5, it cannot be seen in the lower part of the horizon, and only in the tropics or the southern hemisphere can it be seen in its entirety.Its midnight peak is in early November.When the center is at right ascension 3, the declination is - 32 degrees.Westward connectionSculptor, and isEridanaSurrounded by.The brightest stars in the constellation are two fourth class stars.
In 1752, the French astronomerLakayTo fill the original interstellar spaceSouthern constellation, originally called“Chemical furnace base”。The stars in the constellation Aurora are very dark.Westward connectionSculptorThe southeast is surrounded by the constellation Eridanus, which is generally in the meander of a long string of dark stars in the constellation Eridanus, but it is difficult to distinguish it from these dark stars.There is a famousThe Inferno Galaxy Cluster。
It is a very common constellation, in an inconspicuous corner of the sky.The river represented by the constellation of Eridanus flows from the side, and the north side isCetus。Constellations are French astronomers in the 18th centuryLakayIt symbolizes the chemical furnace.The Inferno Galaxy ClusterIs 7500 light years away from the earthGalaxy cluster, two brightest starsGalaxyNGC1316 and NGC1365 are visible with a small telescope.NGC1316 is abnormalspiral galaxy, called wireless power supply cupola A;NGC 1365 is a bar spiral galaxy.
Although this constellation is not very south, it was not until 1752 that the French astronomer Lakay described it.There is no star in this constellation whose magnitude exceeds+4.But in fact, the constellation contains a galaxy group with many kinds of objects.Use a telescope 8 inches (20 centimeters) or larger to see it.
The cluster can distinguish at least 18 galaxiesThe brightest one isNGC 1316Its magnitude is+10Among them, the impressive classical bar galaxy isNGC 1097This deep space object is a typical bar galaxyIts peripheral rotating arm is weakThe magnitude is+10.2.
The galaxy cluster located in the constellation Fornix is about 75 million light years away from the Earth. This cluster can distinguish at least 18 galaxies.The brightest one is NGC1316. Its magnitude is+10.The impressive classical bar galaxy is NGC1365, which is a powerful X-ray source.Although it is much smaller than the Virgo Galaxy Cluster, it is still the second richest galaxy cluster within 100 million light years.The main part of it is located in the constellation of Forus, and may be combined with the constellation of Rivers, which is too small as a galaxy cluster. Therefore, the constellation of Forus may provide information on the development of galaxy clusters, showing the role of the merger of small groups in the main group.In turn, it can provide information about the structure of the associated supercluster.The motion characteristics of galaxy clusters can be understood from two aspects, namely, the visual motion of the whole cluster and the random relative motion among the member galaxies in the cluster.
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The radial velocity of the galaxy cluster as a whole meets the distance between the galaxy clusterHubble's law, that is, the farther the distance is, the greater the visual speed is.For example, in the near Virgo cluster, we have a gap of about 19 million seconds, and the visual speed is 1180 km/s;The Snake II cluster is about 1000 million seconds away from us, and its visual speed is 60000 km/s.The relative motion of different member galaxies in a cluster can be expressed by the velocity dispersion.Generally speaking, with the expansion of the scope of galaxy clusters and the increase of the number of members, the velocity dispersion becomes larger and larger.The velocity dispersion of small clusters is about 250~500 km/;The velocity dispersion of large clusters is as high as 2000 km/s.The study of the velocity divergence of galaxy clusters is of great significance.On the one hand, we can use the Virial theorem to estimate the average mass of each galaxy in the cluster according to the velocity dispersion;On the other hand, the study of the internal motion of galaxy clusters is closely related to the exploration of the stability of galaxy clusters.
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Galaxy
NGC1907: A bar like structure penetrating the galactic nucleusspiral galaxy 。In the classification of galaxies, it is represented by the symbol SB to distinguish it from the normal spiral galaxy S.In the light of the whole dayGalaxyAmong them, NGC1907 bar spiral galaxies account for about 15%.When dark galaxies are counted, the proportion of barred spiral galaxies increases to 25%.In terms of mass, luminosity and spectrum, the distribution of gas and dust,Galactic diskAnd the structure and spatial distribution of galactic halosspiral galaxybe similar.
The motion of NGC1907 bar spiral galaxyspecialsignYes: the core is often a fast rotating body with large mass, and its motion state and spatial structure are complex. The gas and stars inside and near the rod structure have non circlesmotion；NGC1907 galactic disk seems to dominate the exterior of the galaxy, accounting for a large part of the mass of the galaxy.
NGC1907 bar spiral galaxy has many basic problems to be solved, such as how the bar structure is formed, and what role it plays in the evolution of galaxies.
according toHubbleThe classification of barred spiral galaxies can be divided into three categories: ① normal barred spiral galaxies SBa, SBb, and SBc; ②Lenticular barred spiral galaxy SB0; ③Irregular barred spiral galaxies SBd and SBm.Normal barred spiral galaxies are characterized by an obvious rod like structure, with spiral arms protruding from the end of the rod, usually at 90 degrees with the rod body.The rotating arm expands from a to c.The rod structure of SBa and SBb is smooth, while the rod body of SBc andSwivel armThere are clearly visible bright stars, bright knots or bright clusters on the.The difference between lenticular rod spiral galaxy SB0 and elliptical galaxy is that it has no spiral arms. Its shape is like the figure of the Greek letter 0, that is, there is a bright core in the center and a ring of lens with darker brightness outside the core and concentric with the coreGalactic diskThe two ends of the rod body generally intersect on the periphery of the disc body.The Bars of Irregular Bar Spiral Galaxies SBd and SBmstructureNot necessarily at the center of the galaxy.The luminosity of rod structure accounts for 10-20% of the luminosity of star system;The color is often redder than the swing arm.
The total span of this pair of radio double lobes exceeds 1 millionLight year。In the center is a huge and strange elliptical galaxy called NGC1316.A detailed study of NGC1316 shows that it began to devour a nearby small galaxy about 100 million years ago.The gas in the galaxy collision falls inward into the massive black hole in the center, and in the process, friction heats the gas to 10 million degrees.For reasons that are not well understood, two jets of fast moving particles in opposite directions formed, and finally rushed violently into this hugeellipseThe surrounding matter on either side of a galaxy.hisresultIt forms a huge reservoir of hot gas that emits radio radiation.The strange pattern on the radio lobe may indicate a slight change in the direction of the jet.
