HousemaidGalaxyThe Virgin cluster is located inVirgoOne of (Virgo)Irregular galaxy cluster(cluster of galaxies), composed of more than 2500 galaxies.(Source of overview diagram[1]）
Beijing TimeAt about 9:00 p.m. on April 10, 2019, astronomers from all over the world, including China, announced the "truth" of black holes simultaneously.The black hole is located in a giant elliptical galaxy in the constellation VirgoM87Its center is 55 million light years away from the earth, and its mass is about 6.5 billion times that of the sun.itsCore areaThere is a shadow surrounded by a crescent halo.EinsteinGeneral relativityIt is proved to be true under extreme conditions.[2]
The Virgo cluster occupies a very long sky area,Angular diameterAbout 12 °;The diameter of the line is about 13 million light years.The Virgo cluster occupies at least 12h~13h of the right ascension on the celestial sphereDeclination+A large area of 20 °~- 20 °.
Cluster center
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messier NebulaThere are 34 extragalactic objects in the cluster tableMember galaxyIt accounts for 16 of them.
Super giant elliptical galaxy M87 (NGC4486) is located in VirgoGalaxy clusterIn the center, there are hundreds ofMember galaxy。Its structure is quite complex, which may be the projection of several galaxy clusters.
