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Norma Cluster
The Norma Cluster (ACO 3627 or Abell 3627) is a rich cluster of galaxies located near the center of the Great Attractor; it is about distant. Although it is both nearby and bright, it is difficult to observe because it is located in the Zone of Avoidance, a region near the plane of the Milky Way. Consequently, the cluster is severely obscured by interstellar dust at optical wavelengths. Its mass is estimated to be on the order of 1015 solar masses. ESO 137-001, an example of a jellyfish galaxy, is located in Abell 3627. Gallery File:New Hubble image of spiral galaxy ESO 137-001.jpg, ESO 137-001 located in the Norma cluster File:A busy patch of the Great Attractor (8386658810).jpg, alt=, ESO 137-2 located in the Norma cluster See also * List of galaxy groups and clusters * Coma Cluster * Eridanus Cluster * Fornax Cluster * Virgo Cluster * X-ray astronomy References External links ESO Press Photos 46a-j/99* NASA The National Aeronautics and Space Administr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epoch (astronomy)
In astronomy, an epoch or reference epoch is a instant, moment in time used as a reference point for some time-varying astronomical quantity. It is useful for the celestial coordinates or orbital elements of a Astronomical object, celestial body, as they are subject to Perturbation (astronomy), perturbations and vary with time. These time-varying astronomical quantities might include, for example, the mean longitude or mean anomaly of a body, the node of its orbit relative to a reference plane, the direction of the apogee or Perihelion and aphelion, aphelion of its orbit, or the size of the major axis of its orbit. The main use of astronomical quantities specified in this way is to calculate other relevant parameters of motion, in order to predict future positions and velocities. The applied tools of the disciplines of celestial mechanics or its subfield orbital mechanics (for predicting orbital paths and positions for bodies in motion under the gravitational effects of other bodi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ESO 137-001
ESO 137-001, also known as the Jellyfish Galaxy, is a barred spiral galaxy located in the constellation Triangulum Australe and in the cluster Norma Cluster, Abell 3627. As the galaxy moves to the center of the galaxy cluster at 1900 km/s, it is stripped by hot gas, thus creating a 260,000 light-year long tail. This is called ram pressure stripping (RPS). The intergalactic gas in Abell 3627 is at 100 million Kelvin, which causes star formation in the tails. The galaxy has a low amount of H I region, Hl regions which combine to a total mass of 3.5x10^8 solar masses, only 10% of which is located in the main disk of ESO 137-001. History The galaxy was discovered by Ming Sun in 2005. Galaxy's fate The stripping of gas is thought to have a significant effect on the Galaxy formation and evolution, galaxy's development, removing cold gas from the galaxy, shutting down the formation of new Star, stars in the galaxy, and changing the appearance of inner spiral arms and bulges becaus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
