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elliptical galaxy


Given the existence of ES galaxies with intermediate-scale disks, it is reasonable to expect that there is a continuity from E to ES, and onto the S0 galaxies with their large-scale stellar disks that dominate the light at large radii. Very little star formation is thought to occur in elliptical galaxies, because of their lack of gas compared to spiral or irregular galaxies. Such major galactic mergers are thought to have been more common at early times.
Define elliptical galaxy.

Elliptical galaxies are characterized by several properties that make them distinct from other classes of galaxy. Elliptical galaxies also appear to have a large amount of dark matter, something that distinguishes even the smallest dwarf ellipticals from simple star clusters. Most of these galaxies are, instead, quasars - a type of active galaxy. An elliptical galaxy is a type of galaxy with an approximately ellipsoidal shape and a smooth, nearly featureless image.

This has been confirmed through spectral observations revealing the rotation of their stellar disks. The dynamical properties of elliptical galaxies and the bulges of disk galaxies are similar, suggesting that they may be formed by the same physical processes, although this remains controversial. Minor galactic mergers involve two galaxies of very different masses, and are not limited to giant ellipticals. ", https://en.wikipedia.org/w/index.php?title=Elliptical_galaxy&oldid=982853228, Creative Commons Attribution-ShareAlike License, This page was last edited on 10 October 2020, at 19:28.

Observations of 46 elliptical galaxies, 20 classical bulges, and 22 pseudobulges show that each contain a black hole at the center. [22], Herschel Space Observatory researchers have speculated that the central black holes in elliptical galaxies keep the gas from cooling enough for star formation. They have the most variation in size of any type of galaxy, as they can be very large, or extremely small, with some of them being less than 10% of the size of our galaxy, the Milky Way.They can often be mistaken for stars due to their compact appearance. They are one of the three main classes of galaxy described by Edwin Hubble in his Hubble sequence and 1936 work The Realm of the Nebulae, along with spiral and lenticular galaxies. It's likely that at least all (non-dwarf) elliptical (and spiral) galaxies that we have observe contain these gravitational monsters. An elliptical galaxy is a type of galaxy with an approximately ellipsoidal shape and a smooth, nearly featureless image. Some can appear as a sphere, whilst others appear as a more oval shape, or an ellipse. They can often be mistaken for stars due to their compact appearance. They contain stars, clouds of gas and dust, planets, and other objects, including black holes.

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Therefore the stars in these galaxies tend to be very old, and star formation regions are relatively rare in these objects. Every massive elliptical galaxy contains a supermassive black hole at its center. So for example, an E0 elliptical is going to be almost a perfect sphere, whereas an E7 galaxy is going to be very oval shaped, like a football. These are similar to their smaller brethren, but more diffuse, with large haloes that may as much belong to the galaxy cluster within which they reside than the centrally-located giant galaxy. They are one of the three main types of galaxy originally described by Edwin Hubble in 1936. Messier 85 (M85) is a lenticular or elliptical galaxy located in the Virgo Cluster of galaxies, in the constellation Coma Berenices.

An elliptical galaxy is a galaxy having an ellipsoidal shape, and a smooth, nearly featureless brightness profile. The elliptical galaxy is one of the most intriguing parts of our universe. There are elliptical galaxies in our universe that have trillions of stars, some of them even having more than one hundred trillion. Supermassive Black Holes are Galaxy Monsters, gas from a planetary nebula or a supernova explosion, Ph.D., Physics and Astronomy, Purdue University.

[20] It has been theorized that an elliptical galaxy will result from a merger of the two spirals. Angular Momentum and Constraints on Formation Scenarios, Future evolution of nearby large-scale structures in a universe dominated by a cosmological constant, "Red And Dead Galaxies Have Beating Black Hole 'Hearts', Preventing Star Formation. Giant ellipticals, such as M87, may contain over 10 trillion solar masses in the form of stars, are among the largest of galaxies, and are often found at the heart of rich clusters of galaxies, i.e. As well as being the largest, elliptical galaxies can also be the smallest galaxies in our universe too.

We hope to learn more about the elliptical galaxy in the coming years, with more discoveries being made each year.

Elliptical galaxies aren’t just different from spiral galaxies due to their appearance.

Elliptical galaxies vary greatly in both size and mass with diameters ranging from 3000 lightyears to more than 700,000 lightyears, and masses from 105 to nearly 1013 solar masses. They are spherical or ovoid masses of stars, starved of star-making gases. They have the most variation in size of any type of galaxy, as they can be very large, or extremely small, with some of them being less than 10% of the size of our galaxy, the Milky Way. [16][17] Hubble recognized that his shape classification depends both on the intrinsic shape of the galaxy, as well as the angle with which the galaxy is observed. Let’s look at some more interesting facts about the Elliptical galaxy. These large elliptical galaxies are referred to as ‘giants’. The galaxy lies at an approximate distance of 60 million light years from Earth and has an apparent magnitude of 10. Most galaxies in the universe are spiral galaxies, much like our own Milky Way. The motion of stars in elliptical galaxies is predominantly radial[citation needed], unlike the disks of spiral galaxies, which are dominated by rotation. Some are only a fraction the size of the Milky Way while others are many times larger, and at least one elliptical called M87 has a visible jet of material streaming away from its core. All elliptical galaxies have a supermassive black hole at their center – the size of the black hole is directly related to the size of the galaxy itself.
It is sometimes said that there are two physical types of ellipticals: the giant ellipticals with slightly "boxy"-shaped isophotes, whose shapes result from random motion which is greater in some directions than in others (anisotropic random motion); and the "disky" normal and dwarf ellipticals, which contain disks. The current stars of those galaxies would become intermixed, while the gas and dust would collide.The result would be a sudden burst of star formation, using up much of the available gas and dust. Elliptical galaxies also appear to have a large amount of dark matter, something that distinguishes even the smallest dwarf ellipticals from simple star clusters. While this is somewhat difficult to prove, even in galaxies where we don't directly "see" a black hole, that does not necessarily mean that one is not there. Elliptical galaxies can have as little as ten million stars in them, or as much as one hundred trillion stars in them – they vary greatly! Many globulars however, are as old as (or even older than) the galaxies where they orbit.

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