Dwarf elliptical galaxies ( dEs ) are elliptical galaxies that are smaller than ordinary elliptical galaxies . They are quite common in galaxy groups and clusters , and are usually companions to other galaxies.
16-527: (Redirected from De ) [REDACTED] Look up de , -de , d.e. , de- , or dé in Wiktionary, the free dictionary. DE , de , or dE may refer to: Human names [ edit ] De (surname) , a Bengali family name Dé (footballer, 1940–1992) , Ademar José Ribeiro, Brazilian football left-back Dé (footballer, born 1998) , Cledson Carvalho da Silva, Brazilian football forward de,
32-476: A nobiliary particle Language and linguistics [ edit ] De (Cyrillic) ( Д, д ), a letter in the Cyrillic script German language (ISO 639-1 alpha-2 code) De (kana) ( で, デ ), a Japanese hiragana/katakana de (interjection) , Albanian interjection de-, an English prefix denoting reversal, undoing, removing; intensifying; or from, off Downward entailing , in linguistic semantics,
48-401: A cluster of galaxies. CG 611 has a gas disk which counter-rotates to its stellar disk, clearly revealing that this dE galaxy's disk is growing via accretion events. If CG 611 was to fall into a galaxy cluster, ram-pressure stripping by the cluster's halo of hot X-ray gas would strip away CG 611's gas disk and leave a gas-poor dE galaxy that immediately resembles the other dEs in
64-434: A cluster. This process of changing a galaxy's morphology by interactions, and the removal of much of its stellar disk, has been called " galaxy harassment ". Evidence for this latter hypothesis has been claimed due to stellar disks and weak spiral arms seen in some dEs. Under this alternative hypothesis, the anaemic spiral arms and disk are a modified version of the original stellar disk of the now transformed spiral galaxy. At
80-543: A common government department Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with the title DE . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=DE&oldid=1248039808 " Categories : Disambiguation pages Place name disambiguation pages Hidden categories: Articles containing Japanese-language text Short description
96-402: A function appear as variables Differential evolution , a method of mathematical optimization Doctor of Engineering , a degree equivalent to a Ph.D. in engineering Dwarf elliptical galaxy (dE), in astronomy Dynamics Explorer , a NASA satellite mission Haplogroup DE (Y-DNA) , a human Y-chromosome DNA haplogroup in genetics ΔE (color space) (dE), a mathematical measurement of
112-483: A property of a modifier that reduces the number or degree an expression Media and business [ edit ] Condor (airline) (IATA code), a German airline Daily Express , a British tabloid newspaper Digital Extremes , a Canadian-operated computer and video game development studio Douwe Egberts , a coffee brand John Deere (NYSE stock ticker symbol), an American machinery manufacturer Military [ edit ] Defence Estates , an agency of
128-536: A single sequence. An even-fainter type of elliptical-like galaxies, called dwarf spheroidal galaxies , may be a genuinely distinct class. Dwarf ellipticals may be primordial objects. Within the currently favoured cosmological Lambda-CDM model , small objects (consisting of dark matter and gas) were the first to form. Because of their mutual gravitational attraction, some of these will coalesce and merge, forming more massive objects. Further mergers lead to ever more massive objects. The process of coalescence could lead to
144-506: Is different from Wikidata All article disambiguation pages All disambiguation pages de">de The requested page title contains unsupported characters : ">". Return to Main Page . Dwarf elliptical galaxy "Dwarf elliptical" galaxies should not be confused with the rare "compact elliptical" galaxy class, of which M32 , a satellite of the Andromeda Galaxy ,
160-570: Is the prototype. In 1944 Walter Baade confirmed dwarf ellipticals NGC 147 and NGC 185 as members of the Local Group by resolving them into individual stars, thanks to their relatively little distance. In the 1950s, dEs were also discovered in the nearby Fornax and Virgo clusters . Dwarf elliptical galaxies have blue absolute magnitudes within the range −18 < M V < −14 : fainter than ordinary elliptical galaxies. The surface brightness profiles of ordinary elliptical galaxies
176-688: The UK Ministry of Defence Desert Eagle , a large-caliber semi-automatic pistol manufactured by Magnum Research Destroyer escort (US Navy hull classification symbol) Places [ edit ] Dé, Mali , a commune and town in Mali De River , Mizoram, India DE, abbreviation for the U.S. State of Delaware , used by the United States Postal Service and others DE postcode area , for Derby and surrounding areas of England Germany (ISO 3166-1 alpha-2 country code) .de ,
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#1733085081848192-440: The ccTLD for Germany Science, technology, and mathematics [ edit ] Design engineer , engineer whose specialty is design Desktop environment , a graphical user interface commonly based on a desktop metaphor Dextrose equivalent , the relative sweetness of sugars Diatomaceous earth , a naturally occurring, soft, siliceous sedimentary rock mineral Differential equation , an equation which derivatives of
208-595: The distance between two points in a Lab color space Other uses [ edit ] De (Chinese) , a concept of integrity in Daoism and virtue in Confucianism Defensive end , a position in American and Canadian football Distance education , studying through a correspondence course De , a scale degree in tonic sol-fa (sharpened form of doh ) See also [ edit ] Department of Education ,
224-455: The present-day galaxies, and has been called "hierarchical merging". If this hypothesis is correct, dwarf galaxies may be the building blocks of today's large spiral galaxies, which in turn are thought to merge to form giant ellipticals . An alternative suggestion is that dEs could be the remnants of low-mass spiral galaxies that obtained a rounder shape through the action of repeated gravitational interactions with ordinary galaxies within
240-411: The same time, the galaxy harassment scenario can not be the full picture. The highly isolated dwarf elliptical galaxy CG 611 possesses the same physical attributes as dE galaxies in clusters – such as coherent rotation and faint spiral arms – attributes that were previously assumed to provide evidence that dE galaxies were once spiral galaxies prior to a transformation process requiring immersion with
256-477: Was formerly approximated using de Vaucouleur's model , while dEs were approximated with an exponentially declining surface brightness profile. However, both types fit well by a more general function, known as Sersic's model , and there is a continuity of Sersic index (which quantifies the shape of the surface brightness profile) as a function of galaxy luminosity. This is interpreted as showing that dwarf elliptical and ordinary elliptical galaxies belong to
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