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Markarian Galaxies
The Markarian galaxies are a class of galaxies that have nuclei with excessive amounts of ultraviolet emissions compared with other galaxies. Benjamin Markarian drew attention to these types of galaxies starting in 1963. The nuclei of the galaxies had a blue colour, associated to stars in the classes from O to A. This blue core did not match the rest of the galaxy. The spectrum in detail tends to show a continuum that Markarian concluded was produced non- thermally. Most of these have emission lines and are characterized by highly energetic activity. Markarian Catalogue entries are of the form "Markarian ####", and can frequently use the abbreviations Mrk, Mkr, Mkn; and rarely Ma, Mk, Mark. History In 1964 Markarian decided to search for this kind of galaxy. The First Byurakan Survey commenced in 1965 using the Schmidt telescope at the Byurakan Astrophysical Observatory in Armenian SSR. The telescope used a 132 cm mirror and 102 cm correcting plate. When this st ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aladin2011
Aladdin is a folk tale of Middle Eastern origin. Aladdin, Aladin, and variants such as Aladdin and His Magic Lamp, may also refer to: Arts and entertainment Disney franchise * ''Aladdin'' (franchise) ** Aladdin (Disney character), protagonist of Disney's ''Aladdin'' franchise ** ''Aladdin'' (1992 Disney film), an animated film *** ''Aladdin'' (1992 soundtrack) ** ''Aladdin'' (2011 musical), based on the film ** ''Aladdin'' (animated TV series), 1994–1995 ** Disney's Aladdin: A Musical Spectacular, a Broadway-style show, 2003–2016 ** ''Disney's Aladdin'' (Capcom video game), 1993 ** ''Disney's Aladdin'' (Virgin Games video game), 1993 ** ''Disney's Aladdin'' (1994 video game), for Sega's 8-bit consoles ** ''Aladdin'' (2019 film), a live action adaptation of the 1992 film *** ''Aladdin'' (2019 soundtrack) Films * ''Aladdin and the Wonderful Lamp'' (1917 film), a silent film * "Aladdin and His Wonderful Lamp", a 1939 short film with Popeye as Aladdin * "Aladdin and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seyfert Galaxy
Seyfert galaxies are one of the two largest groups of active galaxies, along with quasars. They have quasar-like nuclei (very luminous, distant and bright sources of electromagnetic radiation) with very high surface brightnesses whose spectra reveal strong, high-ionisation emission lines, but unlike quasars, their host galaxies are clearly detectable. Seyfert galaxies account for about 10% of all galaxies and are some of the most intensely studied objects in astronomy, as they are thought to be powered by the same phenomena that occur in quasars, although they are closer and less luminous than quasars. These galaxies have supermassive black holes at their centers which are surrounded by accretion discs of in-falling material. The accretion discs are believed to be the source of the observed ultraviolet radiation. Ultraviolet emission and absorption lines provide the best diagnostics for the composition of the surrounding material. Seen in visible light, most Seyfert galaxies ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Markarian 501
Markarian 501 (or Mrk 501) is a galaxy with a spectrum extending to the highest energy gamma rays. It is a blazar or BL Lac object, which is an active galactic nucleus with a jet that is shooting towards the Earth. In the very-high-energy gamma ray region of the spectrum, at energies above 1011 eV (0.1 TeV), it is the brightest object in the sky. The object has a redshift of z = 0.034. The galaxy hosting the blazar was studied and catalogued by Benjamin Markarian in 1974. It was first determined to be a very high energy gamma ray emitter in 1996 by John Quinn at the Whipple Observatory. Galaxy The elliptical galaxy is located in the constellation of Hercules at right ascension 16h 53.9m and declination +39° 45'. Its visible size appears to be 1.2 by 1 minute of arc. Gamma rays The gamma rays from Mrk 501 are extremely variable, undergoing violent outbursts. The gamma ray spectrum of Mrk 501 shows two humps. One is below 1 keV and can be considered to be X-rays and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Markarian 421
Markarian 421 (Mrk 421, Mkn 421) is a blazar located in the constellation Ursa Major. The object is an active galaxy and a BL Lacertae object, and is a strong source of gamma rays. It is about 397 million light-year A light-year, alternatively spelled light year, is a large unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometers (), or 5.88 trillion miles ().One trillion here is taken to be 1012 ...s (redshift: z=0.0308 eq. 122M pc) to 434 million light-years (133Mpc) from the Earth. It is one of the closest blazars to Earth, making it one of the brightest quasars in the night sky. It is suspected to have a supermassive black hole (SMBH) at its center due to its active nature. An early-type high inclination spiral galaxy (Markarian 421-5) is located 14 arc-seconds northeast of Markarian 421. It was first determined to be a very high energy gamma ray emitter in 1992 by M. Punch at the Whipple Observatory, an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
UGC 12812
UGC may refer to: Science and technology * Universal gravitational constant G, in physics * Uppsala General Catalogue, an astronomical catalogue of galaxies * UGC, a codon for cysteine * Unique games conjecture, a conjecture in computational complexity Organisations * UGC (cinema operator), a European cinema chain, formerly Union Générale Cinématographique * UGC Fox Distribution, a former French-American film production company formed in 1995 * Union Graduate College, Schenectady, New York * United Grain Company, a Russian grain trading company based in Moscow * University Grants Commission (other) * University Grants Committee (other) * UnitedGlobalCom, former name of the cable TV operator Liberty Global * UnderGround Crips, an African American street gang mainly from Los Angeles, California Other * User-generated content, media content made by the general public * Urine Good Company, a fictional corporation in the musical ''Urinetown'' * Urgench Internation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Markarian 273
Markarian 273 is a galaxy merger located in the constellation Ursa Major. It is located at a distance of about 500 million light years from Earth, which, given its apparent dimensions, means that Markarian 273 is about 130,000 light years across. It is an ultraluminous infrared galaxy and a Seyfert galaxy. Characteristics Markarian 273 is a galaxy merger, the result of two or more galaxies colliding. When observed in mid infrared, two nuclei are visible, with a projected separation of about 0.75 kiloparsec. The southwest nucleus is known to be active, due its X-ray emission, while the northeast nucleus too displays a heavily abosrbed X-ray spectrum, indicating that is also active. The optical emission of the southwest nucleus corresponds to a type II Seyfert galaxy while the north one of a LINER. A third component in the nuclear region is visible at the southeast in the radiowaves and could be a star cluster. The galaxy experiences a starburst, with a star formation rate of 13 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NGC 5256
NGC 5256 is an object that contains two disc galaxies, that are colliding into each other. It is located in the constellation Ursa Major, and was discovered by William Herschel on 12 May 1787. The two nuclei of the galaxies are separated by about 13,000 light-years. The southwest and northeast nuclei have masses of and , assuming they orbit around a common center of mass. NGC 5256 is located at about 420 million light-years away from the Earth. NGC 5256 is also known as Markarian 266 and is one of the Markarian galaxies, included in the Markarian Survey due to its high amount of ultraviolet emission. However, it is also a luminous infrared galaxy (LIRG); most of its energy is emitted in the infrared range. See also * List of NGC objects (5001–6000) * List of NGC objects The following is a list of NGC objects, that is objects listed in the New General Catalogue (NGC). It is one of the largest comprehensive astronomical catalogues for deep sky objects such as star clusters, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Markarian 231
Markarian 231 (UGC 8058) is a Type-1 Seyfert galaxy that was discovered in 1969 as part of a search of galaxies with strong ultraviolet radiation. It contains the nearest known quasar. Markarian 231 is located about 581 million light years away from Earth, in the constellation of Ursa Major. Characteristics The Markarian 231 galaxy is undergoing an energetic starburst. A nuclear ring of active star formation has been found in the center with a rate of formation greater than 100 solar masses per year. It is one of the most ultraluminous infrared galaxies with power derived from an accreting black hole in the center and the closest known quasar. A study in 2015 suggested that the central black hole, estimated to be 150 million times the mass of the Sun, may have a black hole companion weighing in at 4 million solar masses, and that the duo completed an orbit around each other every 1.2 years. However, that model has subsequently been shown to be unfeasible. Another study has foun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Markarian 209 .
I Zwicky 36, often abbreviated to I Zw 36, is a galaxy in the constellation of Canes Venatici. It is located at a distance of about 5.8 megaparsecs from the Milky Way. I Zwicky 36 is an irregular galaxy, specifically a blue compact dwarf galaxy. These galaxies are small, and have high rates of star formation, making them appear bluish in color. The dominant population of stars in I Zw 36 is young in stellar terms, with ages of under 3 million years. It is quite isolated: the nearest galaxy is Messier 94 (NGC 4736) which is about 1.4 megaparsecs away, although the galaxy may have experienced a merger in the past that could explain its current burst of star formation Star formation is the process by which dense regions within molecular clouds in The "medium" is present further soon.-->interstellar space References |
NGC 4319
NGC 4319 is a face-on barred spiral galaxy located about 77 million light years away in the constellation Draco. The morphological classification is SB(r)ab, which indicates it is a barred spiral with an inner ring structure and moderate to tightly wound arms. It is situated in physical proximity to the galaxies NGC 4291 and NGC 4386, with X-ray emissions from the intervening gap indicating NGC 4319 and NGC 4291 may be interacting. NGC 4319 has a much higher proportion of ionized hydrogen compared to the Milky Way galaxy. In 1971, American astronomer Halton Arp noted what appeared to be a physical connection between NGC 4319 and Markarian 205, a quasi-stellar object with a much higher redshift. He suggested that if Markarian 205 is not an accidentally projected background object, then it may instead have been ejected from the nucleus of this galaxy. The discovery of an apparent luminous connection between the two created a storm of controversy as astronomers sought to refute the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arp 299
Arp 299 (parts of it are also known as IC 694 and NGC 3690) is a pair of colliding galaxies approximately 134 million light-years away in the constellation Ursa Major. Both of the galaxies involved in the collision are barred irregular galaxies. It is not completely clear which object is historically called ''IC 694''. According to some sources, the small appendage more than an arcminute northwest of the main pair is actually IC 694, not the primary (eastern) companion. The interaction of the two galaxies in Arp 299 produced young powerful starburst regions similar to those seen in II Zw 96. Nine supernovae have been detected in Arp 299: SN 1992bu, SN 1993G, SN 1998T, SN 1999D, SN 2020fkb, SN 2022gnp were observed in NGC 3690 while SN 2005U, SN 2010O and SN 2010P were observed in IC 694.2010O in NGC 3690 (David Bi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quasar
A quasar is an extremely Luminosity, luminous active galactic nucleus (AGN). It is pronounced , and sometimes known as a quasi-stellar object, abbreviated QSO. This emission from a galaxy nucleus is powered by a supermassive black hole with a mass ranging from millions to tens of billions of solar masses, surrounded by a gaseous accretion disc. Gas in the disc falling towards the black hole heats up because of friction and releases energy in the form of electromagnetic radiation. The radiant energy of quasars is enormous; the most powerful quasars have luminosity, luminosities thousands of times greater than that of a galaxy such as the Milky Way. Usually, quasars are categorized as a subclass of the more general category of AGN. The redshifts of quasars are of Expansion of the universe, cosmological origin. The term originated as a Contraction (grammar), contraction of "quasi-stellar ''[star-like]'' radio source"—because quasars were first identified during the 1950s as sour ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
