|
A barred spiral galaxy is a spiral galaxy with a band of bright stars emerging from the center and running across the middle of the galaxy. Spiral arms appear to emerge from the ends of the "bar" in these galaxies, whereas they appear to emerge directly from the core in ordinary spiral galaxies. Image File history File linksMetadata Download high resolution version (6637x3787, 9906 KB) Barred spiral galaxy NGC 1300 Photographed by Hubble telescope In the core of the larger spiral structure of NGC 1300, the nucleus shows its own extraordinary and distinct grand-design spiral structure that is about 3,300 light...
Image File history File linksMetadata Download high resolution version (6637x3787, 9906 KB) Barred spiral galaxy NGC 1300 Photographed by Hubble telescope In the core of the larger spiral structure of NGC 1300, the nucleus shows its own extraordinary and distinct grand-design spiral structure that is about 3,300 light...
NGC 1300 NGC 1300 is a Barred Spiral Galaxy in the Constellation Eridanus. ...
The Hubble Space Telescope (HST) is a telescope in orbit around the Earth, named after astronomer Edwin Hubble for his discovery of galaxies outside the Milky Way and his creation of Hubbles Law, which calculates the rate at which the universe is expanding. ...
NGC 253, a barred spiral starburst galaxy. ...
NGC 253, a barred spiral starburst galaxy. ...
Spiral Galaxy NGC 256, the Sculptor Galaxy. ...
A spiral galaxy is a type of galaxy in the Hubble sequence which is characterized by the following physical properties: Spiral Galaxy M74 presents a face-on view of its spiral arms. ...
The Pleiades, an open cluster of stars in the constellation of Taurus. ...
NGC 4414, a typical spiral galaxy in the constellation Coma Berenices, is about 56,000 light years in diameter and approximately 60 million light years distant. ...
A spiral galaxy presents a face-on view of its spiral arms. ...
Edwin Hubble classified these types of spiral galaxies as "SB" ("Spiral", "Barred") in his Hubble sequence, and arranged them into three sub-categories based on how open the arms of the spiral are. SBa types feature tightly bound arms, while SBc types are at the other extreme and have loosely bound arms. SBb type galaxies lie in between. A fourth type, SBm, was subsequently created to describe somewhat irregular barred spirals, such as the Magellanic Cloud galaxies, which were once classified as irregular galaxies, but have since been found to contain barred spiral structures. Edwin Hubble Edwin Powell Hubble (November 20, 1889 – September 28, 1953) was an American astronomer, noted for his discovery of galaxies beyond the Milky Way and the cosmological redshift. ...
Philosophers sometimes distinguish classes from types and kinds. ...
Astronomers classify galaxies based on their overall shape (elliptical, spiral or barred spiral) and further by the specific properties of the individual galaxy (for example degree of ellipse, number of spirals or definition of bar). ...
NGC1427A, an example of an irregular galaxy. ...
The two Magellanic Clouds are irregular dwarf galaxies orbiting our Milky Way galaxy, and thus are members of our Local Group of galaxies. ...
In 2005, observations by the Spitzer Space Telescope backed up previously collected evidence that suggested the Milky Way is a barred spiral galaxy. Observations by radio telescopes had for years suggested our galaxy to be barred, but Spitzer's vision in the infrared region of the spectrum has provided a more definite calculation. 2005 (MMV) was a common year starting on Saturday of the Gregorian calendar. ...
The Spitzer Space Telescope Facility launches from Cape Canaveral Air Force Station in Florida on Monday, Aug. ...
The Milky Way (a translation of the Latin Via Lactea, in turn derived from the Greek Γαλαξίας (Galaxias), sometimes referred to simply as the Galaxy), is a barred spiral galaxy of the Local Group. ...
The 64 metre radio telescope at Parkes Observatory The Very Large Array, an interferometric array formed from many smaller telescopes, like many larger radio telescopes. ...
A year is the time between two recurrences of an event related to the orbit of the Earth around the Sun. ...
The Spitzer Space Telescope Facility launches from Cape Canaveral Air Force Station in Florida on Monday, Aug. ...
Image of a small dog taken in mid-infrared (thermal) light (false color) Infrared (IR) radiation is electromagnetic radiation of a wavelength longer than that of visible light, but shorter than that of radio waves. ...
Legend: γ = Gamma rays HX = Hard X-rays SX = Soft X-Rays EUV = Extreme ultraviolet NUV = Near ultraviolet Visible light NIR = Near infrared MIR = Moderate infrared FIR = Far infrared Radio waves: EHF = Extremely high frequency (Microwaves) SHF = Super high frequency (Microwaves) UHF = Ultra high frequency VHF = Very high frequency HF = High...
A calculation is a deliberate process for transforming one or more inputs into one or more results. ...
The bars
Barred spiral galaxies are relatively common, with surveys showing that up to two-thirds of all spiral galaxies contain a bar.[1] The current hypothesis is that the bar structure acts as a type of stellar nursery, fueling star birth at their centers. The bar is thought to act as a mechanism that channels gas inwards from the spiral arms through orbital resonance, in effect funneling the flow to create new stars.[2] This process is also thought to explain why many barred spiral galaxies have active galactic nuclei, such as that seen in the Southern Pinwheel Galaxy. A hypothesis (from Greek ) is a suggested explanation of a phenomenon or reasoned proposal suggesting a possible correlation between multiple phenomena. ...
A stellar nursery is a massive cosmic dust cloud in which microscopic particles may slowly aggregate due to gravitational attraction and eventually give rise to protostars and subsequently planetary systems, with one or more stars and planets. ...
In astronomy, stellar evolution is the sequence of changes that a star undergoes during its lifetime; the hundreds of thousands, millions or billions of years during which it emits light and heat. ...
A gas is one of the four major phases of matter (after solid and liquid, and followed by plasma, that subsequently appear as a solid material is subjected to increasingly higher temperatures. ...
An active galaxy is a galaxy where a significant fraction of the energy output is not emitted by the normal components of a galaxy: stars, dust and interstellar gas. ...
Messier Object 83, the Southern Pinwheel Galaxy. ...
The creation of the bar is generally thought to be the result of a density wave radiating from the center of the galaxy whose effects reshape the orbits of the inner stars. This effect builds over time to stars orbiting further out, which creates a self-perpetuating bar structure.[3] Another possible culprit in bar creation are tidal disruptions between galaxies.
Bars are thought to be a temporary phenomenon in the life of spiral galaxies, the bar structure decaying over time, transforming the galaxy from a barred spiral to a "regular" spiral pattern. Past a certain size the accumulated mass of the bar compromises the stability of the overall bar structure. Barred spiral galaxies with high mass accumulated in their center tend to have short, stubby bars. [1]. Since so many spiral galaxies have a bar structure, it is likely that it is a recurring phenomenon in spiral galaxy development.
The bulges Studying the core of the Milky Way, scientists found out that the Milky Way's bulge was peanut-shaped. This led to the conclusion that all barred spiral galaxies have a peanut shaped bulge. When observing a distant spiral galaxy with a rotational axis perpendicular to the line of sight, or one that appears "edge-on" to the observer, the shape of the bulge can be easily observed, and therefore quickly classified as either a barred spiral or a regular spiral. Galaxy NGC 4565 has been classified as a barred spiral galaxy using this method. In astronomy, a bulge is a huge, tightly packed group of stars. ...
Binomial name Arachis hypogaea L. The peanut, or groundnut (Arachis hypogaea) is a species in the legume family Fabaceae native to South America. ...
NGC 4565 is an edge-on barred spiral galaxy about 49 million light-years away in the constellation Coma Berenices. ...
Examples Astronomers classify galaxies based on their overall shape (elliptical, spiral or barred spiral) and further by the specific properties of the individual galaxy (for example degree of ellipse, number of spirals or definition of bar). ...
This article or section does not cite its references or sources. ...
M58, courtesy of NOAO, taken in April of 1998 at the Kitt Peak 0. ...
See VIRGO (physics) for a French-Italian project in physics. ...
Spiral Galaxy M91. ...
Coma Berenices (Latin for Berenices Hair) is a traditional asterism that has since become a constellation. ...
The Spiral Galaxy M95 (also known as Messier Object 95, Messier 95, M95, or NGC 3351) is a spiral galaxy (type SBb) in the constellation Leo. ...
Leo (IPA: , Latin: , symbol , ) is a constellation of the zodiac. ...
The Spiral Galaxy M109 (also known as Messier Object 109, Messier 109, M109, or NGC 3992) is a spiral galaxy in the Ursa Major constellation. ...
Ursa Major (IPA: ) is a constellation visible throughout the year in most of the northern hemisphere. ...
NGC 1300 is a barred spiral galaxy in the constellation Eridanus. ...
Eridanus is the sixth largest of the 88 modern constellations. ...
NGC 1365 (nicknamed the Great Barred Spiral Galaxy) is a giant barred spiral galaxy about 60 million light-years away in the constellation Fornax. ...
Fornax (Latin for furnace) is a southern constellation which was first introduced by Nicolas Louis de Lacaille under the name Fornax Chemica (Latin for chemical furnace). ...
See also An active galaxy is a galaxy where a significant fraction of the energy output is not emitted by the normal components of a galaxy: stars, dust and interstellar gas. ...
A dwarf galaxy is a small galaxy composed of up to several billion stars, a small number compared to our own Milky Ways 200-400 billion stars. ...
Dwarf elliptical galaxies are elliptical galaxies that are much smaller than others, classified as dE. They are quite common, and are usually companions to other galaxies. ...
Dwarf spheroidal galaxy (dSph) is a term in astronomy applied to the nine low luminosity dwarf elliptical galaxies that are companions to the Milky Way and to the similar systems that are companions to the Andromeda Galaxy M31. ...
An elliptical galaxy is a type of galaxy in the Hubble sequence characterized by the following physical properties: The giant elliptical galaxy NGC 4881 (the spherical glow at upper left) lies at the edge of the Coma Cluster of Galaxies. ...
Astronomers classify galaxies based on their overall shape (elliptical, spiral or barred spiral) and further by the specific properties of the individual galaxy (for example degree of ellipse, number of spirals or definition of bar). ...
REDIRECT [[ --68. ...
Galaxy groups and clusters are super-structures in the spread of galaxies of the cosmos. ...
NGC1427A, an example of an irregular galaxy. ...
The Spindle Galaxy (NGC 5866), a lenticular galaxy in the Draco constellation. ...
List of galaxies: Abell 1835 IR1916 AM 0644-741 Andromeda Galaxy (M31/NGC 224) Andromeda I Andromeda II Andromeda III Aquarius Dwarf Barnards Galaxy (NGC 6822) Black Eye Galaxy (M64/NGC 4826) Bodes Galaxy (M81/NGC 3031) Canis Major Dwarf Galaxy Carina Dwarf Centaurus A Galaxy Draco Dwarf Fornax...
It has been suggested that List of satellites of the Milky Way be merged into this article or section. ...
A ring galaxy is a galaxy with a ring-like appearance. ...
A spiral galaxy is a type of galaxy in the Hubble sequence which is characterized by the following physical properties: Spiral Galaxy M74 presents a face-on view of its spiral arms. ...
A starburst galaxy is a galaxy in the process of an intense burst of star formation, often as a result of a collision or close encounter between two galaxies. ...
Seyfert galaxies are spiral or irregular galaxies containing an extremely bright nucleus, most likely caused by a supermassive black hole, that can sometimes outshine the surrounding galaxy. ...
Timeline of galaxies, clusters of galaxies, and large-scale structure of the cosmos 964 - Al Sufi, a Persian astronomer makes the first preserved recording of the Large Magellanic Cloud. ...
References - ^ P. B. Eskridge, J. A. Frogel (1999). "What is the True Fraction of Barred Spiral Galaxies?". Astrophysics and Space Science 269/270: 427-430.
- ^ J. H. Knapen, D. Pérez-Ramírez, S. Laine (2002). "Circumnuclear regions in barred spiral galaxies - II. Relations to host galaxies". Monthly Notice of the Royal Astronomical Society 337 (3): 808-828.
- ^ F. Bournaud, F. Combes (2002). "Gas accretion on spiral galaxies: Bar formation and renewal". Astronomy and Astrophysics 392: 83-102.
External links |
Feeds |
Contact