Spiral galaxy with a central bar-shaped structure composed of stars
NGC 1300, viewed nearly face-on; Hubble Space Telescope image
A barred spiral galaxy is a spiral galaxy with a central bar-shaped structure composed of stars.[1] Bars are found in about two thirds of all spiral galaxies in the local universe,[2] and generally affect both the motions of stars and interstellar gas within spiral galaxies and can affect spiral arms as well.[3][4] The Milky Way Galaxy, where the Solar System is located, is classified as a barred spiral galaxy.[5]
Edwin Hubble classified spiral galaxies of this type as "SB" (spiral, barred) in his Hubble sequence and arranged them into 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 the two. SB0 is a barred lenticular galaxy. A new type, SBm, was subsequently created to describe somewhat irregular barred spirals, such as the Magellanic Clouds, which were once classified as irregular galaxies, but have since been found to contain barred spiral structures. Among other types in Hubble's classifications for the galaxies are the spiral galaxy, elliptical galaxy and irregular galaxy.
Although theoretical models of galaxy formation and evolution had not previously expected galaxies becoming stable enough to host bars very early in the universe's history, evidence has recently emerged of the existence of numerous spiral galaxies in the early universe.[6][7][8]
A barredspiralgalaxy is a spiralgalaxy with a central bar-shaped structure composed of stars. Bars are found in about two thirds of all spiral galaxies...
Hururyry Spiralgalaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae and, as such, form part...
individually distinguished by the naked eye. The Milky Way is a barredspiralgalaxy with a D25 isophotal diameter estimated at 26.8 ± 1.1 kiloparsecs...
galaxies. Galaxies are categorized according to their visual morphology as elliptical, spiral, or irregular. The Milky Way is an example of a spiral galaxy...
spiralgalaxy is a type of spiralgalaxy without a central bar, or one that is not a barredspiralgalaxy. It is designated with an SA in the galaxy morphological...
Lists of astronomical objects List of galaxies Spiralgalaxy Normandin, George (2002). "BarredSpiralGalaxy NGC 1090". Retrieved Dec. 26, 2006 Matthews...
The Andromeda Galaxy is a barredspiralgalaxy and is the nearest major galaxy to the Milky Way. It was originally named the Andromeda Nebula and is cataloged...
weakly barredspirals. Lenticular galaxies are also classified as unbarred (SA0) or barred (SB0), with the notation S0 reserved for those galaxies for which...
An intermediate spiralgalaxy is a galaxy that is in between the classifications of a barredspiralgalaxy and an unbarred spiralgalaxy. It is designated...
Messier 83 or M83, also known as the Southern Pinwheel Galaxy and NGC 5236, is a barredspiralgalaxy approximately 15 million light-years away in the constellation...
NGC 1300 is a barredspiralgalaxy located about 61 million light-years away in the constellation Eridanus. The galaxy is about 110,000 light-years across...
Great BarredSpiralGalaxy, is a double-barredspiralgalaxy about 75 million light-years away in the constellation Fornax. NGC 1365 is a large barred spiral...
A lenticular galaxy (denoted S0) is a type of galaxy intermediate between an elliptical (denoted E) and a spiralgalaxy in galaxy morphological classification...
A barred irregular galaxy is an irregular version of a barredspiralgalaxy. Examples include the Large Magellanic Cloud and NGC 6822. Some barred irregular...
satellite galaxy disturbing the primary galaxy'sspiral arms. An example of a major interaction is a galactic collision, which may lead to a galaxy merger...
M61, NGC 4303, or the Swelling SpiralGalaxy) is an intermediate barredspiralgalaxy in the Virgo Cluster of galaxies. It was first discovered by Barnaba...
Eye Galaxy (also called Sleeping Beauty Galaxy or Evil Eye Galaxy and designated Messier 64, M64, or NGC 4826) is a relatively isolated spiralgalaxy 17 million...
Messier 77 (M77), also known as NGC 1068 or the Squid Galaxy, is a barredspiralgalaxy in the constellation Cetus. It is about 47 million light-years...
some references describe M94 as a barredspiralgalaxy, the "bar" structure appears to be more oval-shaped. The galaxy has two ring structures. M94 is classified...
phenomenon where the rotational velocity of the bar in a barredspiralgalaxy increases to the point of spiral spin-out. Under typical conditions, gravitational...
NGC 3628 is instead a barredspiralgalaxy with the bar seen end-on. Simulations have shown that bars often form in disk galaxies during interactions and...
The Tadpole Galaxy, also known as UGC 10214 and Arp 188, is a disrupted barredspiralgalaxy located 420 million light-years from Earth in the northern...
A dwarf spiralgalaxy is the dwarf version of a spiralgalaxy. Dwarf galaxies are characterized as having low luminosities, small diameters (less than...
Messier 58 (also known as M58 and NGC 4579) is an intermediate barredspiralgalaxy with a weak inner ring structure located within the constellation Virgo...
it a barredspiral with well-defined arms. Examples of regular spiralgalaxies: (visually) M31 (Andromeda Galaxy), M74, M81, M104 (Sombrero Galaxy), M51a...
The Pinwheel Galaxy (also known as Messier 101, M101 or NGC 5457) is a face-on spiralgalaxy located 21 million light-years (6.4 megaparsecs) from Earth...
Messier 95, also known as M95 or NGC 3351, is a barredspiralgalaxy about 33 million light-years away in the zodiac constellation Leo. It was discovered...
been classified as an active starburst galaxy. NGC 6946 has also been classified as a double-barredspiralgalaxy, with the inner, smaller bar presumably...
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