barred spiral galaxy A kind of rod-like structure of spiral galaxies through galactic nuclei. In the galaxy classification, the symbol sb said, to distinguish them from normal spiral galaxies s. In the day of the bright galaxies, barred spiral galaxy about 15% when the statistics to the dark galaxies, barred spiral galaxy to increase the ratio to 25%. Barred spiral galaxy in terms of quality, brightness and spectrum, in the members of the family type of celestial stars, gas and dust distribution of galaxies and galaxy disk and the halo structure of the spatial distribution of features, etc., and normal spiral galaxies are similar. Barred spiral galaxy in sports is characterized by: a common core of fast rotating massive body, the state of motion and space complex structure, rod-like structures within and near the gas and stars have a non-circular motion; galactic disk in external galaxies seem to home main position, the quality of a large part of the Department astrology. Barred spiral galaxies have a number of basic issues to be resolved, such as rod-like structure is formed, its evolution in galaxies such as what role.
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Classification
棒旋星系 分类
According to Hubble's classification and the classification Woku Luo, barred spiral galaxy can be divided into three categories: ① normal barred spiral galaxy sba, sbb, and sbc; ② lens-type barred spiral galaxy sb0; ③ irregular barred spiral galaxy sbd and sbm. Normal barred spiral galaxy is characterized by a marked rod-like structure, spiral arms extending from the rod end, usually with rods 90 degrees. Spiral arms start from a to c more. sba sbb rod-like structure and smooth, and sbc rod body and the spiral arms are visible bright stars, bright lights section or group. Lens-type barred spiral galaxies and elliptical galaxies sb0 the difference is not arm it's shape like the Greek letter Θ, the center has a bright nucleus, a circle outside the core of dark and light of heart and nuclear lens type galactic disk, stick two ends of the general body of the plate around to pay on top. Barred spiral galaxy sbd irregular rod-like structure and sbm not necessarily in the center of the galaxy. Rod-like structure of the luminosity of the galaxy luminosity about 10 to 20%; red color more often than the arms.
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Example
Name Type of the Zodiac dwingeloo 1 sbb Cassiopeia m58 sbc Virgo m91 sbb Coma Berenices m95 sbb Leo m109 sbb Ursa Major maffei 2 sbb Cassiopeia Galaxy sbbc (our own galaxy belongs) ngc 55 sbc Cetus ngc 1300 sbbc Eridanus ngc 1365 sbc Fornax ngc 253 sbc Sculptor m83 (South windmill Galaxy) sabc Hydra
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Related observation
NASA (nasa) Hubble Space Telescope has recently taken to a barred spiral-shaped galaxy, this galaxy about 30 million light-years from Earth in the constellation of the clock (horologium constellation) inside. Barred spiral-shaped galaxy (barred spiral galaxy) is the center of elongated rod-shaped spiral galaxy (spiral galaxy), the general center of spiral galaxies there is a round core, the center of barred spiral galaxy is shaped rod shape, stick either side of the spiral-shaped arm stretched out. See the figure, scientists using the Hubble Space Telescope (hubble space telescope) to capture barred spiral-shaped galaxy ngc 1512 photos, this galaxy 70 000 light years in diameter, almost equal to the galaxy (milky way) width. Scientists point out that the ring around the galaxy, a star is born of the zone, this zone there are two thousand four hundred light-years wide.
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Example
棒旋星系 例子
Name Type of the Zodiac Virgo M91SBb Dwingeloo 1SBb Cassiopeia M58SBc M95SBb Coma Berenices Leo M109SBb Maffei 2SBb Cassiopeia Ursa Major galaxy SBbc (our own galaxy belongs) NGC 55SBc Cetus NGC 1300SBbc Eridanus NGC 1365SBc Fornax NGC 253SBc Sculptor M83 (Southern Pinwheel Galaxy) SABc Hydra
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Barred spiral galaxy - Messier 109
棒旋星系-梅西尔109
Messier 109 (the M109, also known as NGC 3992) is a barred spiral in Ursa Major galaxy, a distance of about 41 million light years. M109 is the Ursa Major cluster of galaxies in the northern most galaxy, along with Messier 108. M109 via small telescopes away from the DNT (Compass III Ursa γ) 40 ', the place to find the azimuth 120 º. Messier 109 Messier 109 by the Pierre Méchain discovered in 1781, Charlie Meadow Sylvain him in 1783 incorporated into the directory. Between 1920 to the 1950s was officially recognized only the 103 Messier objects, in the later years of these new additions was widely accepted. David Levi (David Levy) of the 110 objects mentioned in the modern, was Sir Patrick Moore to provide the most original 104 objects, and lists the M105-M109 as an appendix. To the late 1970s to now, 110 Messier objects on the total number of widely used by astronomers. Barred spiral galaxy M109 is the standard sample in 2005, our Milky Way galaxy has been found to be similar with the M109. M109 has three companion galaxy (UGC 6923, UGC 6940 and UGC 6969), and its companion galaxy M109 observed that a significant hydrogen line, and may have more lines in the more detailed observations revealed. M109 rules of the HI distribution is extended to low-level radiation to the satellite dish outside the shape, the bar area is very clear. In the center of the H Ⅰ presents the distribution of hollow, rod-like structure may be a large number of gas transmission, or the accumulation of events in the past failed to accumulate a large amount of gas in the center of the hole was produced. In March 1956, M109 galaxy within the south-east of the supernova SN 1956 A was found. Luminosity by the discovery of 12.8 and so on to the brightest time of 12.3 and so on. It was a star of type 1a supernovae, and so far only found in the M109 a supernova.
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百科 Daquan
棒旋星系 百科大全
棒旋星系 百科大全
bangxuan xingxi Barred spiral galaxy barred spiral galaxy A kind of rod-like structure throughout the galaxy nuclear spirals. In the classification of galaxies in order to sign SB said, as distinct from normal spiral galaxies S. In the day of the bright galaxies, barred spiral galaxy about 15%. When the statistics to the dark galaxies, the proportion of barred spiral galaxies, the number increased to 25%. Barred spiral galaxy in terms of quality, brightness, spectrum, in the members of the family type of celestial stars, gas and dust distribution of galaxies and galaxy disk and the halo structure of the spatial distribution of features, etc., are similar to normal spiral galaxies. According to the classification and Wo Kule Hubble classification, barred spiral galaxy can be divided into three categories: ① normal barred spiral galaxies SBa, SBb and SBc; ② lens-type barred spiral galaxy SB0; ③ and irregular barred spiral galaxy SBd SBm. Normal barred spiral galaxy is characterized by a marked rod-like structure, spiral arms extending from the rod end, usually with rods 90 degrees. Arm type from a to c more times to start. SBa SBb rod-like structure and smooth, and SBc spiral arm of the rod body and the bright stars are visible, bright lights section or group. SB0 lens-type barred spiral galaxy and elliptical galaxies, the difference is a rod-like structure, with the normal barred spiral galaxies SBa difference then there is no spiral arms. Its shape is like the Greek letter □, that center has a bright nucleus, a circle outside the core of dark and light were the heart and nuclear lens galaxy disk, stick two ends of the general body of the plate around to pay on top. Barred spiral galaxy SBd irregular rod-like structure and SBm not necessarily in the center of the galaxy, the spiral structure of the irregularities from d to m increments. Rod-like structure of the luminosity of the galaxy luminosity about 10 to 20%; red color more often than the arms. Barred spiral galaxy in the movement's main features are: ① often a core of fast rotating massive body, the state of motion and space complex; ② rod-like structure within and near the gas and stars have a non-circular motion; ③ in the galactic disk external galaxies seem to position the main home, a large part of the quality of astrological system, the rotation may be of a differential rotation. Barred spiral galaxy (NGC1300) Barred spiral galaxy there are many fundamental issues to be resolved, for example, rod-like structure is formed, its evolution in galaxies such as what role. (Xu □)
