Norma Arm: Difference between revisions
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{{Short description|Minor spiral arm of the Milky Way galaxy}} | {{Short description|Minor spiral arm of the Milky Way galaxy}} | ||
The '''Norma Arm''' is a minor [[spiral arm]] of the [[Milky Way]] extending from and around its central hub region.<ref name=Churchwell2009>{{cite journal|last=Churchwell|first=Ed|author2=Babler, Brian L. |author3=Meade, Marlin A. |title=The Spitzer/GLIMPSE Surveys: A New View of the Milky Way|journal=Publications of the Astronomical Society of the Pacific|year=2009|volume=121|issue=877 |pages=213–230|doi=10.1086/597811|url=http://www.astro.wisc.edu/sirtf/Churchwell_2009.pdf|bibcode=2009PASP..121..213C|s2cid=15529740 }}</ref> The inner portion of the Arm is called the ''Norma Arm'' in narrow meaning. The outer end of it is identified either with the '''Cygnus Arm''' (not to be confused with local and minor [[Orion-Cygnus Arm]]), | The '''Norma Arm''' is a minor [[spiral arm]] of the [[Milky Way]] extending from and around its central hub region.<ref name=Churchwell2009>{{cite journal|last=Churchwell|first=Ed|author2=Babler, Brian L. |author3=Meade, Marlin A. |title=The Spitzer/GLIMPSE Surveys: A New View of the Milky Way|journal=Publications of the Astronomical Society of the Pacific|year=2009|volume=121|issue=877 |pages=213–230|doi=10.1086/597811|url=http://www.astro.wisc.edu/sirtf/Churchwell_2009.pdf|bibcode=2009PASP..121..213C|s2cid=15529740 }}</ref> The inner portion of the Arm is called the ''Norma Arm'' in narrow meaning. The outer end of it is identified either with the '''Cygnus Arm''' (not to be confused with local and minor [[Orion-Cygnus Arm]]), that lies outside the [[Perseus Arm]], or the '''Outer Arm''', which is located further away from the center of the Galaxy than the Cygnus Arm.<ref name=Churchwell2009/> The Norma Arm begins {{Val|2.2|ul=kpc}} from the [[Galactic Center]],<ref name=Vallée2017>{{cite journal | title=The Norma spiral arm: large-scale pitch angle | last=Vallée | first=Jacques P. | journal=Astrophysics and Space Science | volume=362 | issue=9 | id=173 | pages=5 | date=September 2017 | doi=10.1007/s10509-017-3145-5 | arxiv=1708.07189 | bibcode=2017Ap&SS.362..173V | s2cid=254256961 }}</ref> and extends outward to a radius of {{Val|15.5|2.8|u=kpc}}. It is named for the [[Norma (constellation)|Norma]] constellation, through which the Arm as seen from Earth passes. | ||
Like many other galaxies of similar type, the Milky Way consists of a large mass of [[star]]s shaped into the form of a relatively flat disc by [[gravity]]. The disc is rotating, with the dense central body of stars moving at greater speeds than those toward the rim of the disc. | Like many other galaxies of similar type, the Milky Way consists of a large mass of [[star]]s shaped into the form of a relatively flat disc by [[gravity]]. The disc is rotating, with the dense central body of stars moving at greater speeds than those toward the rim of the disc. As a result, the pattern of stars within the Galaxy as viewed from directly above or below the disc has formed into a spiral. | ||
Due to localised gravitational variations, the spiral pattern has formed several distinct 'spiral arms', where particularly large numbers of stars can be found.<ref name=Churchwell2009/> | |||
==See also== | ==See also== | ||
Latest revision as of 07:28, 20 November 2025
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The Norma Arm is a minor spiral arm of the Milky Way extending from and around its central hub region.[1] The inner portion of the Arm is called the Norma Arm in narrow meaning. The outer end of it is identified either with the Cygnus Arm (not to be confused with local and minor Orion-Cygnus Arm), that lies outside the Perseus Arm, or the Outer Arm, which is located further away from the center of the Galaxy than the Cygnus Arm.[1] The Norma Arm begins Script error: No such module "val". from the Galactic Center,[2] and extends outward to a radius of Script error: No such module "val".. It is named for the Norma constellation, through which the Arm as seen from Earth passes.
Like many other galaxies of similar type, the Milky Way consists of a large mass of stars shaped into the form of a relatively flat disc by gravity. The disc is rotating, with the dense central body of stars moving at greater speeds than those toward the rim of the disc. As a result, the pattern of stars within the Galaxy as viewed from directly above or below the disc has formed into a spiral.
Due to localised gravitational variations, the spiral pattern has formed several distinct 'spiral arms', where particularly large numbers of stars can be found.[1]
See also
References
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