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Norma Arm

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), which lies outside the Perseus Arm, or the Outer Arm, which is located farther away from the center of the Galaxy than the Cygnus Arm.[1] The Norma Arm begins 2.2 kpc from the Galactic Center,[2] and extends outward to a radius of 15.5±2.8 kpc. It is named for the Norma constellation, through which the Arm as seen from Earth passes.

Diagram of the Milky Way's spiral arms

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.

Because of localised gravitational variations, the spiral pattern has itself formed several distinct 'spiral arms', where particularly large numbers of stars can be found.[1]

See also

References

  1. ^ a b c Churchwell, Ed; Babler, Brian L.; Meade, Marlin A. (2009). "The Spitzer/GLIMPSE Surveys: A New View of the Milky Way" (PDF). Publications of the Astronomical Society of the Pacific. 121 (877): 213–230. Bibcode:2009PASP..121..213C. doi:10.1086/597811. S2CID 15529740.
  2. ^ Vallée, Jacques P. (September 2017). "The Norma spiral arm: large-scale pitch angle". Astrophysics and Space Science. 362 (9): 5. arXiv:1708.07189. Bibcode:2017Ap&SS.362..173V. doi:10.1007/s10509-017-3145-5. S2CID 254256961. 173.

norma, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, scholar, jstor, december, 2009, lear. This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Norma Arm news newspapers books scholar JSTOR December 2009 Learn how and when to remove this template message 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 which lies outside the Perseus Arm or the Outer Arm which is located farther away from the center of the Galaxy than the Cygnus Arm 1 The Norma Arm begins 2 2 kpc from the Galactic Center 2 and extends outward to a radius of 15 5 2 8 kpc It is named for the Norma constellation through which the Arm as seen from Earth passes Diagram of the Milky Way s spiral arms 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 Because of localised gravitational variations the spiral pattern has itself formed several distinct spiral arms where particularly large numbers of stars can be found 1 See also EditGalactic discReferences Edit a b c Churchwell Ed Babler Brian L Meade Marlin A 2009 The Spitzer GLIMPSE Surveys A New View of the Milky Way PDF Publications of the Astronomical Society of the Pacific 121 877 213 230 Bibcode 2009PASP 121 213C doi 10 1086 597811 S2CID 15529740 Vallee Jacques P September 2017 The Norma spiral arm large scale pitch angle Astrophysics and Space Science 362 9 5 arXiv 1708 07189 Bibcode 2017Ap amp SS 362 173V doi 10 1007 s10509 017 3145 5 S2CID 254256961 173 Portals Stars Spaceflight Outer space Solar System Retrieved from https en wikipedia org w index php title Norma Arm amp oldid 1138514754, wikipedia, wiki, book, books, library,

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