The Scutum–Centaurus Arm, also known as Scutum-Crux arm, is a long, diffuse curving streamer of stars, gas and dust that spirals outward from the proximate end of the Milky Way's central bar. The Milky Way has been posited since the 1950s to have four spiral arms — numerous studies contest or nuance this number.[1] In 2008, observations using the Spitzer Space Telescope failed to show the expected density of red clump giants in the direction of the Sagittarius and Norma arms.[2] In January 2014, a 12-year study into the distribution and lifespan of massive stars[3] and a 2013-reporting study of the distribution of masers and open clusters[4] both found corroboratory, though would not state irrefutable, evidence for four principal spiral arms.
The Scutum–Centaurus Arm lies between the minor Carina–Sagittarius Arm and the major Perseus Arm. The Scutum–Centaurus Arm starts near the core as the Scutum Arm, then gradually turns into the Centaurus Arm.[5]
The region where the Scutum–Centaurus Arm connects to the bar of the galaxy is rich in star-forming regions and open clusters. In 2006 a large cluster of new stars containing 14 red supergiant stars was discovered there and named RSGC1. In 2007 a cluster of approximately 50,000 newly formed stars named RSGC2 was located only a few hundred light years from RSGC1. It is thought to be less than 20 million years old and contains 26 red supergiant stars, the largest grouping of such stars known.[6] Other clusters in this region include RSGC3 and Alicante 8.[7]
^Bash, F. N. (1981). "Does the Galaxy have four spiral arms". The Astrophysical Journal. 250: 551. Bibcode:1981ApJ...250..551B. doi:10.1086/159401.
^Churchwell, E.; et al. (2009). "The Spitzer/GLIMPSE surveys: a new view of the Milky Way". Publications of the Astronomical Society of the Pacific. 121 (877): 213. Bibcode:2009PASP..121..213C. doi:10.1086/597811.
^Urquhart, J. S.; Figura, C. C.; Moore, T. J. T.; Hoare, M. G.; Lumsden, S. L.; Mottram, J. C.; Thompson, M. A.; Oudmaijer, R. D. (2013). "The RMS survey: Galactic distribution of massive star formation". Monthly Notices of the Royal Astronomical Society. 437 (2): 1791. arXiv:1310.4758. Bibcode:2014MNRAS.437.1791U. doi:10.1093/mnras/stt2006.
^Bobylev, V. V.; Bajkova, A. T. (2013). "The Milky Way spiral structure parameters from data on masers and selected open clusters". Monthly Notices of the Royal Astronomical Society. 437 (2): 1549. arXiv:1310.3974. Bibcode:2014MNRAS.437.1549B. doi:10.1093/mnras/stt1987.
^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.
^Davies, B.; Figer, D. F.; Kudritzki, R. P.; MacKenty, J.; Najarro, F.; Herrero, A. (2007). "A Massive Cluster of Red Supergiants at the Base of the Scutum‐Crux Arm". The Astrophysical Journal. 671 (1): 781–801. arXiv:0708.0821. Bibcode:2007ApJ...671..781D. doi:10.1086/522224. S2CID 1447781.
^Negueruela, I.; González-Fernández, C.; Marco, A.; Clark, J. S.; Martínez-Núñez, S. (2010). "Another cluster of red supergiants close to RSGC1". Astronomy and Astrophysics. 513: A74. arXiv:1002.1823. Bibcode:2010A&A...513A..74N. doi:10.1051/0004-6361/200913373. S2CID 118531372.
scutum, centaurus, also, known, scutum, crux, long, diffuse, curving, streamer, stars, dust, that, spirals, outward, from, proximate, milky, central, milky, been, posited, since, 1950s, have, four, spiral, arms, numerous, studies, contest, nuance, this, number. The Scutum Centaurus Arm also known as Scutum Crux arm is a long diffuse curving streamer of stars gas and dust that spirals outward from the proximate end of the Milky Way s central bar The Milky Way has been posited since the 1950s to have four spiral arms numerous studies contest or nuance this number 1 In 2008 observations using the Spitzer Space Telescope failed to show the expected density of red clump giants in the direction of the Sagittarius and Norma arms 2 In January 2014 a 12 year study into the distribution and lifespan of massive stars 3 and a 2013 reporting study of the distribution of masers and open clusters 4 both found corroboratory though would not state irrefutable evidence for four principal spiral arms Observed structure of the Milky Way s spiral arms The Scutum Centaurus Arm lies between the minor Carina Sagittarius Arm and the major Perseus Arm The Scutum Centaurus Arm starts near the core as the Scutum Arm then gradually turns into the Centaurus Arm 5 The region where the Scutum Centaurus Arm connects to the bar of the galaxy is rich in star forming regions and open clusters In 2006 a large cluster of new stars containing 14 red supergiant stars was discovered there and named RSGC1 In 2007 a cluster of approximately 50 000 newly formed stars named RSGC2 was located only a few hundred light years from RSGC1 It is thought to be less than 20 million years old and contains 26 red supergiant stars the largest grouping of such stars known 6 Other clusters in this region include RSGC3 and Alicante 8 7 See also editGalactic discReferences edit Bash F N 1981 Does the Galaxy have four spiral arms The Astrophysical Journal 250 551 Bibcode 1981ApJ 250 551B doi 10 1086 159401 Churchwell E et al 2009 The Spitzer GLIMPSE surveys a new view of the Milky Way Publications of the Astronomical Society of the Pacific 121 877 213 Bibcode 2009PASP 121 213C doi 10 1086 597811 Urquhart J S Figura C C Moore T J T Hoare M G Lumsden S L Mottram J C Thompson M A Oudmaijer R D 2013 The RMS survey Galactic distribution of massive star formation Monthly Notices of the Royal Astronomical Society 437 2 1791 arXiv 1310 4758 Bibcode 2014MNRAS 437 1791U doi 10 1093 mnras stt2006 Bobylev V V Bajkova A T 2013 The Milky Way spiral structure parameters from data on masers and selected open clusters Monthly Notices of the Royal Astronomical Society 437 2 1549 arXiv 1310 3974 Bibcode 2014MNRAS 437 1549B doi 10 1093 mnras stt1987 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 Davies B Figer D F Kudritzki R P MacKenty J Najarro F Herrero A 2007 A Massive Cluster of Red Supergiants at the Base of the Scutum Crux Arm The Astrophysical Journal 671 1 781 801 arXiv 0708 0821 Bibcode 2007ApJ 671 781D doi 10 1086 522224 S2CID 1447781 Negueruela I Gonzalez Fernandez C Marco A Clark J S Martinez Nunez S 2010 Another cluster of red supergiants close to RSGC1 Astronomy and Astrophysics 513 A74 arXiv 1002 1823 Bibcode 2010A amp A 513A 74N doi 10 1051 0004 6361 200913373 S2CID 118531372 Portals nbsp Stars nbsp Spaceflight nbsp Outer space nbsp Solar System Retrieved from https en wikipedia org w index php title Scutum Centaurus Arm amp oldid 1194993389, wikipedia, wiki, book, books, library,
