200:(high-mass star-forming regions) suggests the Local Arm appears to be an orphan segment of an arm between the Sagittarius and Perseus arms that wraps around less than a quarter of the Milky Way. The segment has a length of ~20,000 ly in length and ~3,000 ly in width, with a pitch angle of 10.1° ± 2.7° to 11.6° ± 1.8°. These results suggest the Local Arm is larger than previously thought, and both its pitch angle and star formation rate are comparable to those of the Galaxy’s major spiral arms. The Local Arm is reasonably referred to as the fifth feature in the Milky Way.
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more-evolved objects than the gas in HMSFRs tracing the Local Arm. Investigations have been carried out to compare both the stellar density and gas distribution along the Local Arm. Researchers have found a marginally significant arm-like stellar overdensity close to the Local Arm, identified with the HMSFRs, especially in the region of 90° ≤ l ≤ 190°.
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gas-defined and stellar arm. These differences in pitch angles and offsets between the stellar and HMSFR-defined spiral arms are consistent with the expectation that star formation lags behind gas compression in a spiral density wave that lasts longer than the typical star formation timescale of 10 − 10 years.
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The researchers have concluded that the Local Arm segment is associated only with gas and star-forming clouds, showing a significant overdensity of stars. They have also found that the pitch angle of the stellar arm is slightly larger than the gas-defined arm, and there is an offset between the
208:
To understand the form of the Local Arm between the
Sagittarius and Perseus arms, the stellar density of a specific population of stars with about 1 Gyr of age between 90° ≤ l ≤ 270° have been mapped using the Gaia DR2. The 1 Gyr population have been employed because they are significantly
829:
Reid, M. J.; Menten, K. M.; Brunthaler, A.; Zheng, X. W.; Dame, T. M.; Xu, Y.; Li, J.; Sakai, N.; Wu, Y.; Immer, K.; Zhang, B.; Sanna, A.; Moscadelli, L.; Rygl, K. L. J.; Bartkiewicz, A.; Hu, B.; Quiroga-Nuñez, L. H.; Van
Langevelde, H. J. (2019).
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Scientists once believed the Orion arm to be a minor structure, namely a "spur" between Carina-Sagittarius and
Perseus, but evidence presented in 2013 suggests the Orion Arm to be a branch of the Perseus Arm or possibly an independent arm segment.
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Xu, Y.; Li, J. J.; Reid, M. J.; Menten, K. M.; Zheng, X. W.; Brunthaler, A.; Moscadelli, L.; Dame, T. M.; Zhang, B. (30 April 2013). "On the Nature of the Local Spiral Arm of the Milky Way".
602:
Xu, Ye; Reid, Mark; Dame, Thomas; Menten, Karl; Sakai, Nobuyuki; Li, Jingjing; Brunthaler, Andreas; Moscadelli, Luca; Zhang, Bo; Zheng, Xingwu (28 September 2016).
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Miyachi, Yusuke; Sakai, Nobuyuki; Kawata, Daisuke; Baba, Junichi; Honma, Mareki; Matsunaga, Noriyuki; Fujisawa, Kenta (2019).
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This article is about the galactic arm of the Milky Way Galaxy. For the stars which form the arm of the Orion asterism, see
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Xu, Y.; Reid, M.; Dame, T.; Menten, K.; Sakai, N.; Li, J.; Brunthaler, A.; Moscadelli, L.; Zhang, B.; Zheng, X. (2016).
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73:) in width and extending roughly 20,000 light-years (6,100 parsecs) in length. This galactic structure encompasses the
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The Solar System is close to its inner rim, about halfway along the arm's length, in a relative cavity in the arm's
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Shen, Juntai; Zheng, Xing-Wu (October 2020). "The bar and spiral arms in the Milky Way: structure and kinematics".
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Hirota, Tomoya; Nagayama, Takumi; Honma, Mareki; et al. (August 2020). "The First VERA Astrometry
Catalog".
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of the Sun. Their measurement has accuracy above ±10% and even 3%. The accurate locations of
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832:"Trigonometric Parallaxes of High-mass Star-forming Regions: Our View of the Milky Way"
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A rough artist's depiction of the Orion Arm within the Milky Way, with features marked.
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Reid, Mark; Zheng, Xing-Wu (April 2020). "New View of the Milky Way".
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Minor spiral arm of the Milky Way galaxy; contains the Solar System
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See the "Spiral Arms" part of this NASA animation for details
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diagram, showing the Sun's location on the Orion Spur
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The nearest nebulae and star clusters (clickable map)
672:, National Radio Astronomy Observatory, 3 June 2013.
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931:"Stellar Overdensity in the Local Arm in Gaia DR2"
894:Publications of the Astronomical Society of Japan
141:, the local portion of which projects toward the
670:Earth's Milky Way Neighborhood Gets More Respect
188:in high-mass, star-forming regions within a few
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719:"The local spiral structure of the Milky Way"
604:"The local spiral structure of the Milky Way"
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435:Orion and neighboring arms (clickable map)
403:around the Sun inside the Orion-Cygnus Arm
85:, and it was previously identified as the
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1193:) may be read as "within" or "part of".
1037:Messier Objects in the Milky Way (SEDS)
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45:Figure 1.The observed structure of the
990:Research in Astronomy and Astrophysics
570:List of nearest stars and brown dwarfs
178:Bar and Spiral Structure Legacy Survey
1255:History of the center of the Universe
137:The Orion arm is located between the
126:
7:
221:The Orion Arm contains a number of
125:) are found within it, as shown on
61:, is a minor spiral arm within the
25:
1265:Pisces–Cetus Supercluster Complex
696:10.1038/scientificamerican0420-28
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1907:
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1042:A 3D map of the Milky Way Galaxy
1:
1832:Andromeda–Milky Way collision
184:(6.7-GHz) and water (22-GHz)
176:Recently, the BeSSeL Survey (
36:Arm of Orion (disambiguation)
1020:10.1088/1674-4527/20/10/159
127:Orion Arm's interactive map
105:The arm is named after the
1985:
816:10.1088/0004-637X/769/1/15
29:
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935:The Astrophysical Journal
836:The Astrophysical Journal
786:The Astrophysical Journal
1104:Local Interstellar Cloud
966:10.3847/1538-4357/ab2f86
867:10.3847/1538-4357/ab4a11
1464:Supermassive black hole
565:List of Messier objects
547:used as background for
1752:Sagittarius Spheroidal
1614:Small Magellanic Cloud
1609:Large Magellanic Cloud
1566:Pisces-Eridanus stream
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1216:To the Moon and Beyond
753:10.1126/sciadv.1600878
638:10.1126/sciadv.1600878
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359:Little Dumbbell Nebula
139:Carina–Sagittarius Arm
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34:. For other uses, see
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1234:(1968 and 1977 films)
1164:Laniakea Supercluster
518:
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391:
117:, the three stars of
101:Naming and brightness
44:
32:Orion (constellation)
1423:The Milky Way Galaxy
916:10.1093/pasj/psaa018
57:, also known as the
1397:Observable universe
1178:Observable universe
1012:2020RAA....20..159S
957:2019ApJ...882...48M
858:2019ApJ...885..131R
808:2013ApJ...769...15X
745:2016SciA....2E0878X
684:Scientific American
630:2016SciA....2E0878X
194:interstellar masers
158:interstellar medium
107:Orion Constellation
1964:Galactic astronomy
1737:Pisces Overdensity
1571:Sagittarius Stream
1482:Carina–Sagittarius
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1377:Virgo Supercluster
1358:Milky Way subgroup
1260:Order of magnitude
1242:(1996 documentary)
1158:Virgo Supercluster
1139:Milky Way subgroup
545:Milky Way painting
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365:Diffuse Nebula M78
301:De Mairan's Nebula
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1847:Zone of Avoidance
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1662:Canes Venatici II
1619:Magellanic Bridge
1601:Magellanic Clouds
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1550:Magellanic Stream
1535:Fimbulthul stream
1305:
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1078:Location of Earth
232:Butterfly Cluster
16:(Redirected from
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331:Open Cluster M48
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321:Open Cluster M46
288:Open Cluster M41
277:Open Cluster M39
272:Open Cluster M35
267:Open Cluster M34
262:Open Cluster M29
250:Open Cluster M25
245:Open Cluster M23
63:Milky Way Galaxy
59:Orion–Cygnus Arm
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239:Ptolemy Cluster
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160:, known as the
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1240:Cosmic Voyage
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1232:Powers of Ten
1229:
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668:Dave Finley,
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631:
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583:
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566:
563:
561:
560:Loop I Bubble
558:
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546:
542:
539:
537:
534:
532:
531:Galactic disc
529:
528:
523:
407:
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37:
33:
19:
1926:Solar System
1842:In mythology
1782:Ursa Major I
1747:Reticulum II
1576:Virgo Stream
1545:Helmi stream
1540:Gaia Sausage
1492:Orion–Cygnus
1491:
1487:Norma–Cygnus
1408:Each arrow (
1296:Space portal
1289:
1277:
1247:
1239:
1231:
1223:
1215:
1207:
1189:Each arrow (
1124:
1111:Local Bubble
1097:Solar System
993:
989:
983:
938:
934:
924:
897:
893:
839:
835:
824:
789:
785:
779:
726:
722:
712:
687:
683:
677:
664:
611:
607:
597:
585:
555:Local Bubble
294:Orion Nebula
220:
211:
207:
175:
162:Local Bubble
155:
151:
136:
123:Orion Nebula
119:Orion's Belt
104:
90:
86:
83:Orion Bridge
82:
78:
75:Solar System
58:
54:
52:
1914:Spaceflight
1692:Eridanus II
1667:Canis Major
1371:Local Sheet
1365:Local Group
1226:(1968 film)
1224:Cosmic Zoom
1218:(1964 film)
1210:(1957 book)
1208:Cosmic View
1152:Local Sheet
1146:Local Group
996:(10): 159.
541:Jon Lomberg
342:Ring Nebula
190:kiloparsecs
172:Composition
147:Perseus Arm
67:light-years
1948:Categories
1797:Ursa Minor
1652:Boötes III
1390:Local Hole
1248:Cosmic Eye
1171:Local Hole
1118:Gould Belt
1003:2012.10130
948:1907.03763
907:2002.03089
849:1910.03357
842:(2): 131.
736:1610.00242
621:1610.00242
577:References
536:Gould Belt
376:Owl Nebula
282:Winnecke 4
145:, and the
121:, and the
111:Betelgeuse
95:Cygnus Arm
91:Orion Spur
87:Local Spur
1807:Willman 1
1742:Pisces II
1647:Boötes II
1637:Antlia II
1590:Satellite
1560:Palomar 5
1431:Structure
1351:Milky Way
1339:Milky Way
1132:Milky Way
1125:Orion Arm
975:195847953
941:(1): 48.
876:203904869
799:1304.0526
792:(1): 15.
690:(4): 28.
79:Local Arm
55:Orion Arm
47:Milky Way
1875:Category
1767:Sculptor
1702:Hercules
1682:Crater 2
1642:Boötes I
1592:galaxies
1404:Universe
1346:Location
1185:Universe
1085:Included
771:27704048
704:39014607
656:27704048
524:See also
315:Pleiades
182:methanol
133:Location
1938:Science
1888:Portals
1820:Related
1802:Virgo I
1772:Sextans
1762:Segue 2
1757:Segue 1
1732:Phoenix
1497:Perseus
1200:Related
1008:Bibcode
953:Bibcode
854:Bibcode
804:Bibcode
762:5040477
741:Bibcode
647:5040477
626:Bibcode
89:or the
71:parsecs
69:(1,100
1717:Leo IV
1712:Leo II
1697:Fornax
1672:Carina
1629:Dwarfs
1562:stream
1399:
1392:
1385:
1360:
1353:
1250:(2012)
1180:
1173:
1166:
1141:
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1120:
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1106:
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874:
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654:
644:
198:HMSFRs
186:masers
1902:Stars
1727:Leo T
1722:Leo V
1707:Leo I
1687:Draco
1090:Earth
998:arXiv
971:S2CID
943:arXiv
902:arXiv
900:(4).
872:S2CID
844:arXiv
794:arXiv
731:arXiv
616:arXiv
378:(M97)
361:(M76)
344:(M57)
317:(M45)
310:(M44)
303:(M43)
296:(M42)
284:(M40)
258:(M27)
115:Rigel
1522:Halo
1474:Disk
767:PMID
700:PMID
652:PMID
384:Maps
374:The
357:The
340:The
313:The
306:The
299:The
292:The
254:The
241:(M7)
237:The
234:(M6)
230:The
204:Form
53:The
1016:doi
961:doi
939:882
912:doi
862:doi
840:885
812:doi
790:769
757:PMC
749:doi
692:doi
688:322
642:PMC
634:doi
543:'s
353:M73
196:in
81:or
1950::
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225::
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129:.
113:,
97:.
1890::
1410:→
1401:→
1394:→
1387:→
1380:→
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1368:→
1362:→
1355:→
1331:e
1324:t
1317:v
1191:→
1182:→
1175:→
1168:→
1161:→
1155:→
1149:→
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1136:→
1129:→
1122:→
1115:→
1108:→
1101:→
1094:→
1070:e
1063:t
1056:v
1022:.
1018::
1010::
1000::
977:.
963::
955::
945::
918:.
914::
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864::
856::
846::
818:.
814::
806::
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773:.
751::
743::
733::
727:2
706:.
694::
658:.
636::
628::
618::
612:2
592:.
38:.
20:)
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