आकाशगंगा

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आकाशगंगा
ESO-VLT-Laser-phot-33a-07.jpg
The Milky Way's Galactic Center in the
night sky above Paranal Observatory
(the laser creates a guide-star for the telescope).
निरेखन आँकड़ा
प्रकार Sb, Sbc, or SB(rs)bc[1][2] (barred spiral galaxy)
व्यास 100–180 kly (31–55 kpc)[3]
बीरर डिस्क के मोटाई ≈2 kly (0.6 kpc)[4][5]
तारा सभ के संख्या 200–400 billion (3×1011 ±1×1011)[6][7][8]
सभसे पुरान तारा ≥13.7 Gyr[9]
द्रब्यमान 0.8–1.5×1012 M[10][11]
कोणीय वेग1×1067 J s[12]
सूरज से गैलेक्सी सेंटर के दूरी 27.2 ± 1.1 kly (8.34 ± 0.34 kpc)[13]
Sun's Galactic rotation period 240 Myr[14]
Spiral pattern rotation period 220–360 Myr[15]
Bar pattern rotation period 100–120 Myr[15]
Speed relative to CMB rest frame 552 ± 6 km/s[16]
Escape velocity at Sun's position 550 km/s[17]
Dark matter density at Sun's position 0.0088+0.0024
-0.0018
Mpc-3 or 0.35+0.08
-0.07
GeV cm-3[17]
See also: Galaxy, List of galaxies

आकाशगंगा या मंदाकिनी या मिल्की वे (अंगरेजी: Milk yway) एगो गैलेक्सी बा जौना में हमनी के सौरमंडल स्थित बाटे। ई एगो स्पाइरल गैलेक्सी हवे जेवना कि बिचली बाँही में हमनी के सौरमंडल बाटे।

संदर्भ[संपादन]

  1. Gerhard, O. (2002). "Mass distribution in our Galaxy". Space Science Reviews. 100 (1/4): 129–138. arXiv:astro-ph/0203110. Bibcode:2002SSRv..100..129G. doi:10.1023/A:1015818111633.
  2. Frommert, Hartmut; Kronberg, Christine (August 26, 2005). "Classification of the Milky Way Galaxy". SEDS. पहुँचतिथी 2015-05-30.
  3. Hall, Shannon (2015-05-04). "Size of the Milky Way Upgraded, Solving Galaxy Puzzle". Space.com. पहुँचतिथी 2015-06-09.
  4. Coffey, Jeffrey. "How big is the Milky Way?". Universe Today. ओरिजनल से September 24, 2013 के पुरालेखित. पहुँचतिथी November 28, 2007.
  5. Rix, Hans-Walter; Bovy, Jo (2013). "The Milky Way's Stellar Disk". The Astronomy and Astrophysics Review. 21. arXiv:1301.3168. Bibcode:2013A&ARv..21...61R. doi:10.1007/s00159-013-0061-8.
  6. "NASA – Galaxy". NASA and World Book. Nasa.gov. November 29, 2007. ओरिजनल से April 12, 2009 के पुरालेखित. पहुँचतिथी December 6, 2012.
  7. Staff (December 16, 2008). "How Many Stars are in the Milky Way?". Universe Today. May 2, 2010 के ओरिजनल से पुरालेखित. पहुँचतिथी August 10, 2010.
  8. Odenwald, S. (March 17, 2014). "Counting the Stars in the Milky Way". The Huffington Post. August 1, 2014 के ओरिजनल से पुरालेखित. पहुँचतिथी June 9, 2014.
  9. H.E. Bond; E. P. Nelan; D. A. VandenBerg; G. H. Schaefer; आ अन्य. (February 13, 2013). "HD 140283: A Star in the Solar Neighborhood that Formed Shortly After the Big Bang". The Astrophysical Journal. 765 (1): L12. arXiv:1302.3180. Bibcode:2013ApJ...765L..12B. doi:10.1088/2041-8205/765/1/L12.
  10. McMillan, P. J. (July 2011). "Mass models of the Milky Way". Monthly Notices of the Royal Astronomical Society. 414 (3): 2446–2457. arXiv:1102.4340. Bibcode:2011MNRAS.414.2446M. doi:10.1111/j.1365-2966.2011.18564.x.
  11. Kafle, P.R.; Sharma, S.; Lewis, G.F.; Bland-Hawthorn, J. (2012). "Kinematics of the Stellar Halo and the Mass Distribution of the Milky Way Using Blue Horizontal Branch Stars". The Astrophysical Journal. 761 (2): 17. arXiv:1210.7527. Bibcode:2012ApJ...761...98K. doi:10.1088/0004-637X/761/2/98.
  12. Karachentsev, Igor. "Double Galaxies §7.1". ned.ipac.caltech.edu. Izdatel'stvo Nauka. पहुँचतिथी 5 अप्रैल 2015.
  13. Gillessen, S.; आ अन्य. (2009). "Monitoring stellar orbits around the massive black hole in the Galactic Center". Astrophysical Journal. 692 (2): 1075–1109. arXiv:0810.4674. Bibcode:2009ApJ...692.1075G. doi:10.1088/0004-637X/692/2/1075.
  14. Sparke, Linda S.; Gallagher, John S. (2007). Galaxies in the Universe: An Introduction. प. 90. ISBN 9781139462389.
  15. 15.0 15.1 Gerhard, O. "Pattern speeds in the Milky Way". arXiv:1003.2489v1.
  16. Kogut, A.; आ अन्य. (1993). "Dipole anisotropy in the COBE differential microwave radiometers first-year sky maps". The Astrophysical Journal. 419: 1. arXiv:astro-ph/9312056. Bibcode:1993ApJ...419....1K. doi:10.1086/173453.
  17. 17.0 17.1 Kafle, P.R.; Sharma, S.; Lewis, G.F.; Bland-Hawthorn, J. (2014). "On the Shoulders of Giants: Properties of the Stellar Halo and the Milky Way Mass Distribution". The Astrophysical Journal. 794 (1): 17. arXiv:1408.1787. Bibcode:2014ApJ...794...59K. doi:10.1088/0004-637X/794/1/59.