Astronomy:G-Cloud

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Short description: Interstellar cloud located next to the Local Interstellar Cloud
G-Cloud
Interstellar cloud
The Local Interstellar Cloud and neighboring G-cloud complex.svg
The G-Cloud complex and neighboring Local Interstellar Cloud
Observation data
DesignationsG Cloud[1]
See also: Lists of nebulae

The Galactic (G) cloud or G cloud,[2] also known as the G-Cloud (or G-Cloud complex) is an interstellar cloud located next to the Local Interstellar Cloud, within the Local Bubble. It is unknown whether the Solar System is embedded in the Local Interstellar Cloud or in the region where the two clouds are interacting, although the Solar System is currently moving towards the G-Cloud. The G-Cloud contains the stars Alpha Centauri (a triple star system that includes Proxima Centauri) and Altair (and possibly others).[3][4][5][6][7][8]

Estimates for the n(H I) particle density in the direction of Alpha Centauri. were made in 2011 by Crawford[9] as 0.1 cm−3 and in 2014 by Gry[10] as 0.098 cm−3.

References

  1. ↑ "NAME G Cloud". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NAME+G+Cloud. 
  2. ↑ Swaczyna, Paweł; Schwadron, Nathan A.; Möbius, Eberhard; Bzowski, Maciej; Frisch, Priscilla C.; Linsky, Jeffrey L.; McComas, David J.; Rahmanifard, Fatemeh et al. (2022-10-01). "Mixing Interstellar Clouds Surrounding the Sun". The Astrophysical Journal Letters 937 (2): L32. doi:10.3847/2041-8213/ac9120. ISSN 2041-8205. Bibcode: 2022ApJ...937L..32S. 
  3. ↑ "Our Local Galactic Neighborhood". Interstellar.jpl.nasa.gov. http://interstellar.jpl.nasa.gov/interstellar/probe/introduction/neighborhood.html. Retrieved 7 October 2015. 
  4. ↑ Paul Gilster (1 September 2010). "Into the Interstellar Void". Centauri-dreams.org. http://www.centauri-dreams.org/?p=14203. 
  5. ↑ "The Interstellar Medium". http://jila.colorado.edu/research/astrophysics/interstellar-medium. 
  6. ↑ Seth Redfield (2009). "Physical Properties of the Local Interstellar Medium". Igpp.ucla.edu. http://www.igpp.ucla.edu/public/mkivelso/refs/PUBLICATIONS/Redfield%20LISM.pdf. 
  7. ↑ Frisch., Priscilla (3 February 2003). "Local Interstellar Matter: The Apex Cloud". The Astrophysical Journal 593 (2): 868–873. doi:10.1086/376684. Bibcode: 2003ApJ...593..868F. 
  8. ↑ "Short Sharp Science: Spacecraft probes gas cloud swaddling the solar system". Newscientist.com. 2 February 2012. https://www.newscientist.com/blogs/shortsharpscience/2012/02/spacecraft-probes-gas-cloud-sw.html. 
  9. ↑ Crawford, Ian A. (2011-04-01). "Project Icarus: A review of local interstellar medium properties of relevance for space missions to the nearest stars" (in en). Acta Astronautica 68 (7): 691–699. doi:10.1016/j.actaastro.2010.10.016. ISSN 0094-5765. Bibcode: 2011AcAau..68..691C. https://www.sciencedirect.com/science/article/pii/S0094576510003954. 
  10. ↑ Gry, Cécile; Jenkins, Edward B. (July 2014). "The interstellar cloud surrounding the Sun: a new perspective". Astronomy & Astrophysics 567: A58. doi:10.1051/0004-6361/201323342. ISSN 0004-6361. Bibcode: 2014A&A...567A..58G. http://www.aanda.org/10.1051/0004-6361/201323342. 




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