KBC Void

The KBC Void, named after astronomers Ryan Keenan, Amy Barger, and Lennox Cowie who first inferred its existence in 2013,[1] is an immense, comparatively empty region of space that contains the Milky Way itself, the Local Group and much of the Laniakea Supercluster. This void is roughly spherical, approximately 2 billion light-years (600 megaparsecs (Mpc)) in diameter, with the Milky Way within a few hundred million light-years of its centre.[2] The KBC Void is the largest supervoid known to science. The void has been used to explain the discrepancy between measurements of the Hubble constant using galactic supernovae and Cepheid variables (72–75 km/s/Mpc) and from the cosmic microwave background and baryon acoustic oscillation data (67–68 km/s/Mpc). Galaxies inside the void experience gravitational pull from matter outside the void, yielding a larger value for the Hubble constant.

See also

References

  1. ↑ Keenan, Ryan C.; Barger, Amy J.; Cowie, Lennox L. (2013). "Evidence for a ~300 Mpc Scale Under-density in the Local Galaxy Distribution". The Astrophysical Journal. 775. arXiv:1304.2884. Bibcode:2013ApJ...775...62K. doi:10.1088/0004-637X/775/1/62.
  2. ↑ Siegel, Ethan. "We're Way Below Average! Astronomers Say Milky Way Resides In A Great Cosmic Void". Forbes. Retrieved 2017-06-09.

Further reading

  • Hoscheit, Benjamin L.; Barger, Amy J. (2018-02-09). "The KBC Void: Consistency with Supernovae Type Ia and the Kinematic SZ Effect in a ΛLTB Model". The Astrophysical Journal. 854 (1). arXiv:1801.01890. doi:10.3847/1538-4357/aaa59b.


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