Dark siren
A dark siren is a gravitational wave event which is being used by astronomers to establish the Hubble constant.[1] It is caused by the merger of two black holes or two neutron stars. The collision of two such objects creates distortions in space-time which propagate as waves through space. These events are fairly rare in the universe, and must be detected by multiple gravitational wave telescopes in order to be valuable for scientists.
A dark siren is an alternate form of a standard siren, an interstellar measurement of "loudness" of gravitational waves (analogous to sound waves). In 2017 the neutron star merger GW170817 resulted in a dark siren that produced a Hubble parameter of 73.3+5.3
−5.0 (km/s)/Mpc.[2] A similar event resulting from the binary black hole merger GW170814, also in 2017, resulted in a value of 75+40
−32 (km/s)/Mpc.[3]
References[]
- ^ Mann, Adam (2021-04-09). "'Dark sirens' could solve one of the greatest mysteries in cosmology". livescience.com. Retrieved 2021-09-30.
- ^ Hotokezaka, K.; et al. (8 July 2019). "A Hubble constant measurement from superluminal motion of the jet in GW170817". Nature Astronomy. 3 (10): 940–944. arXiv:1806.10596. Bibcode:2019NatAs...3..940H. doi:10.1038/s41550-019-0820-1. S2CID 119547153.
- ^ "First Measurement of the Hubble Constant from a Dark Standard Siren using the Dark Energy Survey Galaxies and the LIGO/Virgo Binary–Black-hole Merger GW170814". The Astrophysical Journal Letters. 876 (1).
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